Page 1 Internal Use Only Service Manual LG-A155 Date: October, 2010 / Issue 1.0...
Page 2: Table Of Contents
4.5 Charging Trouble ................67 4.6 Vibrator Trouble ................69 4.7 LCD Trouble ..................71 4.9 Speaker Trouble ................75 4.10 Earphone Trouble ..............77 - - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 4: Introduction
Therefore, note that unauthorized alternations or repair may affect the regulatory status of the system and may void any remaining warranty. - 5 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 5 • When returning system boards or parts like EEPROM to the factory, use the protective package as described. - 6 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 6: Abbreviations
International Portable User Identity Intermediate Frequency Liquid Crystal Display Low Drop Output Light Emitting Diode OPLL Offset Phase Locked Loop - 7 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 7 Time Division Multiple Access UART Universal Asynchronous Receiver/Transmitter Voltage Controlled Oscillator VCTCXO Voltage Control Temperature Compensated Crystal Oscillator Wireless Application Protocol - 8 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 8: Performance
Internal EAR Phone Jack PC Synchronization Speech coding EFR/FR/HR Data and Fax Vibrator Loud Speaker Voice Recoding Microphone - 9 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 9 Bluetooth version 2.1 / 76~108MHz supported Camera 0.3M Bluetooth / FM Radio Bluetooth version 2.1 / 76~108MHz supported - 10 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 10: Technical Specification
Power Toler. 30dBm 14dBm 28dBm 12dBm 26dBm 10dBm 24dBm 8dBm 22dBm 6dBm 20dBm 4dBm 18dBm 2dBm 16dBm 0dBm - 11 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 11 6,000 GSM850/ EGSM Offset from Carrier (kHz). Max. dBm Output RF Spectrum (due to switching transient) 1,200 1,800 - 12 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 12 3 dB 8 3 dB Frequency (Hz) Max.(dB) Min.(dB) 1,000 Sending Response 2,000 3,000 3,400 4,000 2 3 dB - 1 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 13 At least 65 dBspl under below conditions: Ringer Volume 1. Ringer set as ringer. 2. Test distance set as 50 cm - 14 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 14 Battery full charge voltage = 4.2 V Capacity: 800mAh Switching-mode charger Travel Charger Input: 100 ~ 350V, 50/60 Hz Output: 5.1 V, 400 mA - 15 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 15: Technical Brief
3.1 Digital Main Processor 3.1 Digital Main Processor Figure. 3.1.1 MT6253 Hardware Block Diagram Figure. 3.1.1 MT6253 Hardware Block Diagram - 16 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 16: External Memory Interface
• Alerter Output with Enhanced PWM or PDM • Maximum 7 external interrupt lines 3.1.5 Security • Support security key and 128bit chip unique ID - 17 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 17 • Fully integrated channel filter with f3dB=150kHs • 95dB gain with 60dB gain control range • No IIP2 calibration - 18 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 18 • GSM channel coding, equalization and A5/1, A5/2 and A5/3 ciphering • GPRS GEA1, GEA2 and GEA3 ciphering - 19 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 19: Lcd Interface
• Analog multiplexer for Stereo Audio • FM Radio Recording • Stereo to Mono Conversion • HE-AAC decode support - 20 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 20: Power Management
