LG A175 Service Manual Download Page 83

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4. TROUBLE SHOOTING

- 83 -

Only for training and service purposes

LGE Internal Use Only

ʹΠΡΪΣΚΘΙΥ͑ι ͣͨ͑͡͡ͽ͸͑ͶΝΖΔΥΣΠΟΚΔΤ͑͟ͺΟΔ͑͑͟ͲΝΝ͑ΣΚΘΙΥ͑ΣΖΤΖΣΧΖΕ͑͟
΀ΟΝΪ͑ΗΠΣ͑ΥΣΒΚΟΚΟΘ͑ΒΟΕ͑ΤΖΣΧΚΔΖ͑ΡΦΣΡΠΤΖΤ

ͽ͸Ͷ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑΀ΟΝΪ

85/110

4. TROUBLE SHOOTING

4.12 KEY backlight Trouble

TEST POINT

Figure 4.12.1

CIRCUIT

TP1

TP2

TP1

Q301

LD310

LD309

LD308

LD307

LD306

LD305

LD304

LD303

LD302

LD301

C346
2.2u

VBAT

Q301

R337

R333

R328

R329

R330

C333

R331

R332

R336

R335

R346

10Kohms

R334

C334

KEY_BACKLIGHT

KEY BACKLIGHT

TP1

TP2

Summary of Contents for A175

Page 1: ...Internal Use Only Service Manual LG A175 Date March 2011 Issue 1 0 ...

Page 2: ... Front End 44 3 12 KEY BACLKLIGHT LED Interface 50 3 13Vibrator Interface 51 3 14 HALL IC 52 4 TROUBLE SHOOTING 53 4 1 RF Component 53 4 2 RXTrouble 54 4 3TXTrouble 58 4 4 Power OnTrouble 62 4 5 ChargingTrouble 65 4 6VibratorTrouble 67 4 7 LCDTrouble 69 4 8 SpeakerTrouble 73 4 9 EarphoneTrouble 76 4 10 MicrophoneTrouble 79 4 11 SIM Card InterfaceTrouble 81 4 12 KEY backlightTrouble 83 4 13 FM Radi...

Page 3: ...rrier telecommunication service of facilities accessed through or connected to it The manufacturer will not be responsible for any charges that result from such unauthorized use B Incidence of Harm If a telephone company determines that the equipment provided to customer is faulty and possibly causing harm or interruption in service to the telephone network it should disconnect telephone service u...

Page 4: ...look slightly different G Interference and Attenuation Phone may interfere with sensitive laboratory equipment medical equipment etc Interference from unsuppressed engines or electric motors may cause problems H Electrostatic Sensitive Devices ATTENTION Boards which contain Electrostatic Sensitive Device ESD are indicated by the sign Following information is ESD handling Service personnel should g...

Page 5: ...rop Output LDO Liquid Crystal Display LCD Intermediate Frequency IF International Portable User Identity IPUI Global System for Mobile Communications GSM General Purpose Interface Bus GPIB Gaussian Minimum Shift Keying GMSK Flexible Printed Circuit Board FPCB Electrostatic Discharge ESD Electrical Erasable Programmable Read Only Memory EEPROM Digital Signal Processing DSP dB relative to 1 milli wa...

Page 6: ...ed Oscillator VCO Universal Asynchronous Receiver Transmitter UART Time Division Multiple Access TDMA Time Division Duplex TDD Travel Adapter TA Side Tone Masking Rating STMR Pseudo SRAM PSRAM Static Random Access Memory SRAM Sending Loudness Rating SLR Subscriber Identity Module SIM Surface Acoustic Wave SAW Real Time Clock RTC Root Mean Square RMS Receiving Loudness Rating RLR Radio Frequency RF...

Page 7: ... GSM Tx Level 10 Charging time Approx 4 hours RX Sensitivity GSM EGSM 108dBm DCS 108dBm TX output power GSM EGSM 32 5dBm Level 5 DCS PCS 29 5dBm Level 0 SIM card type 3V Small Display MAIN 1 52 TFT 128 Ý 128 pixel 262K Color Status Indicator Hard icons Key Pad 0 9 Up Down Left Right Navigation Key Send Key PWR Key Soft Key Left Right ANT Internal EAR Phone Jack Yes PC Synchronization Not Support S...

