Page 1 Internal Use Only Service Manual KT520 Date: June, 2008 / Issue 1.0...
Page 2: Table Of Contents
4.9 Folder ON/OFF Trouble ......98 4.10 Audio Trouble Shooting .....100 4.11 Charger Trouble Shooting....115 4.12 Checking Bluetooth Block ....118 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 3 - Only for training and service purposes...
Page 4: Introduction
The user may not make any changes and/or repairs expect as specifically noted in this manual. Therefore, note that unauthorized alternations or repair may affect the regulatory status of the system and may void any remaining warranty. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 5 -...
Page 5 • When returning system boards or parts like EEPROM to the factory, use the protective package as described. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 6 - Only for training and service purposes...
Page 6: Performance
Push Type ( + , - ) Voice Key Push Type External Memory T - Flash Socket I/O Connect 18 Pin Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 7 - Only for training and service purposes...
Page 7: Usable Environment
°C Humidity max. 85 2) Environment (Accessory) Item Spec. Typ. Unit Power Available power * CLA : 12~24V(DC). LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 8 - Only for training and service purposes...
Page 8: Radio Performance
-59dBm 915M~1GHz -57dBm 915M~1GHz -57dBm 1G~1.71GHz -47dBm 1G 1.71GHz -47dBm 1.71G~1.785GHz -53dBm 1.71G~1.785GHz -53dBm 1.785G~4GHz -47dBm 1.785G~4GHz -47dBm Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 9 - Only for training and service purposes...
Page 9 Intermodulation attenuation Frequency offset 800kHz Intermodulation product should be Less than 55dB below the level of Wanted signal LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 10 - Only for training and service purposes...
Page 10 ±4 ±3 ±4 ±5 ±4 ±5 ±4 ±5 ±4 ±5 ±5 ±5 Burst timing Mask IN Mask IN Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 11 - Only for training and service purposes...
Page 11 Occupied Bandwidth(OBW) 5MHz(99%) Spectrum emission Mask -35-15*(∆f-2.5)dBc@∆f=2.5~3.5MHz,30k -35-1*(∆f-3.5)dBc@∆f=3.5~7.5MHz,1M -39-10*(∆f-7.5)dBc@∆f=7.5~8.5MHz,1M -49dBc@∆f=8.5~12.5MHz,1M Adjacent Channel Leakage Ratio(ACLR) 33dB@5MHz, ACP>-50dBm 43dB@10MHz, ACP>-50dBm LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 12 - Only for training and service purposes...
Page 12 -31dBc@5MHz, Interferer -40dBc -41dBc@10MHz, Interferer -40dBc Error Vector Magnitude (EVM) 17.5%(>-20dBm) (@12.2K, 1DPDCH+1DPCCH) Transmit OFF Power -15dB@SF=4, 768kbps, multi-code transmission Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 13 - Only for training and service purposes...
Page 13 Wanted Signal: -101dBm Wanted Signal: -101dBm (TCH/FS Class II, RBER) Unwanted Signal: Unwanted Signal: Depend on freq. Depend on freq. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 14 - Only for training and service purposes...
Page 14 -46dBm CW@10MHz & -46dBm/3.84MHz@20MHz UE@+20dBm output power(class3) -57dBm@f=9KHz~1GHz, 100k BW Spurious Emissions -47dBm@f=1~12.75GHz, 1M -60dBm@f=1920~1980MHz, 3.84MHz -60dBm@f=2110~2170MHz, 3.84MHz Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 15 - Only for training and service purposes...
Page 15 Out of Band Spurious Emissions Freq.Range Operating Standby 30MHz~1GHz -36dBm -57dBm Above 1GHz~ -30dBm -47dBm 12.75GHz 1.8~1.9GHz -47dBm -47dBm 5.15~5.3GHz -47dBm -47dBm LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 16 - Only for training and service purposes...
Page 16 Intermodluation Performance static sinwave signal at f1=-39dBm a BT modulated signal f2=-39dBm(payload PRBS15) BER ≤ 0.1%@-20dBm Maximum Input Level Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 17 - Only for training and service purposes...
Page 17: Current Consumption
3.52 ± 0.05V BAR 1 (3%) -> Icon 3.4 ± 0.05V Blinking&Alerting Sound POWER OFF 3.2 ± 0.05V LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 18 - Only for training and service purposes...
Page 18: Sound Pressure Level
Receiving Distortion (RD) refer to TABLE 30.4 Idle Noise-Sending (INS) -55dBm0p under -45dBPA under Idle Noise-Receiving (INR) -40dBPA under Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 19 - Only for training and service purposes...
Page 19: Charging
(GSM: It should be kept 3.7V in all power level WCDMA: It will not be kept 3.7V in some power level) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 20 - Only for training and service purposes...
Page 20: Technical Brief
Internal Random Access Memory (IRAM) in the EGG core through the AHB. The AHB slave interface allows the CPU and the DMA to access in the program and data RAM residing in the DSPSUB. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 21 -...
Page 21 - External Memory Interface that supports NAND, NOR, PSRAM, SDRAM - JTAG - RTC - ETM (in Prototype Package) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 22 - Only for training and service purposes...
Page 22 Digital Baseband Processor <3 Mega> (Dual core) <Optical <USB Joystick> Transceiver> <Bluetooth > Figure 3-1-1 KT520 Block Diagram Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 23 - Only for training and service purposes...
Page 23 NAND flash K5D1G12ACB-D075 Samsung Erase speed 2ms 1 Block = 16K Byte 8MByte/s Table 3- 1- 1. External Memory Interface Spec. of KT520 Figure 3- 1- 2. External Memory Configuration of KT520 • Data Communication • Package - IrDA ® (SIR) - 12 by 12 mm 344 balls, 0.5mm pitch...
Page 24 3. TECHNICAL BRIEF 3.1.3 Hardware Architecture A. Block Diagram Figure 3-1-3. Access system of Ericsson DB3150 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 25 - Only for training and service purposes...
Page 25 3. TECHNICAL BRIEF Figure 3-1-4. Application system of Ericsson DB3150 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 26 - Only for training and service purposes...
Page 26 The functional blocks of the Peripheral subsystem connect to the peripheral bus through four separate bridges, which provide a simple interface to support different timing and memory access arrangements. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 27 -...
Page 27 Individual blocks can also be reset and their clocks held inactive by accessing the appropriate control registers. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 28 - Only for training and service purposes...
