LG -T370 Service Manual

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Internal Use Only

Service Manual

LG-T370

Date: April, 2012 / Issue 1.0

Table of Contents

Troubleshooting

Summary of Contents for LG LG-T370

Page 1 Internal Use Only Service Manual LG-T370 Date: April, 2012 / Issue 1.0...
Page 2: Table Of Contents
4.1 Micro SD (uSD) Trouble ..............9 4.13 Bluetooth Trouble ................94 4.14 FM Radio Trouble ................96 LGE Internal Use Only - - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 4 • When returning system boards or parts like EEPROM to the factory, use the protective package as described. LGE Internal Use Only - 4 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 5: Abbreviations
Low Drop Output Light Emitting Diode OPLL OPLL Off t Ph Offset Phase Locked Loop L k d L LGE Internal Use Only - 5 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 6 Time Division Multiple Access UART Universal Asynchronous Receiver/Transmitter Voltage Controlled Oscillator VCTCXO Voltage Control Temperature Compensated Crystal Oscillator Wireless Application Protocol LGE Internal Use Only - 6 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 7: Performance
EAR Phone Jack Yes (3.5Φ) PC Synchronization Speech coding EFR/FR/HR Data and Fax Vibrator Loud Speaker Voice Recoding Microphone LGE Internal Use Only - 7 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 8 SW MIDI (Mono SPK) Camera 2.0M FF Bluetooth / FM Radio Bluetooth version 2.1 / Wired FM radio (Earphone needed) LGE Internal Use Only - 8 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 9: Technical Specification
Power Toler. 30dBm 14dBm 28dBm 12dBm 26dBm 10dBm 24dBm 8dBm 22dBm 6dBm 20dBm 4dBm 18dBm 2dBm 16dBm 0dBm LGE Internal Use Only - 9 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 10 GSM850/ EGSM Offset from Carrier (kHz). Max. dBm Output RF Spectrum (due to switching transient) transient) 1,200 1,800 LGE Internal Use Only - 10 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 11 3 dB 12 3 dB Frequency (Hz) Max.(dB) Min.(dB) 1,000 Sending Response 2,000 3,000 3,400 4,000 4 3 dB LGE Internal Use Only - 11 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 12 At least 55 dBspl under below conditions: Ringer Volume 1. Ringer set as ringer. 2. Test distance set as 1 m LGE Internal Use Only - 1 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 13 Capacity: 950mAh Switching mode charger Switching-mode charger Input: 100 ~ 240V, 50/60 Hz Travel Charger Output: 4.8V, 400mA LGE Internal Use Only - 13 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 14: Technical Brief
0 . 15 5 % ZXTP 25020 for example Battery Charger Figure. 3.1.1 X-Gold tm 215 Hardware Block Diagram LGE Internal Use Only - 14 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 15 – RSA(ROM)/SHA-1(HW accel.) – RSA(ROM)/SHA-1(HW accel.) – OCDS disabling – OCDS disabling – Certificate Management – Certificate Management LGE Internal Use Only - 15 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 16: External Memory
• USB2.0 up to 480 Mbit/s (High Speed) w/ external USB Phy over ULPI interface • Stereo Headset (Amplifier integrated) • 3 external analog measurement PIN’s • Bluetooth LGE Internal Use Only - 16 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 17: Power Management
• USB battery charging – USB charging spec 1.0 compliant • Backlight – Up to 4 serial white LEDs (integrated LDO) LGE Internal Use Only - 17 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 18 • True ring tones (MP3) • MP3, eAAC+ • MP3, eAAC+ • G.722 SB-ADPCM encoding/decoding • G.722 SB-ADPCM encoding/decoding LGE Internal Use Only - 18 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 19: Power Management