Page 8: ...ses LGE Internal Use Only ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 9 110 2 SYSTEM SPECIFICATION Travel Adapter Yes Speaker Receiver 18x12Ȱ Speaker Receiver MIDI 32 poly Item Feature Comment Camera Not Support FM Radio 87 108MHz supported ...

Page 9: ...ror RMS 5 degrees Peak 20 degrees 3 Frequency Error 0 1 ppm 4 Power Level Level Power Toler Level Power Toler 6 31dBm ധ3dB 14 15dBm ധ 3dB 7 29dBm ധ3dB 15 13dBm ധ 3dB 8 27dBm ധ3dB 16 11dBm ധ 5dB 9 25dBm ധ3dB 17 9dBm ധ 5dB 10 23dBm ധ3dB 18 7dBm ധ 5dB 11 21dBm ധ3dB 19 5dBm ധ 5dB 12 19dBm ധ3dB GSM850 EGSM 5 33dBm ധ2dB 13 17dBm ധ 3dB Level Power Toler Level Power Toler 1 28dBm ധ3dB 9 12dBm ധ 4dB 2 26dB...

Page 10: ...ue to modulation Offset from Carrier kHz Max dBc 100 0 5 200 30 250 33 400 60 600 1 200 60 1 200 1 800 60 1 800 3 000 63 3 000 6 000 65 6 000 71 GSM850 EGSM Offset from Carrier kHz Max dBc 100 0 5 200 30 250 33 400 60 600 1 200 60 1 200 1 800 60 1 800 3 000 65 3 000 6 000 65 6 000 73 DCS PCS 6 Output RF Spectrum due to switching transient GSM850 EGSM Offset from Carrier kHz Max dBm 400 19 600 21 1...

Page 11: ...fication 6 Output RF Spectrum due to switching transient Offset from Carrier kHz Max dBm 400 22 600 24 1 200 24 1 800 27 7 Spurious Emissions Conduction Emission Status 8 Bit Error Ratio GSM850 EGSM BER Class II 2 439 102 dBm DCS PCS BER Class II 2 439 100 dBm 9 RX Level Report Accuracy 3 dB 10 SLR 14 4 dB 11 Sending Response 300 12 1 000 6 2 000 6 3 000 6 Frequency Hz Max dB Min dB 100 200 4 000 ...

Page 12: ... 7 500 5 1 000 5 3 000 5 Frequency Hz Max dB Min dB 100 200 4 000 3 400 10 2 0 2 12 0 2 2 14 STMR Over 17 dB Mean that Adopt a straight line in between 300 Hz and 1 000 Hz to be Max level in the range 15 Stability Margin 6 dB 16 System frequency 13 MHz tolerance 2 5 ppm 17 32 768KHz tolerance 30 ppm 18 Ringer Volume At least 65 dBspl under below conditions 1 Ringer set as ringer 2 Test distance se...

Page 13: ...Number Power 4 2 101 2 93 2 20 Antenna Display 2 1 1 0 Battery Bar Number Voltage 3 3 2 3 74 0 05 V 21 Battery Indicator 22 Low Voltage Warning Blinking Bar 1 time per 1 minute Receiver 1 time per 3 minutes Speaker 23 Forced shut down Voltage 3 3 0 05V 24 Battery Type Lithium Ion Battery Standard Voltage 3 7 V Battery full charge voltage 4 2 V Capacity 950mAh 25 Travel Charger Switching mode charg...

Page 14: ...or training and service purposes LGE Internal Use Only 3 TECHNICAL BRIEF ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 15 110 3 TECHNICAL BRIEF 3 1 Digital Main Processor Figure 3 1 1 X Gold tm 110 Hardware Block Diagram ...

