hit counter code
LG A175 Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Cell Phone
  5. A175
  6. Service manual
LG A175 Service Manual

LG A175 Service Manual

Hide thumbs
Table of Contents

Advertisement

Available languages

Available languages

Quick Links

Download this manual
Internal Use Only
Service Manual
LG-A175
Date: March, 2011 / Issue 1.0

Advertisement

Table of Contents
loading

Related Manuals for LG A175

Summary of Contents for LG A175

  • Page 1 Internal Use Only Service Manual LG-A175 Date: March, 2011 / Issue 1.0...

  • Page 2: Table Of Contents

    4.8 Speaker Trouble ..................73 4.9 Earphone Trouble .................. 76 4.10 Microphone Trouble ................79 4.11 SIM Card Interface Trouble .............. 81 LGE Internal Use Only -  - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 3: Introduction

    Therefore, note that unauthorized alternations or repair may affect the regulatory status of the system and may void any remaining warranty. 4/110 LGE Internal Use Only - 3 - Copyright © 011 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. 5/110 LGE Internal Use Only - 4 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 5: Abbreviations

    International Portable User Identity Intermediate Frequency Liquid Crystal Display Low Drop Output Light Emitting Diode OPLL Offset Phase Locked Loop 6/110 LGE Internal Use Only - 5 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 6 UART Universal Asynchronous Receiver/Transmitter Voltage Controlled Oscillator VCTCXO Voltage Control Temperature Compensated Crystal Oscillator Wireless Application Protocol 7/110 LGE Internal Use Only - 6 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 7: Performance

    Not Support Speech coding EFR/FR/HR Data and Fax Not Support Vibrator Loud Speaker Voice Recoding Not Support Microphone 8/110 LGE Internal Use Only - 7 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 8 Comment Speaker/Receiver 18x12 Speaker/ Receiver Travel Adapter MIDI 32 poly Camera Not Support FM Radio 87~108MHz supported 9/110 LGE Internal Use Only - 8 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 9: Technical Specification

    Toler. 30dBm 14dBm 28dBm 12dBm 26dBm 10dBm 24dBm 8dBm 22dBm 6dBm 20dBm 4dBm 18dBm 2dBm 16dBm 0dBm 10/110 LGE Internal Use Only - 9 - Copyright © 011 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) 1,200 1,800 11/110 LGE Internal Use Only - 10 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 11 14 4 dB Frequency (Hz) Max.(dB) Min.(dB) 1,000 Sending Response 2,000 3,000 3,400 4,000 2 3 dB 12/110 LGE Internal Use Only - 11 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 12 2. Test distance set as 50 cm Fast Charge : Typ. 410 mA Charge Current Total Charging Time : < 3.5 hours 13/110 LGE Internal Use Only - 1 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 13 Capacity: 950mAh Switching-mode charger Travel Charger Input: 100 ~ 240V, 50/60 Hz Output: 4.8 V, 400 mA 14/110 LGE Internal Use Only - 13 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 14: Technical Brief

    3. TECHNICAL BRIEF 3. TECHNICAL BRIEF 3.1 Digital Main Processor Figure. 3.1.1 X-Gold tm 110 Hardware Block Diagram 15/110 LGE Internal Use Only - 14 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 15 – PWM source to drive vibrator – Keypad and display backlight supported. – HASH Unit support for hashing. 16/110 LGE Internal Use Only - 15 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 16 Bus Interconnections The interconnection between the X-Bus and the TEAKlite Bus uses: • Multicore Synchronization • Shared Memory. 17/110 LGE Internal Use Only - 16 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 17 – Color conversion YUV -> RGB – 2D vector graphics (Lines, filled rectangles, Bit block transfer (e.g. sprites, scrolling, antialiased bitmap fonts) 18/110 LGE Internal Use Only - 17 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 18: Power Management