RF circuitry of the handset. The LDO is optimized for high performance and adequate quiescent current. - 21 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 21 SIM level shifter circuitry in the handset. The Vsim LDO is controlled independently by the register named VSIM_EN. - 22 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 22 VCAMD_SEL[1:0]. It supplies the digital power of the camera module. Vcamd is controlled independently by the register named RG_VCAMD_EN. - 2 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 23 3. TECHNICAL BRIEF 3. TECHNICAL BRIEF Table3.2.1. Power Supply Domains (Without RF) - 24 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 24 MT6253 as well as main power states provided by the PMIC are shown in Figure.3.2.1. Figure 3.2.1. Major Phone Power States and Operating Modes for MT6253 based terminal 3.2.2 - 25 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 25: Fem With Integrated Power Amplifier Module
Transistor (HBT) PA blocks are fabricated onto a single Gallium Arsenide (GaAs) die. One PA block supports the GSM850/900 bands and the other PA block supports the DCS1800/PCS1900 bands. - 26 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 26 GSM850 C346 GSM_IN GSM_OUT GND6 GND16 C316 C325 GND7 GND15 PGND6 PGND5 PGND4 Figure 3.3.2 TX-module CIRCUIT DIAGRAM - 27 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 27: Clocks
FREF C103 4.7u AU_VCM CHG_EN TSX-3225 26MHZ_7_4PF 26MHz XTAL1 XTAL2_GND X102 AVDD_RTC Figure. 3.4.2 Crystal Oscillator External Connection - 28 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 28 However the penalty is losing a little system efficiency for switching on and off bus clock, but the impact is small - 29 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 29: Rfsys Of Mt625 (U102)
- Fully integrated channel filter with f =150kHz - 95 dB gain with 60 dB gain control range - 0 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 30 -On-chip programmable capacitor array for coarse tune - On-chip programmable capacitor array for fine tune RFSYS in a-QFN package - 1 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 31: Memory(Pf8F4050M0YDe, U101)
(legacy-latching) on some litho/density combinations and up to 133 MHz using CLK address-latching only on some litho/density combinations. It is listed below in the following table Figure. 3.6.1 MEMORY BLOCK DIAGRAM - 2 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 32 • Deep Power-Down (DPD) mode: DPD provides the lowest power consumption and is enabled by programming in the Enhanced Configuration Register. DPD is initiated by asserting the DPD pin. - - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 33 -Automated Blank Check Mode Flash Software -Numonyx™ FDI and Numonyx™ PSM -Common Flash Interface -Basic and Extended Flash Command Set - 4 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 34: Bt Module
MT6612 is a highly integrated Bluetooth platform IC. It includes powerful baseband processing capabilities with rich features and a high performance transceiver, all in a compact single package. - 5 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 35 - Supports a SPI interface to access external serial flash and EEPROM. - Embedded 128-bit eFuse for Bluetooth Address use. - 6 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 36 MT6612. In sleep mode, the system could be awakened after sleep time expired or by an external wake up signal from the host controller. - 7 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 37 MT6612 features self calibration schemes to compensate the process and temperature variation to maintain high performance. Those calibrations are performed automatically right after system boot-up. - 8 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 38: Sim Card Interface
ENBY0039601 GB042-20S-H10-E3000 C263 C262 C261 C265 C206 C264 D205 C205 D206 D207 Figure 3.8.1 SIM Connector Circuit Diagram - 9 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 39 SIMRST is used as the SIM card reset signal. Besides, SIMDATA and SIMCLK are used for data exchange purpose Figure 3.8.2 SIM Interface block diagram - 40 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 40: Micro-Sd Card Interface