Page 15: ...h a 16KB Instruction Cache and a Data cache Buffer FM Stereo Radio Receiver with RDS There are several Interfaces I2S interface for DAI connections for Tape Approval and external Audio component connection High Speed SSC Interface for connection of companion chips like Serial SD Cards High Speed SSC Interface dedicated to Display control USIM Interface with support of Protocol T 1 and Dual USIM su...

Page 16: ...piece driver 32 ȳ headset driver Measurement interfaces PA temperature battery voltage battery temperature and ambient temperature Accessory Detection PCB ID detection as part of measurement interface Differential microphone input System start up circuitry Charger circuitry for NiCd NiMh and LiIon cells with integrated Control Current Voltage Charging Integrated regulators for direct connection to...

Page 17: ... Receiver Sensitivity 2 ɆV EMF Support for US EU bands Stereo recording 3 1 5 Display Type 128 128 QQVGA 262k TFT color parallel Interface Parallel 8 9bit MIPI DBI Type B Interf voltage at 1 8V or 2 8V gRacr Display Controller Hardware 30 fps Display update without DMA up to 60 fps full or partial Video post processing Scaling Rotation 90 steps Mirroring Overlay with alpha blending Color conversio...

Page 18: ...tions These power supplies are generated in the integrated power management Unit PMU The PMU is designed to deliver the power for a typical standard phone Figure 3 2 1 Block Figure of the PMU Modules X Gold tm 110 3 TECHNICAL BRIEF DC DC Step Down Converter for 1 8V SD1 The DC DC converter generates a 1 8 V supply rail This voltage rail is used to supply main parts of the system like the digital c...

Page 19: ...O provides the VCORE supply used for most of the digital parts of the chip LPMU The LPMU provides VPMU sued for the PMU supply e g for the startup state machine and analog parts like ADC sense amplifier etc LAUX The LAUX generates VAUX It is a general purpose LDO and can be used for different functions depending on the phone application e g for the display or Camera LSIM The LSIM LDO generates the...

Page 20: ...All right reserved Only for training and service purposes LGE Internal Use Only ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 21 110 3 TECHNICAL BRIEF Table 3 2 1 Power supply Domains without RF ...

Page 21: ...PMU After starting from reset the small startup state machine enters the SYSTEM OFF state and only continuous the startup procedure if a switch on event like first connect on key wake up or charge detect occurs PMU main State Machine The main PMU state machine is always connected to VPMU also The power up sequence driven by the PMU state machine can be seen in Figure18 After enabling the reference...

Page 22: ...LDO LADC uses either the charger voltage VDD_CHARGE or VDDRTC as input voltage The input voltage is selected automatically by a bulk switch circuit LADC the ADC and the oscillator are enabled on request for every battery measurement if the charger unit is not running This is handled by an ADC control block in one of the state machines If the charger unit is running the ADC is controlled by the cha...

Page 23: ...d Only for training and service purposes LGE Internal Use Only ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 24 110 3 TECHNICAL BRIEF Figure 3 2 2 Second Main Part of the Startup State Machine in the VPMU Domain ...

Page 24: ... read in the PMU registers so it can be used as a functional key during phone operation also 3 2 4 Switching on due to RTC alarm The real time clock can generate a wakeup signal called RTC alarm This signal is sampled from the state machine and after successfully detecting a high the system is switched on 3 2 5 Switching on due to charging When a battery with a voltage below the SSONLEV level is i...

Page 25: ... This state change is indicated to the charger state machine to enable the charger watchdog for safety 3 2 6 Power Supply Start up sequence In order to avoid an excessive drop on the battery voltage caused by in rush current during system power on possibly leading to system instability and hick ups a staggered turn on approach for the regulators is implemented The regulators are turned on in a wel...

Page 26: ...reserved Only for training and service purposes LGE Internal Use Only ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 27 110 3 TECHNICAL BRIEF Figure 3 2 3 Start Up Sequence triggered by First Connect Event ...