100mA. That is the load current estimated for the GSM talk mode. load current of 100mA. That is the load current estimated for the GSM talk mode. LGE Internal Use Only - 19 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 20 The RF module has implemented several LDO’s for different RF Power domain. The mixed signal module has some LDO’s for the audio driver and microphone supply. LGE Internal Use Only - 0 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 21 3. TECHNICAL BRIEF 3. TECHNICAL BRIEF Table. 3-2-1 Power supply Domains (without RF) LGE Internal Use Only - 1 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 22 VCXO_enable signal. The reason for the startup is stored in the ResetSourceRead register. Battery Measurement LGE Internal Use Only - - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 23 Figure.3.3.2 First Part of the State Machine, Running in Di erent Power Domains than the Second Part Figure.3.2.2 First Part of the State Machine, Running in Dierent Power Domains than the Second Part LGE Internal Use Only - 3 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 24 DCXO timer (16ms) System ON reset_pmu_n=1 Figure 3.2.2 Second (Main) Part of the Startup State Machine in the VPMU Domain LGE Internal Use Only - 4 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 25 This is important, especially in half/full-wave charging where the charger detection is switching between charger detected/not detected according the AC supply frequency. reasons LGE Internal Use Only - 5 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 26 LCORE core regulator and wait for the core to reach reset state before powering up the I/O supply regulators. LGE Internal Use Only - 6 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 27 LCORE rf_sysclk_en reset_pmu_n pad_isolation_n System System Figure 3.2.3 Start Up Sequence (triggered by First Connect Event) LGE Internal Use Only - 7 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 28 In testmode signal reset_pmu_n_o is high, that means the chip reset is fully controlled from external LGE Internal Use Only - 8 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 29 PMU state-machine is high, vcxo_enable controls the rf_sysclk_en signal to the RF. If rf_sysclk_en_pmu is low, the DXCO is switched off, independent from vcxo_enable. LGE Internal Use Only - 9 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 30 That means all PMU register are reset in OFF state. For details about the SW reset see chapter External Reset Handling LGE Internal Use Only - 30 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 31 Depending on this value it selects a startup pulse-width for the DC/DC converter out of a register table. (4-values) LGE Internal Use Only - 31 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 32 32 kHz clock to archive the target OFF current the 32 kHz clock to archive the target OFF current LGE Internal Use Only - 3 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 33: Fem With Integrated Power Amplifier Module
LOGIC DECODER VSW_EN (11) (19) RX1 Match Tx_LB_IN (9) 01643_001 Figure. 3-3-1 SKY77550-21 FUNCTIONAL BLOCK DIAGRAM 3.3.2 General Description LGE Internal Use Only - 33 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 34 B_P_942_5/881_5MHz_1 RF_LB_RXN L111 GND1 B_P_942_5/881_5MHz_2 GND2 C114 L113 GND3 GND4 0.5p RF_LB_RXP L114 Figure 3.3.3 FEM CIRCUIT DIAGRAM LGE Internal Use Only - 34 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 35: Crystal(6 Mhz, X01)
(LUXO). The LUXO calculates the corresponding DIG value according to the given AFC value. LGE Internal Use Only - 35 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 36: Rf Subsystem Of Pmb8815 (U01)
GSM850 or EGSM900, and one high band, DCS1800 or PCS1900. A block diagram of the RF subsystem is given in Figure 3-4-1. LGE Internal Use Only - 36 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 37: Functional Description
LGE Internal Use Only - 37 - - 37 - Copyright © 01 LG Electronics. Inc. All right reserved. Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes Only for training and service purposes...
Page 38 PLL is provided by the reference oscillator. the phase detector incorporated in the PLL is provided by the reference oscillator. LGE Internal Use Only - 38 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 39 LGE Internal Use Only - 39 - - 39 - Copyright © 01 LG Electronics. Inc. All right reserved. Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes Only for training and service purposes...