MMC bus under control of proper firmware. Furthermore, the controller also support SDIO card specification version 1.0 partially. However, the controller can only be configured as either the host controller. - 41 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 41 Write Protection Switch on SD/MMC Memory Card. Table 3.9.1 Sharing of pins for Memory Stick and SD/MMC Memory Card controller - 42 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 42 “INS” will connect to the pin “VSS2” of a SD/MMC connector. Figure 3.9.2 Card Detection for SD/MMC Memory Card - 4 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 44 1.1V to 3.3V by I2C interface. The outputs of LDO offer 3% accuracy and low dropout voltage of 250mV @ 300mA. The LDO also provides current limiting and output short circuit thermal folded back protection. - 45 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 45: Battery Charger Interface
The RT9524 is available in a WDFN-10L 2x3 package to achieve optimized solution for PCB space and thermal considerations. 47/140 - 46 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 46: Keypad Interface
KB417 KEY_ROW4 STAR NUM 0 SHARP SEND KB410 KB411 KB416 KB401 KEY_ROW1 Figure 3.12.1 MAIN KEY STRUCTURE 48/140 - 47 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 47 APB read command. The status register can only be changed by the key-pressed detection FSM. Figure 3.12.2 6x7 matrix with one power-key - 48 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 48 Figure 3.12.3 One key pressed with de-bounce mechanism denoted Figure 3.12.4 Two keys pressed, case 1 (b) Two keys pressed, case 2 - 49 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 49: Audio Front-End
The Digital Audio Interface (DAI) block communicates with the System Simulator for FTA or external Bluetooth modules. 51/140 - 50 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 50 PCM interface. Note that the serial data changes when the clock is rising and is latched when the clock is falling. - 51 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 51 Figure 3.13.4 Block diagram of digital circuit of audio front end Figure 3.13.5 Block diagram of digital circuit of audio front end 53/140 - 52 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 52: Key Baclklight Led Interface
The keypad LED can sink 150mA and will become high impedance as disabled. VBAT LD401 LD400 EDLH0013401 EDLH0013401 R407 R408 VA405 VA404 KEYPAD_LED Figure 3.14.1 Key Backlight Block - 5 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 53: Vibrator Interface
VIBRATOR signal of MT625 with only ON/OFF function. VBAT D403 VIB_N R414 Q400 VIBRATOR R416 R415 100K Figure 3.15.1 Vibrator Driver Block - 54 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 54: Trouble Shooting
PF38F4050M0Y3DF U102 Main Chip (MT6253) U302 Bluetooth Chip (MT6612) U303 TX Module (SKY77547) X102 Crystal, 26MHz Clock 58/140 - 55 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 55: Rx Trouble
(2) Check (page53) Mobile SW &TX module (3) Check PLL Control Re-download SW or Do calibration again 59/140 - 56 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 56 Figure 4.2.1 CIRCUIT WAVEFORM BT_CLK26M FREF C103 4.7u AU_VCM CHG_EN TSX-3225 26MHZ_7_4PF 26MHz XTAL1 XTAL2_GND X102 AVDD_RTC 60/140 - 57 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 57 U303 EGSM GND17 SKY77547 GSM850 C346 GSM_IN GSM_OUT GND6 GND16 GND7 GND15 C316 C325 PGND6 PGND5 PGND4 61/140 - 58 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 58 Replace TX module (U303) Signal is OK ? EGSM Rx Mobile SW & TX Module is OK. 62/140 - 59 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 59: Tx Trouble