    (via LDO LCORE), parts of the mixed signal macro, parts of the RF macro and the external memory if a 1.8V memory is used. 19/110 LGE Internal Use Only - 18 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 19 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. 20/110 LGE Internal Use Only - 19 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 20 3. TECHNICAL BRIEF 3. TECHNICAL BRIEF Table. 3-2-1 Power supply Domains (without RF) 21/110 LGE Internal Use Only - 0 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 21 DCXO etc.) and controlled by the VCXO_enable signal. The reason for the startup is stored in the ResetSourceRead register. Battery Measurement 22/110 LGE Internal Use Only - 1 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 22 If the charger unit is running the ADC is controlled by the charger state-machine Figure.3.2.1 First Part of the State Machine, Running in Different Power Domains than the Second Part 23/110 LGE Internal Use Only -  - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 23 3. TECHNICAL BRIEF Figure 3.2.2 Second (Main) Part of the Startup State Machine in the VPMU Domain 24/110 LGE Internal Use Only - 3 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 24 AC supply frequency. reasons 25/110 LGE Internal Use Only - 4 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 25 This allows to power up the LCORE core regulator and wait for the core to reach reset state before powering up the I/O supply regulators. 26/110 LGE Internal Use Only - 5 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 26 3. TECHNICAL BRIEF 3. TECHNICAL BRIEF Figure 3.2.3 Start Up Sequence (triggered by First Connect Event) 27/110 LGE Internal Use Only - 6 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 27 OFF mode. This is done via the SHUTDOWN state of the PMU state machine. (see chapter switch OFF) 28/110 LGE Internal Use Only - 7 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 28 10 MHz. This oscillator is running during charging and during battery measurements triggered by the PMU. It is off otherwise. 29/110 LGE Internal Use Only - 8 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 29 PMU clock to the 32 kHz clock to archive the target OFF current 30/110 LGE Internal Use Only - 9 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 30: Fem With Integrated Power Amplifier Module

    Gallium Arsenide (GaAs) die. One PA block supports the GSM900 band and the other PA block supports the DCS1800 band. Both PA blocks share common power supply pads to distribute current. 31/110 LGE Internal Use Only - 30 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 31 1.5n IN CASE OF GSM850/PCS1900 CHANGE THIS MODULE TO PART_NO SMRH0005901(SKY77543) 1.2p Figure 3.3.3 FEM CIRCUIT DIAGRAM 32/110 LGE Internal Use Only - 31 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 32: Crystal(6 Mhz, X101)

    Figure. 3.4.1 Crystal Oscillator External Connection 3.5 RF Subsystem of PMB8810 (U101) Figure. 3-5-1 Block DIAGRAM of RF Subsystem 33/110 LGE Internal Use Only - 3 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 33: Functional Description

    The analog section of the receiver contains two LNAs, quadrature mixer, low-pass filter, and a high resolution continuous-time delta-sigma analog-to-digital converter. Figure. 3.5.2 RECEIVER CHAIN BLOCK DIAGRAM 34/110 LGE Internal Use Only - 33 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 34 This reference signal frequency serves as the comparison frequency for the phase detector and provides the digital circuitry with a clock signal. 35/110 LGE Internal Use Only - 34 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 35 A minor set of power amplifiers require a bias voltage to enhance power efficiency. Support of this power amplifiers is achieved by the implemented bias DAC. Figure. 3.5.4 PA AND FEM CONTROL BLOCK DIAGRAM 36/110 LGE Internal Use Only - 35 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 36: Memory(M36W0R5040U6S, U10)

    Recommended operating conditions do not allow more than one memory to be active at the same time. 37/110 LGE Internal Use Only - 36 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 37 Therefore, it is recommended to put the other device in the high impedance state when reading the selected device. 38/110 LGE Internal Use Only - 37 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 38: Sim Card Interface

    This signal makes SIM card to HW default status. SIM_CLK This signal is transferred to SIM card. SIM_DATA This signal is interface datum. 39/110 LGE Internal Use Only - 38 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 39: Lcd Interface

    LCD driver for medium or small size portable products such as digital cellular phones, smart phone, MP3 and PMP where long battery life is a major concern. 40/110 LGE Internal Use Only - 39 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 40 • 10% LED Output Current Accuracy • 3% LED Output Current Matching • Low-Current Shutdown Mode • Built-in Thermal Protection 41/110 LGE Internal Use Only - 40 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 41: Battery Charger Interface

    The other features are under voltage protection, over voltage protection for VIN supply and thermal protection of battery temperature. 42/110 LGE Internal Use Only - 41 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 42: Keypad Interface