Page 40: Power Supply
One embedded direct-to-battery LDO provides the 2.5 V supply voltage for the remaining circuits. Figure. 3.5.5 POWER SUPPLY BLOCK DIAGRAM Figure. 3.5.5 POWER SUPPLY BLOCK DIAGRAM LGE Internal Use Only - 40 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 41: Memory(H9DaGh1Ghmmmr, U301 )
40% and erase time to be reduction by 50%. In case of multi-plane operation, there is small degradation at 1.8V application in terms of program/erase time.. LGE Internal Use Only - 41 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 42 10 Year Data retention ONFI 1.0 COMFLIANT COMMAND SET ELECTRICAL SIGNATURE - Munufacture ID: ADh - Device ID LGE Internal Use Only - 4 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 43 - Programmable CAS latency 2 or 3 supported Burst Length - Programmable burst length 2 / 4 / 8 with both sequential and interleave mode LGE Internal Use Only - 43 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 44: Bt Module
Radio Specification and enhanced data rate specification and meets or exceed the requirement to provide the highest communication link quality of service. LGE Internal Use Only - 44 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 46: Sim Card Interface
This signal makes SIM card to HW default status. SIM_CLK This signal is transferred to SIM card. SIM_DATA_1 This signal is interface datum. LGE Internal Use Only - 46 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 47: Lcd Interface
Color is determined with a 6 bit gray scale signal for each dot, thus, presenting a palette of More than 262,144 colors. LGE Internal Use Only - 47 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 48 Users can easily configure LDO output voltage via the I2C interface control. The LDOs also provide current limiting and over-temperature functions. The RT9396 is available in a WQFN-24L 3x3 package. LGE Internal Use Only - 48 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 49 4.0mA or less. This feature results in higher efficiency under light-load conditions. Further reduction in quiescent current will result from using fewer than four LEDs. LGE Internal Use Only - 49 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 50: Miniabb (Battery Charger & Muic) Interface
PMU(Power Management Unit)when an external power source(either USB VBUS or wall adapter) is connected to the USB connector. LGE Internal Use Only - 50 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 51: Audio Interface
The following figure shows an architecture overview of the Audio section. Figure 3.12.1 Audio Section Overview Figure 3.12.1 Audio Section Overview LGE Internal Use Only - 51 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 52 100% by Firmware. • The high-pass functions of the voiceband filters have to be implemented in firmware on TEAKLite®. LGE Internal Use Only - 5 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 53 Loudspeaker driver, b) one mono, differential Earpiece driver and c) one stereo, single-ended (with uni- or bipolar signals), Headset driver. LGE Internal Use Only - 53 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 54 The buffers are designed to be short circuit protected. Figure 3.12.3 Switching for R/L DACs onto Buffers Figure 3.12.3 Switching for R/L DACs onto Buffers LGE Internal Use Only - 54 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 55 To improve SNR the sample frequency can be doubled in dedicated modes and the modulated data stream is 4MHz instead of 2 MHz. LGE Internal Use Only - 55 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 56 VMIC MICP MICN TBV_Typical_Microphone_Supply_Generation_alternative Figure 3.11.5 Typical Microphone Supply Generation (alternative) Figure 3.12.5 Typical Microphone Supply Generation (alternative) LGE Internal Use Only - 56 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 57: Camera Interface(M Fixed Focus Camera)