Page 28 WRX_Q_P DAC_I_NEG WTX_I_N DAC_I_POS WTX_I_P DAC_Q_NEG WTX_Q_N DAC_Q_POS WTX_Q_P TX_POW WPOW_DET Figure 3-1-6. Schematic of WCDMA RF Interface Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 29 - Only for training and service purposes...
Page 29 ACC Transmit Data UART1 APP_GPIO_0 APP_GP00_UART_RX APP Receive Data APP_GPIO_1 APP_GP01_UART_TX APP Transmit Data Table 3-1-3. UART Interface LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 30 - Only for training and service purposes...
Page 30 ACC_GPIO_21 ACC_GP25_BT_SPI_DAT1 Input ACC_GPIO_22 ACC_GP26_BT_SPI_CLK Output low ACC_GPIO_23 ACC_GP27_AMP_SW_EN Output low Table 3-1-4. DB3150 ACC GPIO Map Table Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 31 - Only for training and service purposes...
Page 31 Output Low (Hi-Z : low) APP_GPIO_13 ACC_GP15_CAM_LDO_CTRL Output low APP_GPIO_14 Output low Table 3-1-5. DB3150 APP GPIO Map Table LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 32 - Only for training and service purposes...
Page 32 USB_CS_PD USB chip select VBUS Power supply for Asta USB block Table 3-1-6. USB Signal Interface of DB3150 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 33 - Only for training and service purposes...
Page 33 PSW_N R417 ACC_GP00_USB_STP VBUS VBUS_USB_TRX ACC_GP01_USB_DIR REG3V3 CFG0 XTAL1 USB_XTAL1 REF1V8 XTAL2 Figure 3-1-9. Schematic of USB Transceiver LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 34 - Only for training and service purposes...
Page 34 U502 TK60012BM5 IO_VDD GND1 GND2 C525 0.1u APP_GP03_FLIPSENSE C526 0.1u HALL EFFECT SWITCH Figure 3-1-10. Slider On/Off Detector Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 35 - Only for training and service purposes...
Page 35 3. TECHNICAL BRIEF 3.1.10 Bluetooth Interface KT520 supports Bluetooth operation using ST’s STLC2500C Bluetooth module. A. General Description The Bluetooth interface utilizes the SPI interface for control signals going to and from the Bluetooth module. The SPI is also used for data transmissions.
Page 36 ■ Faster Connection: Interlaced scan for Page and Inquiry scan, first FHS without random back off, RSSI used to limit range ■ Extended SCO (eSCO) links Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 37 -...
Page 37 - External interrupts possible through the GPIOs - Fast master I2C interface ■ Efficient and flexible support for WLAN coexistence in collocated scenario LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 38 - Only for training and service purposes...
Page 38 - HCI interface between DB3150 and STLC2500C • PCM - Audio signal interface between DB3150/AB3000 and STLC2500C • ANT - 2.4GHz, 50 ohm matching Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 39 -...
Page 39 3. TECHNICAL BRIEF 3.1.11 MicroSD Interface card KT520 supports the MicroSD card interface as external memory card. MicroSD card has 4-data line, so KT520 uses 4-data lines. All control and data lines are connected to DB3150. Cause of the difference between DB3150 and MicroSD card, a level shifter should be added.
Page 40 Power for DB3150 Press END key PWRRSTn PWRRST RESPOW_N IRQ0n IRQ0_N ONSWAn ONSWA Figure 3-1-13. Power On Sequence Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 41 - Only for training and service purposes...
Page 41 KEYOUT3 KB_STAR KB511 R642 KEYOUT4 R643 KEY PAD AND SIDE KEY PAD Figure 3-1-14. MAIN PCB KeyPad Circuit LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 42 - Only for training and service purposes...
Page 42 RIGHT KEYOUT2 DOWN CANCEL KEYOUT3 CALL ONSWA_n KEYOUT4 OJ KEY PAD Figure 3-1-15. KEY PCB Key Pad Circuit Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 43 - Only for training and service purposes...
Page 43 ZD100 ESD9X5.0ST5G ESD9X5.0ST5G ESD9X5.0ST5G INSTPAR INSTPAR INSTPAR 10pin Optical Joystick Connector AXK7L10227G (0.9T socket) Figure 3-1-16. Optical Joystick LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 44 - Only for training and service purposes...
Page 44: Gam Hardware Subsystem
• GRAPHCON : graphics controller. • PDI/SSI : programmable display interface for parallel/serial displays. • CDI : camera data interface. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 45 - Only for training and service purposes...
Page 45 I/O ports. It has a 128 byte program memory, programmable by the CPU, which can store up to 64 instructions. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 46 - Only for training and service purposes...
Page 46 In this case, it must have pull-down to ground. The camera module reset signal is an output to the camera module. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 47 -...
Page 47 0.1u 0.1u 0.01u 34pin 3M CAMERA CONNECTOR AXK7L34227G (0.9T socket) Figure 3-2-3. 3M Camera Connector(34Pin °© Main Board) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 48 - Only for training and service purposes...
Page 48 APP_I2C_SDA CI_D1 TP104 CI_D2 CI_HSYNC TP105 CI_D3 CI_VSYNC CI_D4 CI_D7 CI_D5 CI_D6 Figure 3-2-5. VGA LCD FPCB Connector Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 49 - Only for training and service purposes...
Page 49 LVDD2(Driver IC) VDDIO VDDA VDDD VDDA VDDD Table 2-2-1. Interface between Main board and 2M camera (in Main) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 50 - Only for training and service purposes...
Page 50 Vdd_L 1.8V 8Bit Data[5] Vdd_H 2.8V Table 2-2-2. Interface between VGA Camera Module and FPCB (in LCD FPCB) Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 51 - Only for training and service purposes...
Page 51 3*3*1.2 0.85A 155mohm 30% VBUCK_FB L600 4.7uH SWBUCK VCORE to DB3100 CORE Figure 3-2-7. 1.5V Camera LDO in AB3000 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 52 - Only for training and service purposes...
Page 52 LCD Module is connected to Key PCB with 35-pin Connector in sub PCB. The LCD is controlled by 8-bit PDI(Parallel Data Interface) in DB3150. Table 3-2-4. Interface between LCD module and SUB PCB Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 53 -...
Page 53 Figure 3-2-8. LCD Module Block Diagram 262K TFT LCD 320 X 240 pixels Main LCD Driver IC JBT6K85 Figure 3-2-9. LCD Module(Main LCD) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 54 - Only for training and service purposes...