Crystal Circuit (2) Check Mobile SW &Tx module (3) Check PLL Control Redownload SW or Do calibration again - 60 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 60 Figure 4.3.1 CIRCUIT WAVEFORM BT_CLK26M FREF C103 4.7u AU_VCM CHG_EN TSX-3225 26MHZ_7_4PF 26MHz XTAL1 XTAL2_GND X102 AVDD_RTC 1 pin - 61 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 61 EGSM GND17 SKY77547 GSM850 C346 GSM_OUT GSM_IN GND6 GND16 C316 C325 GND7 GND15 PGND6 PGND5 PA_EN PGND4 SIM2 - 62 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 62 Replace TX module (U303) TP11 signal same Replace SW301 as TP1? EGSM Tx Mobile SW & TX module is OK. - 6 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 63: Power On Trouble
TP3(VRF) TP2(VTCXO) TP6(VIO) TP5(VM) TP4(VA) TP1(VCORE_PMU) U102 Figure 4.4.1 R101=0ohm Figure 4.4.2 Figure 4.4.3 Remote power on 67/140 - 64 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 64 C148 4.7u 0.1u TP2 TP TP4 TP6 TP7 TP8 TP9 TP10 TP11 Figure 4.4.4 Power Block of LG-A155 - 65 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 65 Is the phone power on? Re-download software Does it work properly? The phone will Replace the main board Properly operating. 69/140 - 66 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 66: Charging Trouble
GND2 IEOC EN_SET CHG_EN EUSY0410801 R209 C211 R239 C222 R208 0.1u 3000ohm,1/16W,F,1005,R/TP 820 ohm,1/16W ,F ,1005 ,R/TP 70/140 - 67 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 67 Pin 10 of RT9524 = 4.9V U201 Battery is charged? Replace the main board Charging is properly operating - 68 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 68: Vibrator Trouble
Figure 4.6 CIRCUIT VBAT D403 Main IC (U102) VIB_N Main IC R414 VIBRATOR Q400 (U102) R416 R415 100K 72/140 - 69 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 69 (+) high? Is the voltage at TP1 Replace the U102 (+) high? Replace vibrator Vibrator Working well ! 73/140 - 70 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 70: Lcd Trouble
4. TROUBLE SHOOTING 4. TROUBLE SHOOTING 4.7 LCD Trouble TEST POINT TP1 (CN401) Figure 4.7.1 74/140 - 71 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 71 LED2 LED_CA3 I2C_SDA2 LED3 I2C_SCL2 LED4 C416 C417 C418 C414 C415 C413 C410 2.2u 2.2u C412 C411 75/140 - 72 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 72 LCD_BACKLIGHT_CTRT : I2C DATA Graph 4.7.1. LCD Backlight Control Signal Waveform LCD_RS LCD_CS LCD_WR Graph 4.7.2. LCD Data Waveform 76/140 - 7 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 73 Check the Waveform of (TP2,TP3,TP4) EMI filter ? Does LCD work Replace LCD module properly ? LCD working well ! 77/140 - 74 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 74: Speaker Trouble
KEY_ROW2 KROW1_GPIO12 KEY_ROW1 KROW0_GPIO13 KEY_ROW0 R123 R124 UTXD1 UART_TXD 2.2K 2.2K URXD1 UART_RXD URTS1_B_GPIO25 I2C_SDA1 UCTS1_B_GPIO24 I2C_SCL1 82/140 - 75 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 75 Check the Audio signal Check the Audio signal Change the U102 Speaker Speaker Working well!! Working well!! 83/140 - 76 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 76: Earphone Trouble
TP11 C239 ISET 100K 2.2u L201 C241 D210 C224 C244 270n I2C_SCL1 TP10 I2C_SDA1 R215 L202 MUIC_INT 2.2K - 77 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 77: Only For Training And Service Purposes
TP6,TP7,TP8,TP9, voice from voice from and try again TP10,TP11,TP12 the earphone? the earphone? Earphone will work properly 85/140 - 78 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 78: Receiver Trouble
C152 C153 SPK1_N R117 5.1K PAD_VRT USB_DP USB_DM CN501 R500 RCV_N R501 RCV_P VA500 C501 C500 VA501 86/140 - 79 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 79 Does waveform at Replace/Change the U102 TP2 Fluctuate? Is receiver connected Change the receiver Properly? Receiver will work properly. 87/140 - 80 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 80: Microphone Trouble