Page 27: ... using the vcxo_enable signal This is handled by a dedicated logic in the PMU see Figure 21 As long as rf_sysclk_en_pmu the output of the 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 Figure 3 2 4 How sysclock Enable is Routed in the PMU 3 2 8 Undervoltage Shutdown In active mode the...

Page 28: ...le plugging in a battery a PMU internal oscillator is used for generation of the PMU clock pmu_clock The frequency is slightly above 32 kHz typ 50 kHz to be out of the audio band also for worst case devices After first startup the software shall enable the 32 kHz crystal oscillator It is not possible to use the 32 kHz oscillator during first startup because the settling time of the oscillator can ...

Page 29: ... The DC DC converter works in different modes If the mode is switched from PFM to PWM the pulse width of the DC DC converter depends on the current battery voltage and on the output voltage The PMU state machine knows the battery voltage because of the battery supervision function Depending on this value it selects a startup pulse width for the DC DC converter out of a register table 4 values 3 2 ...

Page 30: ...rs a complete Transmit VCO to Antenna and Antenna to Receive SAW filter solution The FEM also supports Class 12 General Packet Radio Service GPRS multi slot operation The module consists of a GSM900 PA block and a DCS1800 PA block impedance matching circuitry for 50 ȳ input and output impedances Tx harmonics filtering high linearity and low insertion loss PHEMT RF switches diplexer and a Power Amp...

Page 31: ...1 1 1 0 1 6 3 5 3 4 3 17 9 18 8 19 7 20 6 21 5 22 4 23 3 24 2 5 2 6 2 7 2 8 2 9 2 0 3 1 GND1 0 2 D N G 9 1 D N G 8 1 D N G 7 1 D N G 6 1 D N G 5 1 D N G GND2 GND14 DCS_TX ANT GND3 GND10 GSM_TX GND9 GND4 GND8 VBATT GND7 GND5 RSVD2 VLOGIC GSM_RX 4 D N G P 5 D N G P 6 D N G P P M A R V N E _ X T S B D V S R 6 D N G X R _ S C D 1 D V S R 7 D N G P 8 D N G P 9 D N G P PGND10 PGND11 PGND12 PGND13 PGND14...

Page 32: ... The X GOLDTM110 RF Subsystem contains a fully integrated 26 MHz digitally controlled crystal oscillator designed for 8 pF crystals The only external part of the oscillator is the crystal itself Overall pulling range of the DCXO is approximately 55 ppm controllable by a 13 bit tuning word DCXO_AFC 16 4 The 26 MHz reference clock can also be applied to external components like Bluetooth or GPS via ...

Page 33: ...EGSM900 and one high band DCS1800 or PCS1900 A block diagram of the RF subsystem is given in Figure 3 4 1 3 TECHNICAL BRIEF 3 5 2 FUNCTIONAL DESCRIPTION Figure 3 5 2 RECEIVER CHAIN BLOCK DIAGRAM 3 5 2 1 Receiver The X GOLDTM110 receiver is based on the Direct Conversion Receiver architecture DCR and can be configured to support one low band GSM850 or EGSM900 and one high band DCS1800 or PCS1900 A ...

Page 34: ...tional N sigma delta synthesizer for constant envelope GMSK modulation This configuration allows a very low power design without any external components Up and down ramping is performed via the ramping DAC connected to VRAMP 3 5 2 3 RF synthesizer The X GOLDTM110 transceiver contains a fractional N sigma delta synthesizer for frequency synthesis in RX mode In TX mode the fractional N sigma delta s...

Page 35: ... 2 4 Front end PA Control Interface Two outputs FE1 FE2 for direct control of antenna switch modules enable to select RX and TX mode as well as low and high band operation An extra band select signal PABS for the power amplifier is used to support discrete PA and switching modules Time accurate power dissipation of the PA is achieved by the control signal PAEN A minor set of power amplifiers requi...

Page 36: ...ly these four devices are referred to in this document as the M36W0Rx040x6 The purpose of this document is to describe how the two memory components operate with respect to each other It must be read in conjunction with the M58WR0xxKUL and M69KM024A datasheets which detail all the specifications required to operate the flash memory and PSRAM components These datasheets are available from your loca...