Page 54 REFBP LDO2 VDD_CAM_1V8 C103 C104 C105 C106 0.01u BACKLIGHT CHARGE PUMP Figure 3-2-10. Charge Pump Circuit LCD Backlight Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 55 - Only for training and service purposes...
Page 55 There are 2 side view white LEDs in Main board backlight circuit, which are driven by LED1, LED2 port from AB3000. VBAT C524 0.1u Figure 3-2-11. Keypad Backlight LED Interface and Backlight Circuit LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 56 - Only for training and service purposes...
Page 56: Audio Part
(PGA). The decoder has a receive volume control. The audio inputs and outputs can be switched to normal or auxiliary ports. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 57 - Only for training and service purposes...
Page 57 SPK_RCV_N BOOST_SW2 BOOST_SW3 ACC_GP13_SPK_AMP_EN _SHUTDOWN BOOST_FB+ VSSBOOST BYPASS C646 0.01u R625 ACC_GP27_AMP_SW_EN Figure 3-3-3 . Audio Section scheme LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 58 - Only for training and service purposes...
Page 58 MIDI Only Lo ud Speaker SPKRP/SPKRN Loud Speaker Mode SPKR/SPKN AUXO1/AUXO2 Headse t Mode Table 3-3-1. Audio Mode Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 59 - Only for training and service purposes...
Page 59 • Loud Speaker / Video Telephony Mode : AB3000 SPK Amp → SPKR/N → AUDIO AMP(TPA6205) → Speaker(8Ω) • Headset Mode : Auxiliary audio amplifier → AUXO1/2 → AUDIO AMP(TPA4411) → Head Phone LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 60 - Only for training and service purposes...
Page 60 • Headset Mode : Headset MIC → Veronica Input(AUXI1N/1P) When the headset is inserted, EAR_DETECT_n(Circuit Diagram net Name) converted into low state So, the headset icon is displayed on Main LCD. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 61 -...
Page 61 MIDI : DB3150 → PCM Decoder → Auxiliary audio amplifier → SPKRP/N Port → AUDIO AMP(TPA6205) → Speaker(8Ω) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 62 - Only for training and service purposes...
Page 62 Figure 3-3-7. MP3 Scheme MP3 function supports PCM 44/48KHz sampling rate.The PCM44/48 RX-path is intended to be used as a audio amp and one speaker. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 63 -...
Page 63 This section provides a description of the Video Telephony functions. Figure 3-3-8. Video Telephony Scheme Video Telephony Mode has same paths with Loud Speaker Mode. 3.3.8 Audio Main Component There are 4 components in KT520 schematic Diagram. Part Number marked on KT520 Schematic Diagram. ITEM ITEM...
Page 64: Gpadc(General Purpose Adc) And Autoadc2
Reference voltage for PAM GPA4 WRFLOOP Lock inform GPA6 GPA6 Headset detect GPA7 VBACKUP Backup battery Table 3-4-1. GPADC channel spec Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 65 - Only for training and service purposes...
Page 65: Charger Control
VBAT Current sensing input positive CHSENSE- Analog VBAT Current sensing input negative Table 3-5-1. Charger Control channel spec LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 66 - Only for training and service purposes...
Page 66 3. TECHNICAL BRIEF 3.5.1 Fuel Gauge AB3000 supports the measurement of the current consumption/charging current in the KT520 with a fuel gauge block. By constantly integrating the current flowing into and out of the battery, the fuel gauge block is used to determine the remaining battery capacity.
Page 67 Fig 3-5-5. Battery Temperature Measurement Name Type Unused Description BDATA Digital Input/Output Unconnected current output Table 3-5-3 BDATA channel spec LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 68 - Only for training and service purposes...
Page 68 3.52 ~3.4 (V) 3.4 ~3.2 (V) 100~40 (%) 40~12 (%) 12~3 (%) 3~0(%) Fig. 3-5-7 Battery Block Indication Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 69 - Only for training and service purposes...
Page 69 CCCV algorithm. (Fig.3-5-8) shows the charging voltage(a) and charging current change(b). (a) Charging voltage (b) Charging current Fig. 3-5-8. CCCV charging method LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 70 - Only for training and service purposes...
Page 70 • Under 0 °C : Extended temperature • From 0 °C to 45 °C : Normal charging temperature • Over 45 °C : Extended temperature Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 71 -...
Page 71: Voltage Regulation
It provides power for the 32 kHz oscillator and the real-time clock (RTC). Table. 3-6-1. LDO and Buck LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 72 - Only for training and service purposes...
Page 72: Rf Technical Description
WCDMA part, a GSM, and a RF front-end. Different from other general solutions, the RF front-end of KT520 consists of an antenna switch and an EDGE power amplifier module (PAM).
Page 73 DC/DC converter regulates the supply voltage and the bias operation point is controlled by a D/A- converter in the W-CDMA radio circuit. These DACs are controlled through the 3-wire-bus LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 74 - Only for training and service purposes...
Page 74 Once filtered, the zero IF I and Q signals are further amplified with provision of 31 x 1 dB steps and DC offset compensation. The zero IF output buffer provides close rail-to-rail outputs signal. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 75 -...
Page 75 RF_CTRL_DATA WRX_Q_N R207 RF_CTRL_CLK WRX_Q_P R208 RF_CTRL_STRB WRX_I_N R209 C230 5.6p WCLK WRX_I_P Figure 3-7-4. WCDMA Transceiver schematic LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 76 - Only for training and service purposes...
Page 76 GND1 GND2 10nH C211 C210 C212 L203 0.5p VBIAS GND1 C_OUT TERMINATE WPOW_SENSE Figure 3-7-6. WCDMA PAM schematic Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 77 - Only for training and service purposes...
Page 77 Dual Transfer Mode (DTM) class 9 (3+2=5) Zero-IF receiver • Polar modulation transmitter Figure 3-7-7. GSM Transceiver Architecture LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 78 - Only for training and service purposes...
Page 78 The digital output signals are sent over a serial interface to the digital base- band circuit for further processing and detection. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 79 -...
Page 79 W-CDMA circuit. This output is activated by a control signal in the digital bus. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 80 - Only for training and service purposes...