Programming is done by register read/write transactions using an AHB slave interface. Figure 3.13.1 Block Diagram of Camera Interface Figure 3.12.1 Block Diagram of Camera Interface LGE Internal Use Only - 57 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 58 Color processing (contrast, saturation, brightness, hue) • Power management by software controlled clock disabling of currently not needed sub-modules LGE Internal Use Only - 58 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 59 CAM_F_DATA[2] CAM_F_DATA[1] CAM_F_DATA[0] VCAM_ANA_2V8 R616 CAM_PCLK VCAM_IO_1V8 CAM_RST_N VCAM_DIG_1V8 C617 C620 7.5p CAM_PWDN 7.5p Figure 3-12 Camera Connector LGE Internal Use Only - 59 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 60: Touch Interface
A POR generates a reset signal at power-up. A POR generates a reset signal at power-up. LGE Internal Use Only - 60 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 62: Trouble Shooting
GPRS QUAD TX DUAL RX MODULE U101 SKY77550-21 Crystal, 26MHz Clock X201 TSX- 3225 RF Switch RF Switch SW101 MS-156C LGE Internal Use Only - 6 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 63: Rx Trouble
(1) Check Crystal Circuit () Check Mobile SW &TX module (3) Check PLL Control Re-download or Do calibration again LGE Internal Use Only - 63 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 64 SIM_CLK C225 SIM_RST_N SIM_RST 0.1u MSD_CMD MMCI_CMD VDDP_MMC MMCI_DAT_0 MSD_D[0] MSD_CLK MMCI_CLK Figure 4.2.2 Figure 4.2.2 Figure 4.2.3 LGE Internal Use Only - 64 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 65 RF_HB_RXP B_P_1960/1842_5MHz_2 1.8n U_P_1842_5/ 881_5MHz B_P_942_5/881_5MHz_1 RF_LB_RXN L111 GND1 B_P_942_5/881_5MHz_2 GND2 C114 L113 GND3 GND4 0.5p RF_LB_RXP L114 LGE Internal Use Only - 65 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 66 Mobile SW & TX Module is OK. Mobile SW & TX Module is OK. EGSM Rx EGSM Rx LGE Internal Use Only - 66 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 67 VRF1 (TP06 : C214) VDDXO (TP09 : C211) VDDTRX ( TP07 : C208 ) VDDMS (TP10 : C213) Figure 4.1 LGE Internal Use Only - 67 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 68: Power On Trouble
(1%) VDD_IO_1V8 R205 VBAT 5.6K C222 NANDD_DDRA[00] A_D0 NANDD_DDRA[01] A_D1 NANDD_DDRA[02] A_D2 Figure 4.2 power block of T370 LGE Internal Use Only - 68 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 69 Is the phone power on? Re-download software Does it work properly? The phone will Replace the main board Properly operating. LGE Internal Use Only - 69 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 70: Charging Trouble
MUIC_ACC_ID U401 UART_TX FB401 1800 2.2K LP8727-B EAN62339701 R410 AUD1 AUD2 VUSB_LDO_4V9 EXPDET VDD_IO_1V8 R402 I2C_SCL I2C_SDA MUIC_INT_N LGE Internal Use Only - 70 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 71 TP1 (Charging IC(U401))=5.1V ? Change the TA Replace the main board Battery is charged? Charging is properly operating LGE Internal Use Only - 71 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 72: Vibrator Trouble
4. TROUBLE SHOOTING 4.5 Vibrator Trouble Vibrator PAD / VB401 R408 (TP1) Figure 4.6 LGE Internal Use Only - 7 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 73 4. TROUBLE SHOOTING Main Chip (U201) VB401 R408 VIB_P C404 C405 L402 LGE Internal Use Only - 73 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 74 Is PWM Signal OK? Is the voltage at VB401 Replace the Pad (+) high? Replace vibrator Vibrator Working well ! LGE Internal Use Only - 74 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 75: Lcd Trouble
LCD_F_DATA[7] LCD_F_DATA[6] LCD_VSYNC_OUT(4th PIN) LCD_F_DATA[5] LCD_F_DATA[4] LCD_F_WR_N(5th PIN) LCD_F_CS_N(8th PIN) LCD_F_RS(9th PIN) LCD_F_DATA[3] LCD_F_DATA[2] LCD_F_DATA[1] LCD_F_DATA[0] Figure 4.7 LGE Internal Use Only - 75 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 76 LED5 R609 VPROX_3V0 BACKLIGHT_KEY LDO1 LED6 C610 C609 C608 C619 C611 2.2u I2C_SCL I2C_SDA LCD_BL_CTRL LCD_PWM R611 100K LGE Internal Use Only - 76 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 77 LCD_BL_CTRL Graph 4.7.1. LCD Backlight Control Signal Waveform LCD_RS LCD_CS LCD WR LCD_WR Graph 4.7.2. LCD Data Waveform LGE Internal Use Only - 77 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 78 Check the Waveform of EMI filter ? (FL601,FL60,FL603) (FL601,FL60,FL603,TP606) Replace LCD module Does LCD work properly ? LCD working well ! LGE Internal Use Only - 78 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 79: Camera Trouble