Page 37: ...memory components share the same power supplies and the same grounds They are distinguished by two Chip Enable inputs EF for the flash memory and EP for the PSRAM Recommended operating conditions do not allow more than one device to be active at a time such as simultaneous read operations on the flash memory and the PSRAM component which would result in a data bus contention Therefore it is recomm...

Page 38: ...Signal Description SIM_RST 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 The Main Base Band Processor XMM 110 provides SIM Interface Module The XMM2130 checks status Periodically During established call mode whether SIM card is inserted or not but it doesn t check during deep sleep mode In order to communicate...

Page 39: ...ndent of still picture area ILI9163C can operate with 1 65V I O interface voltage and an incorporated voltage follower circuit to generate voltage levels for driving an LCD The ILI9163C also supports a function to display in 8 colors and a sleep mode allowing for precise power control by software and these features make the ILI9163C an ideal LCD driver for medium or small size portable products su...

Page 40: ...s mode has very low resistance allowing LED current regulation to be maintained with input supply voltage approaching the LED forward voltage The AAT3192 is available in the 2x2mm 10 lead SC70JW 10 package Drives up to 2 LEDs at up to 30mA each Automatic Switching Between 1x and 2x Modes 0 9MHz Switching Frequency Linear LED Output Current Control Single wire S2Cwire Interface AAT3192 1 16 step 10...

Page 41: ...9524 the maximum charging current can be programmed with an external resister For the USB application user can set the current to 100mA 500mA through EN SET pin For the production testing mode RT9524 can allow 4 2V 2 3A power pass through to support system operation It also provide a 50mA LDO to support the power of peripheral circuit The internal thermal feedback circuitry regulates the die tempe...

Page 42: ...ΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 43 110 3 10 Keypad Interface Figure 3 10 1 MAIN KEY STRUCTURE 3 TECHNICAL BRIEF 27p C328 27p C319 27p C314 VRTC KEY_IN3 KEY_IN2 KEY_IN1 KEY_OUT4 KEY_OUT3 KEY_OUT2 KEY_IN0 KEY_OUT1 END_KEY KEY_IN4 2 UP 1 KEY MATRIX 9 4 7 0 SEL LEFT 6 OK 3 RIGHT END SEND 8 5 MENU DOWN NOT SMT NOT SMT ...

Page 43: ...ed to ground the number of keys can be extended by up to 8 keys This results in a maximum number of 72 keys to by identified by the Keypad Interface Controller The Keypad Scan Module reduces the number of interrupts and polling through the processor and therefore reduces the power consumption The module is able to debounce and scan the external keypad matrix automatically without any software inte...

Page 44: ...ne perspective called audio in and audio out subsequently It features a high quality stereo digital to analog path with amplifier stages for connecting acoustic transducers to X GOLD 110 In audio in path the supply voltage generation for electret microphones a low noise amplifier and analog to digital conversion are integrated in X GOLD 110 A more detailed functional description will be given in t...

Page 45: ...analog part is enabled These major modes can be modified by certain control register settings Due to the new gain settings in the TX path the maximum input voltage is limited to 0 8 Vpp In both voiceband paths the value range for voice samples is confined to 97 5 i e to 31948 31947 or 8334H 7CCBH in X GOLDTM110 On the TX path 83 1 s on the VTPDM line correspond to a 16 bit value of 7CCBH and 17 1 ...

Page 46: ...s followed by the gain control amplifier section The DAC outputs can be switched to several output buffers In audio in section there is an input multiplexer which selects either one of two differential microphone inputs to be connected to the low noise amplifier and analog pre filter The signals from the analog pre filter are input to a second order sigma delta analog to digital converter In addit...

Page 47: ...vers can be used to drive a 16 ȳ headset They can work unipolar mode where an AC coupling of the headset might be needed or can work also in bipolor mode The differential loudspeaker driver can be used to drive a 8 ȳ loudspeaker As it is a class D amplifier the needed suppression of the higher harmonics of the switching signals has to be achieved by the external circuitry The buffers are designed ...