R411 MAIN_MICP 0.1u C404 C420 R412 MIC401 MAIN_MICN 0.1u VA401 C421 C422 VA402 R418 SEVY0005402 2.2K R410 88/140 - 81 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 81 Is it a few tens mV AC? Check the soldering of Resolder component TP3,TP4,TP5,TP6,TP7 Microphone will work properly. 89/140 - 82 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 82 DAT0 MMC_DATA0 VSS_2 CLK2 MMC_CLK S500 MMC_CMD MMC_DATA3 CD_DAT3_2 DAT2 MMC_DATA2 MMC_DET DETECT COMMON C503 C502 4.7u 90/140 - 8 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 83 Does it work Does it work Properly? Properly? SIM card is SIM card is properly working properly working. 91/140 - 84 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 84: Sim2 Card Interface Trouble
VSIM2 VSIM2 J201 R202 SIM2_RST SIM2_DATA SIM2_CLK GND4 GND1 GND3 GND2 C201 D202 C204 D203 C202 C203 D204 - 85 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 85 Does it work Does it work Properly? Properly? SIM card is SIM card is properly working properly working. 93/140 - 86 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 86: Key Backlight Trouble
4. TROUBLE SHOOTING 4. TROUBLE SHOOTING 4.14 KEY backlight Trouble TEST POINT Figure 4.14.1 - 87 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 87 TP1, TP2 = Low ? Backlight will Replace or resolder work properly. TP1 or TP2 or LED 95/140 - 88 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 88: Micro Sd (Usd) Trouble
MMC_DATA2 MMC_DET VIB_P MMC_CMD MMC_DATA3 VIB_N ENBY0039601 GB042-20S-H10-E3000 C263 C262 C261 C265 C206 C264 D205 C205 D206 D207 - 89 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 89 MC_CLK & Data Re-download SW Timing OK? Replace Micro SD Card Micro SD Card will work properly 97/140 - 90 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 90: Bluetooth Trouble
BT_PCMCLK PCMCLK R313 PCMSYNC BT_PCMSYNC TP306 PCMOUT BT_PCMIN TP307 PCMIN BT_PCMOUT JTCK JTRST_B JTDI JTMS JTDO JRTCK 98/140 - 91 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 91 VBAT at TP4 Check Bias Voltage Replace BT_2V8 at TP5 Replace TP8 Check TP7 BT will work properly 99/140 - 92 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 92: Fm Radio Trouble
C313 3.3p 3.3p C223 R308 FM_ANT R306 FM_32K FM_RST C314 R304 L201 C241 D210 100n 100K 270n 100/140 - 9 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 93 Check F Input & output signal at I2C(TP6) Replace U102 A condition is good? FM_radio will work properly 101/140 - 94 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 103 5. DOWNLOAD LG-A155 ‘LG-A155’ LG-A155 LG-A155 LG-A155 LG-A155 LG-A155 ‘LG-A155’ LG-A155 - 104 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 107: Block Diagram
6. BLOCK DIAGRAM 6.Block Diagram 6. BLOCK DIAGRAM 6. Block Diagram LGE Internal Use Only - 108 - Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 108: Circuit Diagram
LOW : DEMUX HIGH : MUX OJ100 OJ101 URXD UTXD UART_RXD TP106 TP103 UART_TXD TP104 F_MODE TP105 V_BUS Copyright © 2010 LG Electronics. Inc. All right reserved. - 109 - LGE Internal Use Only Only for training and service purposes...
Page 109 C205 D207 D206 FL201 ICVE10184E150R500FR CAM_DATA04 INOUT_A1 INOUT_B1 CAM_DATA05 INOUT_A2 INOUT_B2 CAM_DATA06 INOUT_A3 INOUT_B3 CAM_DATA07 INOUT_A4 INOUT_B4 15pF LGE Internal Use Only - 110 - Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 110 PCS1900N C312 L310 C322 C313 VA300 1960MHz 3.3p 3.3p ZD301 R308 R306 FM_32K FM_RST C314 R304 100K 100n Copyright © 2010 LG Electronics. Inc. All right reserved. - 111 - LGE Internal Use Only Only for training and service purposes...
Page 111 SHARP SEND 100u 0.1u KB410 KB411 KB416 KB401 VA401 C421 C422 VA402 R418 2.2K SEVY0005402 EMD2,5.1V,150mW,R/TP KEY_ROW1 R410 LGE Internal Use Only - 112 - Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 112 RCV_N VIB_N RCV_P MMC_DET DETECT COMMON GB042-20S-H10-E3000 C503 C502 4.7u VB500 VIB_P VIB_N CN502 ANT500 ZD501 C504 EDTY0009601 Copyright © 2010 LG Electronics. Inc. All right reserved. - 113 - LGE Internal Use Only Only for training and service purposes...