Page 80 The switch is used only for selecting the W-CDMA mode of operation . the split between transmit and receive frequencies is handled by the W-CDMA duplexer. Figure 3-7-8. Front-End Module Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 81 -...
Page 81 R130 L101 C648 22nH C104 C103 C102 C101 C112 C113 C105 0.01u Figure 3-7-10. Front End part schematic LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 82 - Only for training and service purposes...
Page 82 RF system is estimated by a voltage measurement performed by the analog baseband controller. The control flow for the RF system is shown in Figure 3-7-11. Figure 3-7-11. RF Control Flow Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 83 -...
Page 83: Trouble Shooting
VDDE_1V8 (C603) 1.8V VDDC_2V65(C606) 2.65V VDDF_2V5 (C608) 2.5V VDDG_2V75 (C609) 2.75V VDDK_2V75(C610) 2.75V VCORE(C616) 1.5V Change main board LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 84 - Only for training and service purposes...
Page 84: Usb Trouble
VBAT power(C408,C409) is same to battery? ACC_GP20_USB_CS_PD is 1.8V? Change main board Finish C409 C408 U402 < Main Board ñ Bottom side > Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 85 - Only for training and service purposes...
Page 85: Sim Detect Trouble
< Main Board - Bottom side > SIM works well? Finish Change SIM card SIM works well? Finish Change main board LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 86 - Only for training and service purposes...
Page 86: Microsd Card Trouble
Resolder R116 MicroSD works well? Finish S100 Change main board R116 < Sub Board - Bottom side > Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 87 - Only for training and service purposes...
Page 87: Keypad, Touch Button And Touch Screen Trouble
Check BtoB connector short? CN503(Main Bíd) CN503(Main Bíd) Keypad operates well? Change Keypad Keypad operates well? Change Main Board Finish LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 88 - Only for training and service purposes...
Page 88 KEYOUT3 CN503 KEYOUT4 Pin # 59 ~ #61 KEYIN5 KEYIN4 KEYIN3 < Main Board ñ Top side > Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 89 - Only for training and service purposes...
Page 89 Finish Change Key PCB Finish OJ key works well? Change OJ key module < OJ Key module > LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 90 - Only for training and service purposes...
Page 90: Camera Trouble
3M Cameraís Operation is OK? 34 pin 3M Camera Connector in Main Board Change Main board Change 3M Camera 3M Camera Works Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 91 - Only for training and service purposes...
Page 91 Change VGA Camera VGA Cameraís Operation OK? Change the Camera&LCD FPCB VGA Camera Works Change the Main Board LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 92 - Only for training and service purposes...
Page 92 LCD FPCB 20 pin VGA Connector (TOP side) U101 C105 C104 U101 Charge Pump in Key Board (BOTTOM side) Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 93 - Only for training and service purposes...
Page 93: Main Lcd Trouble
Change LCD FPCB or Key PCB Change LCD Module The LCD Works LCD Display OK? Change the Main Board LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 94 - Only for training and service purposes...
Page 94 Main Board 70 pin B to B Connector LCD FPCB 40 pin BtoB Connector Keyb PCB 35 pin LCD Connector (BOTTOM side) (BOTTOM side) Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 95 - Only for training and service purposes...
Page 95: Keypad Backlight Trouble
Backlights Control Signal is 2.8V at R120? Resolder or Change Q100 Keypad Backlights Works? Finish Change Main Board LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 96 - Only for training and service purposes...
Page 96 4. TROUBLE SHOOTING VBAT C107 0.1u R120 ACC_GP12_KEY_LED_ON 2.2K R129 Q100 EMX18 R131 UPPER KEY LED Q100 R120 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 97 - Only for training and service purposes...
Page 97: Folder On/Off Trouble
Place magnet on U502 Slide OK? Pin 4 of U502 = 0V Change keypad Slide OK? Finished Change Main board LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 98 - Only for training and service purposes...
Page 98 4. TROUBLE SHOOTING VDDC_2V65 VDDE_1V8 U502 TK60012BM5 IO_VDD GND1 GND2 C525 0.1u APP_GP03_FLIPSENSE C526 0.1u HALL EFFECT SWITCH U502 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 99 - Only for training and service purposes...
Page 99: Audio Trouble Shooting
Note: It is recommended that engineer should check the soldering of R, L, C along the • corresponding path before every step. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 100 - Only for training and service purposes...
Page 100 Resolder the Receiver receiver OK? Can you hear sine wave Change the Receiver out of the receiver ? Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 101 - Only for training and service purposes...
Page 101 4. TROUBLE SHOOTING R621 R618 Main PCB Bottom Pin 2, 4 CN503 Main PCB To p FPCB Top LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 102 - Only for training and service purposes...
Page 102 4. TROUBLE SHOOTING Measured 1khz Sine Wave Signal Measured 1khz Sine Wave Signal Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 103 - Only for training and service purposes...
Page 103 Note: It is recommanded that engineer should check the soldering of R, L, C along the • corresponding path before every step. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 104 - Only for training and service purposes...
Page 104 Change the main board At R501,R502? Can you hear sine wave Change each Speaker out of a speaker ? Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 105 - Only for training and service purposes...
Page 105 4. TROUBLE SHOOTING B SIDE C639,C640 U601 C643, C644 R501,R502 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 106 - Only for training and service purposes...
Page 107 • Signal from the mic - MIC → - R616 on main board → - C624,C625 on main board → - AB3000 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 108 - Only for training and service purposes...
Page 108 If fail again, Change the MIC change the main Bíd Change the main B,d Does it work properly ? Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 109 - Only for training and service purposes...