    KEY_OUT3 C319 DOWN KEY_OUT4 C328 KEY_IN0 KEY_IN1 KEY_IN2 KEY_IN3 KEY_IN4 NOT SMT Figure 3.10.1 MAIN KEY STRUCTURE 43/110 LGE Internal Use Only - 4 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 43 (or key combination) that was pressed and how long it was pressed. Figure 3.10.2 Block Diagram and System Integration of the KPD 44/110 LGE Internal Use Only - 43 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 44: Audio Front-End

    • Analog part The following figure shows an architecture overview of the Audio section. Figure 3.11.1 Audio Section Overview 45/110 LGE Internal Use Only - 44 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 45 100% by Firmware. • The high-pass functions of the voiceband filters have to be implemented in firmware on TEAKLite®. 46/110 LGE Internal Use Only - 45 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 46 Loudspeaker driver, b) one mono, differential Earpiece driver and c) one stereo, single-ended (with uni- or bipolar signals), Headset driver. 47/110 LGE Internal Use Only - 46 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 47 The buffers are designed to be short circuit protected. Figure 3.11.3 Switching for R/L DACs onto Buffers 48/110 LGE Internal Use Only - 47 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 48 To improve SNR the sample frequency can be doubled in dedicated modes and the modulated data stream is 4MHz instead of 2 MHz. 49/110 LGE Internal Use Only - 48 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 49 VMIC can be used for supplying this microphone. Figure 3.11.5 Typical Microphone Supply Generation (alternative) 50/110 LGE Internal Use Only - 49 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 50: Key Baclklight Led Interface

    LD305 LD306 LD307 LD308 LD309 LD310 R346 Q301 KEY_BACKLIGHT 10Kohms C346 2.2u Figure 3.12.1 Key Backlight Block 51/110 LGE Internal Use Only - 50 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 51: Vibrator Interface

    MLED2 MLED1 Figure 3.13.2 Vibrator Driver Block LCD_CS_N MEM_WR_N LCD_RST_N_1.8 52/110 MEM_A_[16] C349 C335 C336 C345 15pF LGE Internal Use Only - 51 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes (10V)

  • Page 52: Hall Ic

    Therefore, to see whether the opening of the slide. VIO_1V8 VIO_1V8 HALL_SENS_DET Figure 3.14.1 Hall Sensor block 53/110 LGE Internal Use Only - 5 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 53: Trouble Shooting

    X101 Figure 4.1 U101 Main Chip (EGV3) U401 Tx Module FL401 SAW Filter X101 Crystal, 26MHz Clock 55/110 LGE Internal Use Only - 53 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 54: Rx Trouble

    Crystal Circuit Check(2) Mobile SW & TX module Check(3) PLL Control Re-download SW or Do calibration again 56/110 LGE Internal Use Only - 54 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 55 Figure 4.2.1 CIRCUIT WAVEFORM FMRIN FM_ANT X101 DSX321G-26M FMRINX 26MHz RX12 RF_GSM_RXP RX12X RF_GSM_RXN Figure 4.2.2 Figure 4.2.3 57/110 LGE Internal Use Only - 55 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 56 IN CASE OF GSM850/PCS1900 CHANGE THIS MODULE CHANGE THIS MODULE TO PART_NO SMRH0005901(SKY77543) 1.2p TO PART_NO SMRH0005901(SKY77543) 1.2p LGE Internal Use Only - 56 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 57 Replace U401 TP2 signal same as Replace SW401 TP1? EGSM RX Mobile SW & FEM is OK. 59/110 LGE Internal Use Only - 57 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 58: Tx Trouble

    Crystal Circuit (2) Check Mobile SW &FEM (3) Check PLL Control Redownload SW or Do calibration again 60/110 LGE Internal Use Only - 58 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 59 1 pin RX12 RF_GSM_RXP RX12X RF_GSM_RXN 1 pin Figure 4.3.2 Figure 4.3.3 Figure 4.3.2 Figure 4.3.3 61/110 61/110 LGE Internal Use Only - 59 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 60 GND1 PGND15 RF_DCSPCS_OUT 2.2nH 2.2nH 1.5n IN CASE OF GSM850/PCS1900 62/110 CHANGE THIS MODULE TO PART_NO SMRH0005901(SKY77543) 1.2p LGE Internal Use Only - 60 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 61 Replace FL401 or U401 is OK ? Mobile SW & TX Module and Saw Filter is EGSM TX 63/110 LGE Internal Use Only - 61 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 62: Power On Trouble