Page 113 MMC_CLK MMC_DATA3 MMC_DATA2 MMC_DATA2 SIM1_CLK MMC_DET MMC_DET SIM1_DATA MMC_CMD VIB_P MMC_DATA3 VIB_N VIB_P RCV_N VIB_N RCV_P GB042-20P-H10-E3000 GB042-20P-H10-E3000 LGE Internal Use Only - 114 - Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 114: Bga Pin Map
8.5 BGA PIN MAP (Top View) 8. BGA PIN MAP BGA IC pin check (U102) : not in use - 115 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 115 8. BGA PIN MAP 8.PCB LAYOUT BGA IC pin check (U101) Ball Diagram (Top View), PF38F4050M0Y3DF : not in use - 116 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 116: Pcb Layout
KB422 KB402 KB417 KB401 KB423 KB407 KB404 KB406 KB405 KB408 KB414 KB413 KB409 KB415 KB412 KB416 KB411 LG-A155_MAIN_SPFY0236101-1.0_TOP Copyright © 2010 LG Electronics. Inc. All right reserved. - 117 - LGE Internal Use Only Only for training and service purposes...
Page 117 SW301(mobile switch) - Can’t make a call - Tx Low power - Not good BER - No Service LG-A155_MAIN_SPFY0236101-1.0_BOT LGE Internal Use Only - 118 - Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 118 9. PCB LAYOUT CN501 - No Receiver CN500 - No u-SD Memory CN500 - No Receiver - No Vibrator LG-A155_SUB_SPJY0086501-1.0_PLACE_TOP Copyright © 2010 LG Electronics. Inc. All right reserved. - 119 - LGE Internal Use Only Only for training and service purposes...
Page 119 9. PCB LAYOUT CN502 - No FM RADIO VB500 - No Vibrator LG-A155_SUB_SPJY0086501-1.0_PLACE_BOT LGE Internal Use Only - 120 - Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 120 9. PCB LAYOUT LG-A155_FPCB_SPCY0261001-1.0_PLACE_TOP LG-A155_FPCB_SPCY0261001-1.0_PLACE_BOT Copyright © 2010 LG Electronics. Inc. All right reserved. - 121 - LGE Internal Use Only Only for training and service purposes...
Page 122: Engineering Mode
[3-1]E serial NO [3-2]UA string [3-3]Unlock SIM [3-4]DB check [4]Factory reset [5]Version [5-1]Main SW [6]U [6]Usage info [6-1]Call timer 109/121 - 12 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 123 [8-10]Aging test [10-6-3]API + Error [10 6 3]API + Error [9]Wise debug [9]Wise debug [10-7]Watch dog [10-7-1]Enable [10-7-2]Disable 110/121 - 124 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 124: Rf Calibration
11.1 Configuration of Tachyon 11.1.1 Configuration of directory LG-A155/ LG-A155 LG-A155 LG-A155 LG-A155 LG-A155 - 125 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes The People Company Challenge 2 / 6...
Page 125 It is written when ‘cal&auto’ is begun. ‘MODEL NAME’_Sequence.XML It is described a testing procedures. - 126 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes The People Company Challenge 3 / 6...
Page 126: How To Use Tachyon
Follow the procedure before start calibration & auto test a. Click the icon, in tool bar. Then, You can make a choice of LG-A165 for loading cfg files before run. LG-A155 b. Select model name and then do double-click the buyer name.
Page 127 3) RF Auto test 4) After action - Phone reset - Change UE to AMSS - 128 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes The People Company Challenge...
Page 128: Exploded View & Replacement Part List
Dome Assembly,Metal MCBA00 Can,Shield SACY00 PCB Assembly,Flexible SNMF00 SUMY00 Microphone,Condenser SVLM00 LCD Module SBPL00 SUMY00 ADCA00 SNMF00 Antenna,Helical Copyright © 2010 LG Electronics. Inc. All right reserved. - 129 - LGE Internal Use Only Only for training and service purposes...