Page 111 Headset Can you hear sine wave Change the main Bíd out of the receiver ? LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 112 - Only for training and service purposes...
Page 112 Change the main Bíd at C406 ? Change the main Bíd Try again from the start Does it work properly ?? Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 113 - Only for training and service purposes...
Page 113 4. TROUBLE SHOOTING 4.10.6 Headset B SIDE CN400 R640 C406 R412 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 114 - Only for training and service purposes...
Page 114: Charger Trouble Shooting
Trouble Shooting Procedure • - Check the charger connecter - Check the Charging current Path - Check the battery Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 115 - Only for training and service purposes...
Page 115 Is the TA voltage 5.1V? Is it charging properly after changing Q600? Change the board Trouble Shooting - Charging LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 116 - Only for training and service purposes...
Page 116 4. TROUBLE SHOOTING Main Board ( Bottom side) - I/O connector and FET Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 117 - Only for training and service purposes...
Page 117: Checking Bluetooth Block
AB3000 Block 2. Check BT Chip Block VDDK_2V75(C610) VDDE_1V8 (C603) Main Board ( Bottom side) - AB3000 block LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 118 - Only for training and service purposes...
Page 118 VDDE_1V8(C112) Sub Board ( Bottom side) - Bluetooth Chip and Antenna CN100 Pin 38 Sub Board (Top side) Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 119 - Only for training and service purposes...
Page 119 WCDMA Tx SAW Filter U103 GSM / EDGE Transceiver(RF3000) U204 WCDMA Transceiver(RF3100) SW101 RF Test Connector U102 Bluetooth Clock Buffer LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 120 - Only for training and service purposes...
Page 120: Procedure To Check
Agilent 8960 : Test mode(GSM) Ch. 62, P.L. 7 level setting Ch. 62, -60dBm setting 5. Check GSM Block Redownload SW, Cal Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 121 - Only for training and service purposes...
Page 121: Checking Common Power Source Block
DC/DC VBAT GSM PA VBAT Step 1 PAM VBAT Block Main Board : Bottom side - Common Source Block LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 122 - Only for training and service purposes...
Page 122 Change Board Short? From C617 to D601 Soldering Check Component (CN600) In Power Source Block Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 123 - Only for training and service purposes...
Page 123 From C617 to C103, C104 Soldering Check Component (CN600) In Power Source Block LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 124 - Only for training and service purposes...
Page 124 Change Board to check inner line connection From C213 to C617 Soldering Check Component (CN600) In Power Source Block Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 125 - Only for training and service purposes...
Page 125 Check Point VDIGRAD_1V8 1.8V OK? Check the AB3000 (R603) Common Input Power is OK See The Next Part LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 126 - Only for training and service purposes...
Page 126: Checking Vcxo Block
(RF3000) Main board : bottom side Notebook to send TP command Oscilloscope Phone Connection for Checking VCXO Block Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 127 - Only for training and service purposes...
Page 127 MCLK 120K C139 C139 MCLK Schematic (Crystal Part) Figure 4-15. 26MHz at R211 Figure 4-15. 26MHz at R211 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 128 - Only for training and service purposes...
Page 128 WCLK Figure 4-16-2. Schematic (26MHz at TX part) Figure 4-17. 26MHz at C230 Figure 4-17. 26MHz at C230 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 129 - Only for training and service purposes...
Page 129 SYSCLK0 SYSCLK0 MCLK 120K MCLK C139 Figure 4-19. Schematic (26MHz at BB Part) Figure 4-20. 26MHz at C139 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 130 - Only for training and service purposes...
Page 130 Refer to Figure 4-17 26MHz at TX part Changing XTAL or U103 VCXO part is O.K. Check next stage Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 131 - Only for training and service purposes...
Page 131: Checking Front End Module Block
GND6 RX900 GSM_RX1 GSM_RX2 C104 C103 C102 C101 C112 C113 C105 0.01u Antenna Switch Module (+ GSM/EDGE PA) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 132 - Only for training and service purposes...
Page 132: Checking Front End Module Block Input Logic
WCDMA ANTSW0 ANTSW1 ANTSW2 EGSM RX DCS/PCS Tx ANTSW0 ANTSW1 ANTSW2 PCS Rx DCS Rx ANTSW0 ANTSW1 ANTSW2 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 133 - Only for training and service purposes...
Page 133 EGSM Tx DCS Tx PCS Tx EGSM Rx DCS Rx PCS Rx WCDMA Table 4-1. Front End module Logic LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 134 - Only for training and service purposes...
Page 134 High? Check ANTSW0(C105) To check Switch input power source Check each mode Change the Board By TP command Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 135 - Only for training and service purposes...
Page 135 4.17 part Check Try 4.17 part Logic OK? See the Next mode Change the Board (EGSM Tx Mode) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 136 - Only for training and service purposes...
Page 136 See the Next mode ANTSW0:High (DCS Tx Mode) ANTSW1:Low Change the Board ANTSW2:High WON : Low Change U101 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 137 - Only for training and service purposes...
Page 137 4.17 part Check Try 4.17 part Logic OK? See the Next mode Change the Board (DCS Tx Mode) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 138 - Only for training and service purposes...
Page 138 4.17 part Check Try 4.17 part Logic OK? See the Next mode Change the Board (PCS Tx Mode) Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 139 - Only for training and service purposes...
Page 139 Figure 4-26. DCS / PCS Tx Mode DCS Tx 4.17 part Check Try 4.17 part Logic OK? WCDMA Mode Change the Board LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 140 - Only for training and service purposes...