    U101 U102 X101 Figure 4.4.1 R104 RPWRON END_KEY R105 100Kohms Figure 4.4.2 Figure 4.4.3 Remote power on 64/110 LGE Internal Use Only - 6 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 63 STAR_GND DIRTY_GND CLEAN_GND CLEAN_GND Figure 4.4.4 power block of LG-A175 Figure 4.4.4 power block of LG-A175 65/110 65/110 LGE Internal Use Only - 63 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 64 Replace U101 and Re-download software Does it work properly? The phone will Replace the main board Properly operating. 66/110 LGE Internal Use Only - 64 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 65: Charging Trouble

    ISET : Charging current set ISET : 530/R(K) IEOC : End of Charging current set IEOC : R/200 Figure 4.5.2 67/110 LGE Internal Use Only - 65 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 66 TP3 of RT9524 = VBAT? Battery is charged? Replace the main board Charging is properly operating 68/110 LGE Internal Use Only - 66 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 67: Vibrator Trouble

    C337 C338 C339 C340 C341 C342 C343 C345 69/110 15pF 15pF 15pF 15pF 15pF 15pF 15pF 15pF (10V) LGE Internal Use Only - 67 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 68 (+) high? Is the voltage at TP2 Replace the FPCB (+) high? Replace vibrator Vibrator Working well ! 70/110 LGE Internal Use Only - 68 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 69: Lcd Trouble

    4. TROUBLE SHOOTING 4. TROUBLE SHOOTING 4.7 LCD Trouble TEST POINT Figure 4.7.1 71/110 LGE Internal Use Only - 69 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 70 MLED MLED2 RSET C344 EN_SET W_LED_DRV1 R347 R348 C348 4.7K (15K ohm,1/16W,F,1005) Figure 4.7.2 Figure 4.7.2 72/110 72/110 LGE Internal Use Only - 70 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 71 4. TROUBLE SHOOTING Waveform Graph 4.7.1. LCD Backlight Dimming Control Signal Waveform Graph 4.7.2. LCD Data Waveform 73/110 LGE Internal Use Only - 71 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 72 Data pins on TP3 ? Does LCD work Replace LCD module properly ? LCD working well ! 74/110 LGE Internal Use Only - 7 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 73: Speaker Trouble

    4. TROUBLE SHOOTING 4. TROUBLE SHOOTING 4.8 Speaker Trouble TEST POINT Speaker PAD Figure 4.8.1 75/110 LGE Internal Use Only - 73 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 74 AUD_SPK_AMP_EN _SHUTDOWN BYPASS RCV_SPK_OUT_P R308 100Kohms C307 0.22uF L302 R309 RCV_IN_P 4.7ohms C310 390p SPK_P 0ohms R311 76/110 LGE Internal Use Only - 74 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 75 Check the Audio signal Replace the U402 TP4, TP5 Replace The U101 Replace Speaker Speaker Working well!! 77/110 LGE Internal Use Only - 75 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 76: Earphone Trouble

    4. TROUBLE SHOOTING 4. TROUBLE SHOOTING 4.9 Earphone Trouble TEST POINT CN201 Figure 4.9.1 78/110 LGE Internal Use Only - 76 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 77: Headset Path

    MUIC_IO_M MUIC_IO_P MUIC_ACC_ID In case of FM_RADIO, remove GND line C224 0.001uF FM_ANT_1 C238 C239 C225 ZD201 79/110 LGE Internal Use Only - 77 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 78 Change the U203,U101 Earphone will work properly Earphone will work properly 80/110 80/110 LGE Internal Use Only - 78 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 79: Microphone Trouble