TP04 :C614 TP06 :C612 TP09 :VA606(DNI) TP01 :C609 TP03 :C619 TP02 :C608 TP07 :R211 TP08 :R212 Figure 4.8 LGE Internal Use Only - 79 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 80 C230 C231 C232 C233 C235 C234 VREF VDD_IO_1V8 C236 220n TP204 R211 2.2K PWRON R212 2.2K I2C_SDA I2C_SCL LGE Internal Use Only - 80 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 81 Graph 4.8.2. MCLK Waveform CAM_HSYNC CAM_VSYNC CAM_HSYNC CAM_PCLK_26MHz Graph 4.8.3.CAM_VSYNC vs. Graph 4.8.4.CAM_HSYNC vs. CAM_HSYNC Waveform CAM_PCLK Waveform LGE Internal Use Only - 81 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 82 Data pins on U60? Does Camera work Replace U01 or Change the board properly ? Camera working well ! LGE Internal Use Only - 8 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 83: Speaker / Receiver Trouble
FSYS_EN BT_CLK_REQ VDDP_DIG1 RCV_HS_N RCV_HS_P SPK_HS_L SPK_HS_R C528 L504 CN501 SPK_P C530 L505 EAB62429501 SPK_N D501 D502 C537 LGE Internal Use Only - 83 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 84 Check the Audio signal Check the Audio signal Replace/Change the M501 L504,L505 L504,L505 (TP7,08) (TP5,06) Receiver Working well!! Speaker Working well!! LGE Internal Use Only - 84 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 85: Earphone Trouble
FB507 : TP3 R512 : TP10 FB501 : TP1 FB503 : TP4 C515 : TP7 C510 : TP6 LGE Internal Use Only - 85 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 86 C522 HS_MIC_P C523 C524 C525 2.2u VDD_IO_1V8 HS_GND TP12:C525 U502 NCS2200SQ2T2G R524 VIN- R527 HS_HOOK_DET VIN+ C541 120p LGE Internal Use Only - 86 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 87 C55(TP1) Or change the and try again M501(amp),U01(BB IC) Earphone will work properly LGE Internal Use Only - 87 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 88: Microphone Trouble
HS_JACK_DET AGND C230 C231 C232 C233 C235 C234 VREF VDD_IO_1V8 C236 220n TP204 R211 2.2K PWRON R212 2.2K LGE Internal Use Only - 88 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 89 Is it a few tens mV AC? Check the soldering of Re-solder component C53, C59(TP5,6) Microphone will work properly. LGE Internal Use Only - 89 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 90: Sim Card Interface Trouble
VA308 VCC1 GND2 C315 VA309 C316 C317 VA311 C5_1 C318 VA312 C319 VA310 C323 C320 C321 0.1u 0.1u LGE Internal Use Only - 90 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 91 Change the main board Properly? Does it work Properly? SIM card is properly working SIM card is properly working. LGE Internal Use Only - 91 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 92: Micro Sd (Usd) Trouble
470K CN301 R307 MSD_DET_N R308 MSD_D[2] R309 MSD_D[3] R310 MSD_CMD R311 MSD_CLK MSD_D[0] R312 R313 MSD_D[1] C310 C311 LGE Internal Use Only - 9 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 93 Check out MC_CLK & Re-download SW Data Timing(TP3) OK? Replace Micro SD Card Micro SD Card will work properly LGE Internal Use Only - 93 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 94: Bluetooth Trouble
UART_RTS_N BT_UART_CTS TP709 BTCX_TXCONF GPIO_0 UART_CTS_N BT_UART_RTS GPIO_6 TP710 BT_WAKEUP_HOST GPIO_1 HUSB_DN BT_CLK_REQ GPIO_5 HUSB_DP TP711 C713: TP2 LGE Internal Use Only - 94 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 95 Replace VDD_IO_1V8 U701 Check RTC3K Replace TP1 (C711) U701 Check BT_CLK_6M Replace TP(C713) U701 BT will work properly LGE Internal Use Only - 95 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 96: Fm Radio Trouble
ZD201 : TP06 R214 R215 C242 470n C239 FM_LNA_OUT Q202 Q202 To Main Chipset! FM_LNA_IN 330p C240 R217 4.7K 470n LGE Internal Use Only - 96 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 97: Lge Internal Use Only
(LNA_EN_L0 : TP 04) A condition is good? Replace Q0 Check Bias Voltage Replace U01 VDD_FMR(C4) FM_radio will work properly LGE Internal Use Only - 97 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 98: Touch Trouble