Page 140 Input Signal and Power to Change the Board Front End Module block is OK. See the Next Page Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 141 - Only for training and service purposes...
Page 141: Checking Wcdma Block
4. Check RF TX Level Bottom View 5. Check PAM Block 6. Check RF RX Level Re-download SW, Cal LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 142 - Only for training and service purposes...
Page 142 First of all, control signal should be checked. (data, clk, strobe) PIN14 (STROBE) PIN13 (CLK) PIN12 (DAT) Figure 4-28-1. Test points (Control Signal) Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 143 - Only for training and service purposes...
Page 143 Figure 4-28-2. Schematic (Control Signal) Notebook to send TP command Oscilloscope Phone Figure 4-29. Connection for Checking Control Signal LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 144 - Only for training and service purposes...
Page 144 If signal is not OK even after downloading, Change the U301 Control Signal is O.K. Check next stage Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 145 - Only for training and service purposes...
Page 145 Figure 4-31. Test point (RF TX Level) Notebook to send TP command Spectrum Analyzer Phone Fig. 4-32 Connection for Checking RF TX Level LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 146 - Only for training and service purposes...
Page 146 ( SW101) (C107) (C114) Fig. 4-33-3 Output Level at C115.Ant Fig. 4-33-4 Output Level at Isolator Output (IS201.2.Out ) Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 147 - Only for training and service purposes...
Page 147 Fig. 4-33-6 Output Level at PAM Input (IS201.3. In) ( C208) Fig. 4-33-7 Output Level at RF3100 Output ( C219) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 148 - Only for training and service purposes...
Page 148 Refer to Figure 4-33-6 You have to check PAM block. The U204 will be not operated. Change the board Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 149 - Only for training and service purposes...
Page 149 DC/DC (C201) from DC/DC converter WCDMA Duplexer Output (C227) Figure 4-34. Test points of WCDMA TX PAM block LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 150 - Only for training and service purposes...
Page 150 Check C201 Change 3.2V ? To Check PAM VCC the DC/DC BIAS from DC/DC converter (VCC_PA) Change The PAM Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 151 - Only for training and service purposes...
Page 151 To verify the RX path you have to check the pk-pk level and the shape of the RX I,Q. WRX_Q_ WRX_Q_ WRX_I_N WRX_I_P N(R206) P(R207) (R208) (R209) Figure 4-35. RF3100, WCDMA Transceiver (Bottom) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 152 - Only for training and service purposes...
Page 152 Figure 4-36-1. RX I,Q signal (CW:2142MHz) WRX_Q_P (R207) WRX_Q_N (R206) WRX_I_P (R209) WRX_I_N (R208) Figure 4-36-2. RX I, Q signal Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 153 - Only for training and service purposes...
Page 153 Verify whether the signal was similar as Figure Similar? Change RF3100 (U204) 4-36-2 with Oscilloscope. Check Next Stage LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 154 - Only for training and service purposes...
Page 154: Checking Gsm Block
5. Check RF TX Path 6. Check RF RX Path Re-download SW, Cal Figure 4-37-1. GSM Block (Bottom) Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 155 - Only for training and service purposes...
Page 155 Refer to 4.19.2 Checking Ant. SW Module IF you already check this point while checking Ant. SW module (4.19.2), You can skip this test. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 156 - Only for training and service purposes...
Page 156 Figure 4-38. Test points of RF control signals STRB STRB DATA DATA Figure 4-39. GSM RF Control signal Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 157 - Only for training and service purposes...
Page 157 Refer to Figure 4-39 Short? Similar? Re-download SW Change the board Control signal is OK. See next page to check LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 158 - Only for training and service purposes...
Page 158 4. TROUBLE SHOOTING 4.20.5 Checking RF Tx Path A. GSM Tx path Level Figure 4-40. GSM/DCS/PCS Tx Path Level Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 159 - Only for training and service purposes...
Page 159 4. TROUBLE SHOOTING PIN 19, 20, 21, 22 (Bottom) Figure 4-41. Test Points of GSM/DCS/PCS Tx Path LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 160 - Only for training and service purposes...
Page 160 Refer to Figure 4-42. Similar? GSM>32dBm DCS>29dBm PCS>29dBm GSM/DCS/PCS Tx path OK. See Chapter 4.8.6 to check Rx path Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 161 - Only for training and service purposes...
Page 161 Check GSM RF Transceiver GSM/DCS/PCS Redownload SW Output power at >5dBm See Next page to check Tx path LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 162 - Only for training and service purposes...
Page 162 Check GSM/DCS PAM DCS: 30.0dBm (U101) output power at C114. GSM Tx path OK. See Next page to check Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 163 - Only for training and service purposes...
Page 163 GSM : -51.5dBm GSM : - 50dBm DCS : - 50dBm PCS : -50dBM Figure 4-45. GSM/DCS/PCS Rx Path Level LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 164 - Only for training and service purposes...
Page 164 Agilent 8960 Setting CW Mode GSM : -50dBm@Ch65(948MHz) DCS : -50dBm@Ch700(1842.8MHz) PCS : -50dBm@ch700(1967.8MHz) v Oscilloscope Setting Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 165 - Only for training and service purposes...
Page 165 PCS : -50dBm@ch700(1967.8MHz) Check GSM/DCS/PCS Rx GSM:-51.5dBm Change Ant. SW module signal level at DCS/PCS:-51.7dBm (U101) GSM Rx path OK. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 166 - Only for training and service purposes...
Page 166: Download
- The software of the phone may be changed to enhance the performance of the phone. - The older version software of the phone can be replaced to the newer version. • Download Tools - LGDP2 : Download tool for KT520 software 5.2 Download Environment Setup • Items needed to download SW images with LGDP2.
Page 167: Kt520 Download
(At lease three(75%) more). B. Push “the Next Button” in Found New Hardware Wizard LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 168 - Only for training and service purposes...