    0.033uF C317 39pF C320 R320 MAIN_MIC_N MIC301 100ohms 0.033uF R322 C321 C322 2.2Kohms 39pF 39pF C324 C325 81/110 LGE Internal Use Only - 79 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 80 AC? Check the soldering of Replace U101 TP4, TP5 Resoldering RC component Microphone will work properly. 82/110 LGE Internal Use Only - 80 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 81: Sim Card Interface Trouble

    R203 4.7Kohms J201 SIM_RST_1 SIM_DATA_1 SIM_CLK_1 GND4 GND1 C206 GND3 GND2 C208 C207 C209 22pF 0.1uF 68pF 83/110 LGE Internal Use Only - 81 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 82: Lge Internal Use Only

    Does it work Does it work Properly? Properly? SIM card is properly working SIM card is properly working. 84/110 LGE Internal Use Only - 8 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 83: Key Backlight Trouble

    C334 LD301 LD302 LD303 LD304 LD305 LD306 LD307 LD308 LD309 LD310 R346 Q301 KEY_BACKLIGHT 10Kohms C346 2.2u 85/110 LGE Internal Use Only - 83 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 84 Are all LEDs Check the soldering Working? each R and LED Replace or resolder Backlight will work properly. component 86/110 LGE Internal Use Only - 84 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 85: Fm Radio Trouble

    4. TROUBLE SHOOTING 4. TROUBLE SHOOTING 4.13 FM Radio Trouble TEST POINT Figure 4.13.1 87/110 LGE Internal Use Only - 85 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 86 AUD_SPK_AMP_EN _SHUTDOWN BYPASS RCV_SPK_OUT_P R308 100Kohms C307 0.22uF L302 R309 RCV_IN_P 4.7ohms C310 390p SPK_P 0ohms R311 88/110 LGE Internal Use Only - 86 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 87 A condition is good? Replace U301 A condition is good? FM_radio will work properly FM_radio will work properly 89/110 89/110 LGE Internal Use Only - 87 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 88: Download

    5. DOWNLOAD 5. DOWNLOAD LG-A175 LG-A175 LGE Internal Use Only - 88 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 89 5. DOWNLOAD LG-A175 LG-A175 LG-A175 LGE Internal Use Only - 89 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 90 5. DOWNLOAD LG-A175 LG-A175 LG-A175 LGE Internal Use Only - 90 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 91 5. DOWNLOAD LG-A175 LGE Internal Use Only - 91 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 92 5. DOWNLOAD LGE Internal Use Only - 9 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 93 5. DOWNLOAD LGE Internal Use Only - 93 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 94 5. DOWNLOAD ‘LG-A175’ LGE Internal Use Only - 94 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 95 5. DOWNLOAD LGE Internal Use Only - 95 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 96 5. DOWNLOAD LGE Internal Use Only - 96 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 97 5. DOWNLOAD LG-A175 ‘LG-A175’ LG-A175 LG-A175 LG-A175 LG-A175 LG-A175 ‘LG-A175’ LG-A175 LGE Internal Use Only - 97 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 98 5. DOWNLOAD LG-A175 LG-A175 LG-A175 LG-A175 LG-A175 LG-A175 LGE Internal Use Only - 98 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 99 5. DOWNLOAD LG-A175 LG-A175 LGE Internal Use Only - 99 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 100 5. DOWNLOAD LG-A175 LG-A175 LGE Internal Use Only - 100 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 101: Block Diagram

    LGE Internal Use Only - 101 - - 101 - Copyright © 011 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 102: Circuit Diagram

    UA101 2.5G UART_RX_DATA UART_TX_DATA VCHAR RPWRON ON_SW ON_SW VBAT VBAT URXD UTXD TP102 RPWRON UART_TX_DATA UART_RX_DATA TP104 TP105 LGE Internal Use Only - 102 - Copyright © 2011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 103 (10 uF,6.3V ,M ,X5R ,TC ,2125 ,R/TP) 2.2K C229 C234 C235 ZD201 HS_MIC_P C230 0.1u (2012) 27pF 27pF C231 C232 C236 C237 LGE Internal Use Only - 103 - Copyright © 2011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 104 C345 15pF 15pF 15pF 15pF 15pF 15pF 15pF 15pF C346 R347 R348 C348 2.2u 4.7K (10V) (15K ohm,1/16W,F,1005) LGE Internal Use Only - 104 - Copyright © 2011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 105 CHANGE THIS MODULE TO PART_NO SMRH0005901(SKY77543) 1.2p R410 R413 BAND_DETECT FM Radio R411 DEFAULT_BANDSEL 100K NON FM 100K LGE Internal Use Only - 105 - Copyright © 2011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 106 MEM_A_[16] MLED LCD_RST_N_1.8 MLED1 VBAT MEM_A_[16] MLED2 RCV_SPK_OUT_N RCV_SPK_OUT_P LD101 R103 R104 VIB_P Q101 IND_LED 1.2K R105 100K LGE Internal Use Only - 106 - Copyright © 2011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 107: Bga Pin Map