2.2K R212 2.2K I2C_SDA I2C_SCL VDD_IO_1V8 VTOUCH_3V0 CN403 No9=NC(reset) I2C_SCL I2C_SDA TOUCH_INT No7=NC(VDDIO) TOUCH_ID GB042-10S-H10-E3000 VA407 C416 0.1u LGE Internal Use Only - 98 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 99 Contact well CN404 and touch panel touch panel contact Resolder CN404 or replace touch panel Touch will work properly LGE Internal Use Only - 99 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 100: Memory Trouble
TP301 NANDD_DDRA[00] NANDD_DDRA[01] NANDD_DDRA[02] NANDD_DDRA[03] NANDD_DDRA[04] TP301 DDR_CLK_N DDR_CLK_P TP303 DDR_CKE TP304 DDR_CS_N TP304 /RAS DDR_RAS_N /CAS DDR_CAS_N LGE Internal Use Only - 100 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 101 Resolder or Replace of U301 U301 Check TP304 DDR_CS_N Resolder or Replace of U301 U301 Memory will work properly LGE Internal Use Only - 101 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 102 Solder paste Melt solder via heat-gun. Polish up Memory IC pad area for deliberate mounting Memory IC. LGE Internal Use Only - 10 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 103 3. Function test after finishing Attach gold gasket Assemble phone Function test assemble. LGE Internal Use Only - 103 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 104: Proximity Sensor On/Off Trouble Shooting
TP1 : VA607 TP2 : VA608 VPROX_3V0 U501 GP2AP002S00F R521 LEDA I2C_SCL LEDC I2C_SDA R522 VDD_IO_1V8 C534 VOUT PROX_INT EUSY0376201 LGE Internal Use Only - 104 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 105 Check IC_SCL/SDA & PROX_INT Sensor (U501) Work Well? Change the Main board Measurement VREG_MSME_1.8V VREG_PROX_.6V PROX_OUT PROX_IC_SCL / SDA LGE Internal Use Only - 105 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 115 5. DOWNLOAD LG-T370 ‘LG-T370’ LG-T370 LG-T370 LG-T370 LG-T370 LG-T370 ‘LG-T370’ LG-T370 LGE Internal Use Only - 115 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 120: Circuit Diagram
L113 GND3 GND4 0.5p HIGH RF_LB_RXP L114 HIGH HIGH 850/900 TX HIGH HIGH DCS/PCS TX HIGH HIGH HIGH - 120 - LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 121 FOR ESD (LCD - TOP Contact) CN201 X202 NX3215SA 32.768KHz JTAG_TRST_N TP205 JTAG_TDI JTAG_TMS C237 C238 TP206 JTAG_TCK TP207 JTAG_TDO RESET_N C245 - 121 - LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 122 If single SIM, R327=0ohm and U302=DNI. 2V85_VSIM C322 SIM_RST_2 SIM_DATA_2 U302 SIM_DATA SIM_RST_SEL R323 SIM_SEL 2V85_VSIM SIM_DATA_1 R325 R324 EUSY0186504 100K FSA2259UMX 100K - 122 - LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 123 TP420 VA402 VA408 TOUCH_INT No7=NC(VDDIO) TOUCH_ID GB042-10S-H10-E3000 VA407 C416 0.1u KEY_OUT2 KEY_OUT3 KEY_IN0 SEND KEY_IN1 Vol_down KEY_IN3 Vol_UP - 123 - LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 124 C531 SUMY0003816 C530 39pF OBM-410L44-RC1882 L505 EAB62429501 C532 SPK_N MAIN_MIC_N R518 C535 C536 VA502 VA503 D501 D502 C537 - 124 - LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 125 VCAM_IO_1V8 CAM_RST_N VCAM_DIG_1V8 C617 C620 7.5p 7.5p CAM_PWDN R617 F_CAM_VSYNC CAM_VSYNC C616 7.5p R618 F_CAM_HSYNC CAM_HSYNC C618 7.5p - 125 - LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 126 TP708 C713 UART_RTS_N BT_UART_CTS TP709 BTCX_TXCONF GPIO_0 UART_CTS_N BT_UART_RTS GPIO_6 TP710 BT_WAKEUP_HOST GPIO_1 HUSB_DN BT_CLK_REQ GPIO_5 HUSB_DP TP711 - 126 - LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 127: Bga Pin Map
8. BGA PIN MAP BGA IC pin check (U201) •Ball Diagram (Top View), PMB8815(A-GOLDRADIO+) : not in use LGE Internal Use Only - 17 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 128 8. BGA PIN MAP BGA IC pin check (U301) * Ball Diagram (Top View), H9DAGH1GHMMMR-46M : not in use LGE Internal Use Only - 18 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 129: Pcb Layout
CN401 :I/O conn. MIC501 -no USB Connection. -no Voice sending -no Serial Connection. -no Voice recoding CN401 MIC501 LG-T370_MAIN_EAX64678601_1.0_TOP - 129 - LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 130 CN602 : 2M Camera connector TP408 -no Camera FL604 FL605 R317 R318 C321 C319 S301 : SIM Conn. -no Sim LG-T370_MAIN_EAX64678601_1.0_BOT - 130 - LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 131: Engineering Mode