Page 130: Replacement Parts
(empty), , , , , COMPLEX LG-A155 INDGG ZZ:Without Color COMPLEX, MFBZ00 Filter MFBZ0030101 (empty), , , , , - 11 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 131 (empty), , , , , COMPLEX LG-A155 INDGG ZZ:Without Color COMPLEX, MTAZ03 Tape MTAZ0361501 (empty), , , , , - 12 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 132 COMPLEX LG-A155 INDGG ZZ:Without Color COMPLEX, MPBZ00 Damper MPBZ0343001 (empty), , , , , COMPLEX LG-A165 INDKV ZZ:Without Color CN502 Contact MCIZ0009501 PRESS,BeCu, - 1 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 133: Main Component
Rclamp0521P.TCT 5V 6 5V 4A 100W - R/TP 2P 1 ZD501 Diode,TVS EDTY0009601 SEMTECH CORPORATION 49619-1611 49619-1611,16,ANGLE mm HANKOOK S500 Card Socket ENSY0022801 MOLEX - 14 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 134 C319 Capacitor,Ceramic, MCH155CN332KK 3.3nF 10% 50V X7R -55TO+125C 1005 C207,C208 ECCH0000149 Chip R/TP - ROHM Semiconductor KOREA CORPORATION - 15 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 135 Capacitor,Ceramic, C1005C0G1H330JT000F 33pF 5% 50V NP0 -55TO+125C C346,C415, ECZH0000830 Chip 1005 R/TP - TDK KOREA COOPERATION C416,C417, C418 - 16 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 136 LQW15AN27NG00D 27NH 2% 0V 280mA 0.52OHM Inductor,Multilayer, L202 ELCH0012501 3.5GHZ 25 NON SHIELD 1 1.0X0.5X0.5MM R/TP Chip MURATA MANUFACTURING CO.,LTD. - 17 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 137 ROHM Semiconductor KOREA CORPORATION MCR01MZP5F5102 51KOHM 1% 1/16W 1005 R/TP - R320 Resistor,Chip ERHZ0000295 ROHM Semiconductor KOREA CORPORATION - 18 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 138 INSTRUMENTS INCO. SI4704-D50-GMR QFN ,20 ,R/TP ,FM Tuner(No U301 IC,Tuner EUSY0430601 RDS),Internal FM Ant,3*3*0.6,110nm,0.5p ,; ,IC,Tuner SILICON LABORATORIES - 19 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 139 SDBTPTR3015 SINGLE -5DB 50OHM 5 PARTRON ANT303 Antenna,Helical SNMF0051501 COMPANY LIMITED PCB Assembly, SAFD00 LG-A155 INDGG MAIN,B SAFD0157601 Main,SMT Top - 140 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 140 SEMICONDUCTOR CO.,LTD SPFY0236101 FR-4 Multi MULTI-6 0.8 LG-A165 SPFY PCB,Main SPFY0236101 INDKV,MAIN,D,FR-4,0.8 mm,MULTI-6 UNITECH PRINTED CIRCUIT BOARD CORP. - 141 - Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 141: Accessory
ALL 2P,USB, SUNLIN ELECTRONICS CO.,LTD STA-U34IS 100-240V,5060 Hz,5.1 V,0.7 A,CE,AC-DC ADAPTOR,150Vac~350Vac,4.75Vdc~5.25Vdc,700mA,5060 EAY060000 Adapters *S*SSAD0032603 ,WALL 2P,USB,150Vac~350Vac,4.75Vdc~5.25Vdc,700mA,5060,W ALL 2P,USB, SALCOMP OY - 142 - LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved. Only for training and service purposes...

LG -A155 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 Rf Calibration

Exploded View & Replacement Part List

Quick Links

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Summary of Contents for LG LG-A155

Table of Contents