    8.1 BGA PIN MAP (Top View) 8.1.1 BGA IC pin check (U101) Ball Diagram (Top View), PMB7900(E-GOLDVoice 3) 102/110 LGE Internal Use Only - 107 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 108 8. BGA PIN MAP 8.1.2 BGA IC pin check (U102) Ball Diagram (Top View), 103/110 LGE Internal Use Only - 108 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 109: Pcb Layout

    Main PCB LAYOUT U303(Hall Sensor) - No Slide on off. LD301 ~ LD310 (LED) - No LED ON. LGE Internal Use Only - 109 - Copyright © 2011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 110 - Can’t make a call -Tx Low power - Not good BER - No Service MIC301(C-MIC) - Mute Sending volume LGE Internal Use Only - 110 - Copyright © 2011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 111 LGE Internal Use Only - 111 - - 111 - Copyright © 2011 LG Electronics. Inc. All right reserved. Copyright © 2011 LG Electronics. Inc. All right reserved. Only for training and service purposes Only for training and service purposes...
  • Page 112 LGE Internal Use Only - 112 - - 112 - Copyright © 2011 LG Electronics. Inc. All right reserved. Copyright © 2011 LG Electronics. Inc. All right reserved. Only for training and service purposes Only for training and service purposes...

  • Page 113: Engineering Mode

    LGE Internal Use Only - 113 - - 113 - Copyright © 011 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 114: Auto Calibration

    GSM phone. 11.2 Configuration of Tachyon LG-A175/ LG-A175 LG-A175 LG-A175 LG-A175 LG-A175 105/110 LGE Internal Use Only - 114 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 115: Description Of Basic File

    7. OCX -. OCX_Regist.bat -. TeeChart5.ocx -. UCPRIVATEMQ.OCX -. Vsflex7L.ocx 8. PhoneCmd -. dwdio.dll -. PhoneCommand_045.dll -. QMSL_MSVC9R_Old.dll 106/110 LGE Internal Use Only - 115 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 116: Procedure

    1. Install Tachyon_setup_Kor_20090326.exe or Tachyon_setup_Eng_20090326.exe 2. Copy the files of Tachyon_Release_20101012 to C:\LGE\Tachyon 3. Click on “Tachyon_029.exe” 4. Click on “Login” 107/110 LGE Internal Use Only - 116 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 117 7. Click on “LGA170” => “CLR” => Check D splay “PASS” => “OK” LG-A175 LG-A175 LG-A175 LG-A175 LG-A175 LG-A175 LG-A175 LG-A175 LG-A175 LG-A175 108/110 LGE Internal Use Only - 117 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 118: Agc

    This procedure is for battery calibration. You can get main Battery Config Table and temperature Config Table will be reset. 109/110 LGE Internal Use Only - 118 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 119: Target Power

    PCS 1900 Frequency 1850.2 MHz 1880 MHz 1909.8 MHz Max power 29.5 dBm 29.5 dBm 29.5 dBm 110/110 LGE Internal Use Only - 119 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 120: Exploded View & Replacement Part List

    Cap,Screw GMEY00 Screw,Machine EBR01 PCB Assembly,Main SUMY00 Microphone,Condenser MCBA00 Can,Shield MCK00 Cover,Battery SBPL00 Mobile Phone Battery Li-Ion SUMY00 LGE Internal Use Only - 120 - Copyright © 2011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 121: Replacement Parts