[ 3-10] Change Frequency Band [4] Call Timer [5] Factory Reset [6] MF TEST [6-1] All Auto Test LGE Internal Use Only - 131 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 132: Stand Alone Test
2. Check PC Bau Rate 3. Confirm EEPROM & Delta file prefix name 4. Click “Update Info” for communicating Phone and Test-Program LGE Internal Use Only - 13 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 133 5. For the purpose of the Standalone Test, Change the Phone to “ptest mode” and then Click the “Reset” bar. 6. Select “Non signaling” in the Quick Bar menu. Then Standalone Test setup is finished. LGE Internal Use Only - 133 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 134: Tx Test
3. Select “Tx” in the RF mode menu and “PCL” in the PA Level menu. 4. Finally, Click “Write All” bar and try the efficiency test of Phone. LGE Internal Use Only - 134 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 135: Rx Test
4. The Phone must be changed “normal mode” after finishing Test. 5. Change the Phone to “normal mode” and then Click the “Reset” bar. LGE Internal Use Only - 135 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 137: Auto Calibration
GSM phone. 12.2 Tachyon Directory 11.2 Tachyon Directory LGT370 LGT370/ LGT370 LGT370 LGT370 LGE Internal Use Only - 137 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 138: 1.3 Test Equipment Setup
11.3 Test Equipment Setup 12.3 Test Equipment Setup 11.4 Procedure 12.4 Procedure 1 .Turn on the Phone. 2. “/LGE/Tachyon/Tachyon.exe” LGT370 LGT370 LGE Internal Use Only - 138 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 139 12.AUTO CALIBRATION 11. AUTO CALIBRATION 3. Tachyon Login 4. Tachyon Main LGT370 LGE Internal Use Only - 139 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 140 12.AUTO CALIBRATION 11. AUTO CALIBRATION 5. Tachyon Loss Setting lgT370.gms lgT370.gms lgT370.gms lgT370.gms lgT370.gms LGE Internal Use Only - 140 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 141 8) Voltage Current Setting 9) Show Result Window 9) Show Result Window 10) Setting click Click after setting LGE Internal Use Only - 141 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 142 12.AUTO CALIBRATION 11. AUTO CALIBRATION (2) Click “System Option Setting” Menu (3) Report Data LGE Internal Use Only - 14 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 143 11. AUTO CALIBRATION 7. Click “User Model Selection” Menu LGT370 LGT370 LGT370 LGT370 LGT370 LGT370 LGT370 LGT370 LGT370 LGT370 LGE Internal Use Only - 143 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 144 11. AUTO CALIBRATION 8. Tachyon RF Calibration Start LGT370 9. Tachyon RF Calibration finishes. LGT370 LGT370 lgT370.gms + NewFile.grf LGE Internal Use Only - 144 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 145: 1.5 Agc
Channel PCS 1900 Frequency 1850.2 MHz 1880 MHz 1909.8 MHz Max power 29.5 dBm 29.5 dBm 29.5 dBm LGE Internal Use Only - 145 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 146: Exploded View & Replacement Part List
PCB,Sidekey EAX00 EAX01 Camera Module EBR01 Motor,DC SJMY00 Microphone,Condenser SUMY00 Rechargeable Battery,Lithium Ion SUMY00 EAC00 EAA00 Cover,Battery MCK00 - 146 - LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 147: Replacementparts
MCR64793701 MOLD PC LGT375.ATHABK ZZ:Without Color - MCQ000000 Damper MCQ66953901 COMPLEX LGT375.ATHABK ZZ:Without Color - Cover ACQ003400 ACQ86044401 LGT370.ACISBK BK:BLACK BLACK - Assembly,Bar LGE Internal Use Only - 147 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 148 COMPLEX LGT375.ATHABK ZZ:Without Color - MCQ049800 Damper,Motor MCQ66998001 COMPLEX LGT375.ATHABK ZZ:Without Color - MCQ074200 Damper,Speaker MCQ66954001 COMPLEX LGT375.ATHABK ZZ:Without Color - LGE Internal Use Only - 148 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 149 MBK63273901 Color - MDS000001 Gasket MDS64074001 COMPLEX LGT375.AVNMBK GD:Gold - MCQ049800 Damper,Motor MCQ67046101 COMPLEX LGT375.ATHABK ZZ:Without Color - LGE Internal Use Only - 149 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 150 MCK67255301 MOLD PC LGT370.ACISBK BK:BLACK BLACK - MEZ002101 Label,Approval MEZ64570001 CUTTING LAMI LGP940.ACISBK WA:White - MEZ000000 Label,Approval MEZ64188201 COMPLEX LGA190.ACISBK ZZ:Without Color - LGE Internal Use Only - 150 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 151: Main Component