Page 168 D. Select “Include this location in the search” in Found New Hardware Wizard E. Push “the Browse Button” , and then select “USB driver Information file” This File is provided with LGDP2. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 169 -...
Page 169 F. Select “Mobile Equipment USB Flash” in Found New Hardware Wizard You must be select this..! G. Continue Anyway LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 170 - Only for training and service purposes...
Page 170 5. DOWNLOAD H. Please wait while the wizard installs the software.. I. Push “the Finish Button” in Found New Hardware Wizard Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 171 - Only for training and service purposes...
Page 171: How To Kt520 Download
• Port Selection : After checking the USB Mode , it should be checked for the download port from COM57 to COM72. • DLL Selection : Selecting the DLL file in C:\DOWNLOAD\Model\KT520 • Run Download Configuration : - AP Image : Select the BIN file in C:\DOWNLOAD\Model\KT520 - MP Image : Select the DZ file in C:\DOWNLOAD\Model\KT520 - Select the Update Boot, Update Modem Boot when changing the buyer.
Page 172 5. DOWNLOAD Select USB Mode KT520 KT520 KT520 KT520 KT520 KT520 KT520 KT520 KT520 KT520 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 173 - Only for training and service purposes...
Page 173 In case of Fail, it will be reconnected. In case of ‘Pass’, connect the new phone. KT520 KT520 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 174 - Only for training and service purposes...
Page 174: Block Diagram
U103(RF3000) U101 Test Conn. SW101 Crystal -26M X101 Bluetooth STLC2500 Antenna Bluetooth U101 Figure 6-1. RF Block Diagram Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 175 - Only for training and service purposes...
Page 175 FL102 SAFEB1G96FA0F00 Filter FL103 SAFEB1G84FA0F00 Filter U301 DB3150 Modem Bluetooth U101 STLC2500 Bluetooth Table 6-1. RF Block Component LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 176 - Only for training and service purposes...
Page 176: Circuit Diagram
C138 0.01u C137 WCLK X101 R111 QDATA_AMP_MSB 100K 26MHz KSX-23-26000KFA-QA0R IDATA_FREQ_MSB R113 100K VDIGRAD_1V8 MCLK 120K C139 C140 Copyright © 2008 LG Electronics. Inc. All right reserved. - 177 - LGE Internal Use Only Only for training and service purposes...
Page 177 GND2 GND5 R206 RF_CTRL_DATA WRX_Q_N GND3 GND4 R207 RF_CTRL_CLK WRX_Q_P R208 RF_CTRL_STRB WRX_I_N R209 C230 5.6p WCLK WRX_I_P LGE Internal Use Only - 178 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 178 APP_GPIO_14 EMIF2_NFIF_READY NF_READY EMIF2_WAIT_N VDD_CAM_1V8 VDDE_1V8 R312 3300 R313 3300 R314 3300 R316 3300 OJ300 OJ301 OJ302 OJ303 Copyright © 2008 LG Electronics. Inc. All right reserved. - 179 - LGE Internal Use Only Only for training and service purposes...
Page 179 EMI Filter ONSWB_n CTS_ON_I CTS_ON_E CTS_ON Close to 18pin CON DOWNLOAD POINT EMI/ESD Filter for UART and DCIN LGE Internal Use Only - 180 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 180 KEYOUT3 HALL EFFECT SWITCH KEYPAD BACKLIGHT LED KB_STAR KB511 R642 KEYOUT4 KEY PAD AND SIDE KEY PAD R643 Copyright © 2008 LG Electronics. Inc. All right reserved. - 181 - LGE Internal Use Only Only for training and service purposes...
Page 181 TEST BOOST_SW3 ACC_GP13_SPK_AMP_EN _SHUTDOWN VREF BOOST_FB+ IREF VSSBOOST BYPASS C646 0.01u R625 ACC_GP27_AMP_SW_EN Separate VSS_DIG & VSS_PLL GND LGE Internal Use Only - 182 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 182 C106 C107 C108 C109 C110 C111 C112 C113 0.22u 0.22u 0.22u 0.1u 0.22u 0.1u 0.1u 0.22u VSS_BT_ANA VSS_BT_RF Copyright © 2007 LG Electronics. Inc. All right reserved. - 183 - LGE Internal Use Only Only for training and service purposes...
Page 183 RIGHT R129 KEYOUT2 Q100 EMX18 R131 DOWN CANCEL KEYOUT3 CALL UPPER KEY LED ONSWA_n KEYOUT4 OJ KEY PAD LGE Internal Use Only - 184 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 184 LCD_CS_n KEYOUT3 KEYOUT4 APP_GP10_BL_CTRL ONSWA_n APP_GP15_CAM_LDO_CTRL Main to OJ key PCB TP100 AXK8L40125 (0.9T Header) TP101 TP102 TP103 Copyright © 2007 LG Electronics. Inc. All right reserved. - 185 - LGE Internal Use Only Only for training and service purposes...
Page 186: Bga Pin Map
8. BGA Pin Map 8. BGA Pin Map DB3150 ( Digital BB) : NC Pin Index mark Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 187 - Only for training and service purposes...
Page 192: Pcb Layout
No Power On CN502 Hall Effect IC No Slider off detection LD501/502 Key Backlight LED No Key LED Copyright © 2008 LG Electronics. Inc. All right reserved. - 193 - LGE Internal Use Only Only for training and service purposes...
Page 193 FL101/102/103 GSM Rx SAW Filter GSM RX Sensitivity FL203 WCDMA Duplexer No Service WCDMA RX Sensitivity & Tx Power No Service LGE Internal Use Only - 194 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 194 9. PCB LAYOUT FL101 Micro-SD Level Shifter No Micro-SD CN100 Sub PCB conn No Micro-SD No BT Connection Copyright © 2007 LG Electronics. Inc. All right reserved. - 195 - LGE Internal Use Only Only for training and service purposes...
Page 195 9. PCB LAYOUT BAT100 Backup Battery RTC Reset FL100 BT Balun No BT Connection U101 BT Chip No BT Connection LGE Internal Use Only - 196 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 197 No Power On No Display CN102 Optical Mouse conn U100 Optical Mouse Level No Optical Mouse Shifter No Optical Mouse LGE Internal Use Only - 198 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 198 No Speaker No Optical Mouse No Display No Power On No Vibration No Optical Mouse No Power On Copyright © 2008 LG Electronics. Inc. All right reserved. - 199 - LGE Internal Use Only Only for training and service purposes...
Page 200: Calibration
10. Calibration 10. Calibration 10.1 General Description This document describes the installation and software usage for the calibration of LG’s GSM/GPRS/EDGE/WCDMA Multimedia Mobile Phone. The calibration menu and it’s result is displayed in PC terminal by Mobile phone. 10.2 XCALMON Environment 10.2.1 H/W Environment...
Page 201: Calibration Environment
Parameter Unit Temperature Relative Humidity Vbatt Supply current Table 10-1. Nominal Environmental Test Conditions LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 202 - Only for training and service purposes...
Page 202: Program Operation