    LCD, Module- EAJ00 EAJ61756101 250CD COLOR 50% 1/1 300:1 60Hz Inverter N - Shanghai Tianma Micro-Electronics Co., Ltd. LGE Internal Use Only - 11 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 122 COMPLEX LGA170.AITAPW ZZ:Without Color MEF031100 Hinge, Folder MEF62262301 COMPLEX, PCX COMPLEX MDS000000 Gasket MDS63610701 COMPLEX LGA170.AITAPW PW:Pearl White - LGE Internal Use Only - 1 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 123 MEV63811001 COMPLEX LGA170.AITAPW BL:Blue - Can Assembly, ABM070300 ABM73436601 LGA170.AGBRBK BK:Black - Shield Dome Assembly, ADB048600 ADB73558201 LGA170.AGBRBK BK:Black - Metal LGE Internal Use Only - 13 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 124 MEZ63828501 COMPLEX LGP520.ACISBK ZZ:Without Color - COMPLEX LGP500.ACISBK ZZ:Without Color MEZ002100 Label, Approval MEZ63927701 Label (Kazakhstan KST Mark) LGE Internal Use Only - 14 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 125: Main Component

    C1005X5R1A105KT000F 1uF 10% 10V X5R - C204, Capacitor, ECZH0001215 55TO+85C 1005 R/TP - TDK KOREA C230, Ceramic, Chip COOPERATION C344, C348 LGE Internal Use Only - 15 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 126 Ceramic, Chip KOREA CORPORATION RC1005F821CS 820OHM 1% 1/16W 1005 R/TP - R204 Resistor, Chip ERHY0000185 SAMSUNG ELECTRO-MECHANICS CO., LTD. LGE Internal Use Only - 16 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 127 MCH155CN102KK 1nF 10% 50V X7R - C237, Capacitor, ECCH0000143 55TO+125C 1005 R/TP - ROHM Semiconductor C409, Ceramic, Chip KOREA CORPORATION C410, C416 LGE Internal Use Only - 17 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 128 Resistor, Chip ERHZ0000404 R404 ROHM. Q201, KTA2014E KTA2014E, , W, R/TP , KEC TR, Bipolar EQBP0006301 Q202 CORPORAITION LGE Internal Use Only - 18 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 129 GRM219R60J226M 0.000022F 20% 6.3V X5R - Capacitor, C133 ECZH0025502 55TO+85C 2012 R/TP 0.85MM MURATA Ceramic, Chip MANUFACTURING CO., LTD. LGE Internal Use Only - 19 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 130 GRM188R71E104K 100nF 10% 25V X7R - Capacitor, C218 ECZH0003504 55TO+125C 1608 R/TP - MURATA Ceramic, Chip MANUFACTURING CO., LTD. LGE Internal Use Only - 130 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 131 1005GC2T1N0SLF 1NH 0.3NH - 300mA 0.12OHM Inductor, C426 ELCH0004703 10GHZ 8 SHIELD NONE 1.0X0.5X0.5MM R/TP Multilayer, Chip PILKOR ELECTRONICS LTD. LGE Internal Use Only - 131 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 132 KTC4075E NPN 5V 60V 50V 150mA 100NA 700 TR, Bipolar EQBN0020501 Q203 100mW ESM R/TP 3P KEC CORPORAITION LGE Internal Use Only - 13 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 133 MCH155A100D 10pF 0.25PF 50V NP0 - Capacitor, C227 ECCH0000110 55TO+125C 1005 R/TP - ROHM Semiconductor Ceramic, Chip KOREA CORPORATION LGE Internal Use Only - 133 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 134 MCH155A220JK 22pF 5% 50V NP0 -55TO+125C Capacitor, C132, ECCH0000115 1005 R/TP - ROHM Semiconductor KOREA Ceramic, Chip C225 CORPORATION LGE Internal Use Only - 134 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 135: 1.3 Accessory

    85HZTO126HZ 1M BLACK 5PIN 5 CRESYN CO., STA-U35RR 150Vac~350Vac 4.8V 400mA 5060 EAY060000 Adapters SSAD0034901 GOST NONE NONE - SUNLIN ELECTRONICS CO., LTD LGE Internal Use Only - 135 - Copyright © 011 LG Electronics. Inc. All right reserved. Only for training and service purposes...

Table of Contents