MCH155A0R75C 0.75pF 0.25PF 50V NP0 - Capacitor C112 ECCH0000196 55TO+125C 1005 R/TP - ROHM Semiconductor Ceramic,Chip KOREA CORPORATION LGE Internal Use Only - 151 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 152 VA601 FL601 FL602 EVRC14S03Q030100R ESD/EMI 0HZ 15pF 0H FL603 Filter,EMI/Power SFEY0013201 SMD R/TP AMOTECH CO., LTD. FL604 FL605 LGE Internal Use Only - 15 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 153 C1005X5R1A105KT000F 1uF 10% 10V X5R - C508 Capacitor ECZH0001215 55TO+85C 1005 R/TP - TDK KOREA C601 Ceramic,Chip COOPERATION C602 C606 LGE Internal Use Only - 153 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 154 11.95x11.40x1.42t, Push-pull type MOLEX GB042-24S-H10-E3000 24P 0.40MM STRAIGHT CN602 Connector,BtoB ENBY0034201 SOCKET SMD R/TP 1M - LS Mtron Ltd. LGE Internal Use Only - 154 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 155 FEMALE SMD R/TP 1M - LS Mtron Ltd. RC0402FR-071RL 1OHM 1% 1/16W 1005 R/TP - R107 Resistor,Chip EBC61835701 YAGEO CORPORATION LGE Internal Use Only - 155 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 156 55TO+85C 1608 R/TP 0.8MM SAMSUNG Ceramic,Chip ELECTRO-MECHANICS CO., LTD. ICVN0505X150FR 5.6V 0% 360F 1.0*0.5*0.55 VA407 Varistor SEVY0004101 NONE SMD R/TP INNOCHIPS TECHNOLOGY LGE Internal Use Only - 156 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 157 1.9GHZ 8 SHIELD NONE 1.0X0.5X0.5MM R/TP Multilayer,Chip MURATA MANUFACTURING CO.,LTD. MCR01MZP5J243 24KOHM 5% 1/16W 1005 R/TP R214 Resistor,Chip ERHZ0000449 - ROHM. LGE Internal Use Only - 157 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 158 MCH153CN333KK 33nF 10% 16V X7R - C529 Capacitor ECCH0000161 55TO+125C 1005 R/TP - ROHM Semiconductor C532 Ceramic,Chip KOREA CORPORATION LGE Internal Use Only - 158 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 159 C540 D501 PESD5V0F1BL 5.5V 6V min 11V 2.5A - SOD-882 Diode,TVS EDTY0012101 D502 R/TP 2P 1 STC CORP. LGE Internal Use Only - 159 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 160 R306 - ROHM. R319 R321 R323 R202 MCR01MZP5J471 470OHM 5% 1/16W 1005 R/TP - Resistor,Chip ERHZ0000484 R307 ROHM. LGE Internal Use Only - 160 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 161 R705 MCH155A180J 18pF 5% 50V NP0 -55TO+125C Capacitor C607 ECCH0000113 1005 R/TP - ROHM Semiconductor KOREA Ceramic,Chip CORPORATION LGE Internal Use Only - 161 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 162 CL05C270JB5NNNC 27pF 5% 50V NP0 - Capacitor C502 ECCH0000117 55TO+125C 1005 R/TP 0.5 SAMSUNG ELECTRO- Ceramic,Chip MECHANICS CO., LTD. LGE Internal Use Only - 16 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 163 55TO+125C 1005 R/TP - SAMSUNG ELECTRO- C224 Ceramic,Chip MECHANICS CO., LTD. R409 MCR01MZP5F1003 100KOHM 1% 1/16W 1005 Resistor,Chip ERHZ0000204 R528 R/TP - ROHM. LGE Internal Use Only - 163 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 164 ELCH0004718 Multilayer,Chip 1.0X0.5X0.5MM R/TP PILKOR ELECTRONICS LTD. MCR01MZP5J473 47KOHM 5% 1/16W 1005 R/TP R501 Resistor,Chip ERHZ0000486 - ROHM. LGE Internal Use Only - 164 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 165 SUMY00 SUMY0003816 nser 1TO10V 4x1.0t FPCB BSE CO., LTD. RAA050100 Resin,PC BRAH0001301 UF2040 or 3075BHF . . NONE LGE Internal Use Only - 165 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 166: Accessory
STA-U35ED2 100-240V 4.8V 400mA 50-60Hz CB, EAY060000 Adapters EAY62389801 CE WALL 2P USB - DONGDO ELECTRONICS CO.,LTD LGE Internal Use Only - 166 - Copyright © 01 LG Electronics. Inc. All right reserved. Only for training and service purposes...

LG -T370 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 Engineering Mode

11 Stand Alone Test

12 Auto Calibration

13 Exploded View & Replacement Part List

Quick Links

Troubleshooting

Related Manuals for LG LG-T370

Summary of Contents for LG LG-T370

Table of Contents