- Calibration of EGSM 900, DCS 1800, PCS1900, and WCDMA - Instrument (Agilent8960, Tektronix PS2521G) control - UART communication with mobile phone Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 203 - Only for training and service purposes...
Page 203 10. Calibration 10.4.2 Setting Select a ezlooks Select Off-line in the EZLOOKS MODE. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 204 - Only for training and service purposes...
Page 204 10. Calibration Select a Line System Select Manual in the RUN MODE. Select your com port appropriately. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 205 - Only for training and service purposes...
Page 205 3. CAL + AUTO Select your com port appropriately. MONitor Port is to communicate with 2.5G mobile phone LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 206 - Only for training and service purposes...
Page 206 10. Calibration 10.4.3 Calibration Procedure Select a model name - KT520. Click the START button. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 207 - Only for training and service purposes...
Page 208: Exploded View & Replacement Part List
11. EXPLODED VIEW & REPLACEMENT PART LIST 11.1 EXPLODED VIEW 35 36 31 32 19 20 9 10 37 39 Copyright © 2007 LG Electronics. Inc. All right reserved. - 209 - LGE Internal Use Only Only for training and service purposes...
Page 212: Replacement Parts
COMPLEX, (empty), , , , , Color Without MIDZ01 INSULATOR MIDZ0175501 COMPLEX, (empty), , , , , Color Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 213 - Only for training and service purposes...
Page 213 COMPLEX, (empty), , , , , Color Without MTAD00 TAPE,WINDOW MTAD0079801 COMPLEX, (empty), , , , , Color LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 214 - Only for training and service purposes...
Page 214 MGAD0159401 COMPLEX, (empty), , , , , Color Without MPBZ00 MPBZ0212801 COMPLEX, (empty), , , , , Color Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 215 - Only for training and service purposes...
Page 215 0.1 uF,10V ,K ,X5R ,HD ,1005 ,R/TP CONNECTOR,BOARD TO CN100 ENBY0020301 40 PIN,0.4 mm,ETC , ,H=0.9, Socket BOARD LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 216 - Only for training and service purposes...
Page 216 WHITE ,1608 ,R/TP ,PB-FREE(ZENER) R121 RES,CHIP,MAKER ERHZ0000490 51 ohm,1/16W ,J ,1005 ,R/TP R122 RES,CHIP,MAKER ERHZ0000490 51 ohm,1/16W ,J ,1005 ,R/TP Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 217 - Only for training and service purposes...
Page 217 ECCH0005604 ,[empty] ,[empty] ,[empty] ,[empty] ,[empty] ,0.8 mm C105 CAP,CERAMIC,CHIP ECCH0000115 22 pF,50V,J,NP0,TC,1005,R/TP PCB ASSY,MAIN,PAD C107 SAFP0000501 SHORT LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 218 - Only for training and service purposes...
Page 218 ,[empty] ,[empty] ,[empty] ,[empty] ,[empty] ,0.8 mm C203 CAP,CERAMIC,CHIP ECCH0000155 10 nF,16V,K,X7R,HD,1005,R/TP C204 CAP,CERAMIC,CHIP ECCH0000143 1 nF,50V,K,X7R,HD,1005,R/TP C205 CAP,CERAMIC,CHIP ECCH0000110 10 pF,50V,D,NP0,TC,1005,R/TP Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 219 - Only for training and service purposes...
Page 219 ECCH0000182 0.1 uF,10V ,K ,X5R ,HD ,1005 ,R/TP C320 CAP,CERAMIC,CHIP ECCH0000182 0.1 uF,10V ,K ,X5R ,HD ,1005 ,R/TP LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 220 - Only for training and service purposes...
Page 220 ECCH0000182 0.1 uF,10V ,K ,X5R ,HD ,1005 ,R/TP C419 CAP,CERAMIC,CHIP ECCH0000198 2.2 uF,6.3V ,M ,X5R ,TC ,1005 ,R/TP Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 221 - Only for training and service purposes...
Page 221 ECCH0004904 1 uF,6.3V ,K ,X5R ,TC ,1005 ,R/TP C624 CAP,CERAMIC,CHIP ECCH0000182 0.1 uF,10V ,K ,X5R ,HD ,1005 ,R/TP LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 222 - Only for training and service purposes...
Page 222 FL102 FILTER,SAW SFSY0024303 1960 MHz,1.4*1.1*0.6 ,SMD ,5pin, Unbal-Bal, 50//150 FL103 FILTER,SAW SFSY0024301 942.5 MHz,1.4*1.1*0.6 ,SMD ,5pin, Unbal-Bal, 50//150 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 223 - Only for training and service purposes...
Page 223 33 ohm,1/16W ,J ,1005 ,R/TP R102 RES,CHIP,MAKER ERHZ0000406 100 Kohm,1/16W ,J ,1005 ,R/TP R103 RES,CHIP,MAKER ERHZ0000469 36 ohm,1/16W ,J ,1005 ,R/TP LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 224 - Only for training and service purposes...
Page 224 100 Kohm,1/16W ,J ,1005 ,R/TP R316 RES,CHIP,MAKER ERHZ0000465 3300 ohm,1/16W ,J ,1005 ,R/TP R406 RES,CHIP,MAKER ERHZ0000405 10 Kohm,1/16W ,J ,1005 ,R/TP Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 225 - Only for training and service purposes...
Page 225 39 Kohm,1/16W ,F ,1005 ,R/TP R627 RES,CHIP,MAKER ERHZ0000493 51 Kohm,1/16W ,J ,1005 ,R/TP PCB ASSY,MAIN,PAD R630 SAFP0000501 SHORT LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 226 - Only for training and service purposes...
Page 226 VMN2 ,5 V,10 W,R/TP ,1.0*0.6*0.4 ,; , ,7.82V , , ,100mW ZD401 DIODE,TVS EDTY0009401 ,[empty] ,[empty] ,2P ,1 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 227 - Only for training and service purposes...
Page 227 PCB ASSY,MAIN,PAD R407 SAFP0000501 SHORT R409 RES,CHIP,MAKER ERHZ0000478 3.3 ohm,1/16W ,J ,1005 ,R/TP PCB ASSY,MAIN,PAD R501 SAFP0000501 SHORT LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 228 - Only for training and service purposes...
Page 228 ECZH0001216 220 nF,10V ,K ,X5R ,TC ,1005 ,R/TP C111 CAP,CERAMIC,CHIP ECCH0000182 0.1 uF,10V ,K ,X5R ,HD ,1005 ,R/TP Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 229 - Only for training and service purposes...
Page 229 SPJY00 PCB,SUB SPJY0050101 FR-4 ,0.5 mm,BUILD-UP 4 , ,; , , , , , , , , , LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 230 - Only for training and service purposes...
Page 230: Accessory
100-240V ,5060 Hz,5.1 V,.7 A,CE ,AC-DC ADAPTOR ,; ADAPTOR,AC-DC SSAD0024504 ,85Vac~264Vac ,5.1V(+0.15V, -0.2V) ,700mA ,5060 , ,WALL 2P ,I/O CONNECTOR , Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 231 - Only for training and service purposes...
Page 231 Note...
Page 232 Note...

LG KT520 Service Manual

1 Introduction

2 Performance

3 Technical Brief

4 Trouble Shooting

5 Download

6 Block Diagram

7 Circuit Diagram

8 BGA Pin Map

9 Pcb Layout

10 Calibration

11 Exploded View & Replacement Part List

Quick Links

Troubleshooting

Related Manuals for LG KT520

Summary of Contents for LG KT520

Table of Contents