Page 48: ...o in path consists of an input selector a low noise amplifier and following pre filter with gain control a second order ȭȟ converter and a digital decimation filter It supports both standard GSM bandwidth 3 5 kHz and wideband bandwidth 7 kHz speech bands The differential input signal from the microphone first passes a low noise amplifier and following pre filter and an anti aliasing pre filtering ...

Page 49: ...F 2 microphone supplies VMIC and VUMIC are available The supply VUMIC has a ultra low power mode where the current consumption is minimum whilst at the same time the noise performance is reduced For this purpose the VUMIC is directly supplied out of the VMIC regulator the Mic Buffer can be switched off and only the quiescent current of the VMIC regulator is present This mode can be used to supply ...

Page 50: ...s controlled by switch Q301 If KEY_BCKLIGHT is high Current is flowing from VBAT to LED Then Light emitted from The LED Figure 3 12 1 Key Backlight Block 3 TECHNICAL BRIEF LD310 LD309 LD308 LD307 LD306 LD305 LD304 LD303 LD302 LD301 C346 2 2u VBAT Q301 1 2 3 s m h o 0 6 5 R337 s m h o 0 6 5 R333 s m h o 0 6 5 R328 s m h o 0 6 5 R329 s m h o 0 6 5 R330 1u C333 s m h o 0 6 5 R331 R332 s m h o 0 6 5 s...

Page 51: ...110 without any external component required It is capable to driver the vibrator motor up to 150mA Figure 3 13 1 Vibrator Driver Block Diagram 3 TECHNICAL BRIEF Figure 3 13 2 Vibrator Driver Block 15pF C338 C 1 15pF C337 C336 15pF VAUX VBAT C335 1u C345 1u VIO_1V8 R350 0ohms 2 0 3 A V F p 9 3 9 0 3 C 8 0 3 C F p 9 3 1 0 3 A V CN302 21 20 22 19 23 18 24 17 25 16 26 15 27 14 28 13 29 12 30 11 31 10 ...

Page 52: ...Θ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 53 110 3 14 HALL IC Hall sensor respond to the magnetic field If it is used for mobile phones It is used for opening of the slide A little magnet attached to the slide If slide is opened Hall sensor is ON Therefore to see whether the opening of the slide 3 TECHNICAL BRIEF Figure 3 14 1 Hall Sensor block 3 2 4 1 VDD OUT VSS NC VIO_1V8 VIO_1V8 HALL_SENS_DE...

Page 53: ...urposes LGE Internal Use Only ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 55 110 4 1 RF Component 4 TROUBLE SHOOTING Figure 4 1 U101 Main Chip EGV3 U401 Tx Module FL401 SAW Filter X101 Crystal 26MHz Clock U101 U401 FL401 X101 4 TROUBLE SHOOTING ...

Page 54: ...Δ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 56 110 START Re download SW or Do calibration again HP8960 Test mode 62 CH 7 level setting TCH 62CH 60dBm setting BCCH Spectrum analyzer setting Oscilloscope setting Check 1 Crystal Circuit Check 2 Mobile SW TX module 4 2 RX Trouble CHECKING FLOW 4 TROUBLE SHOOTING Check 3 PLL Control ...

Page 55: ...ΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 57 110 1 Checking Crystal Circuit 4 TROUBLE SHOOTING TEST POINT CIRCUIT WAVEFORM CHECKING FLOW Figure 4 2 1 26 MHzO K No Crystal is OK See next page to check PLL Circuit Yes Replace X101 Figure 4 2 2 Figure 4 2 3 TP0 26MHz TP0 X101DSX321G 26M 26MHz 2 1 3 4 A3 A4 F2 F1 A8 A9 FMRIN FMRINX XO XOX RX12 RX12X FM_ANT RF_GSM_RXP RF_GSM_RXN TP0 ...

Page 56: ...N G 9 1 D N G 8 1 D N G 7 1 D N G 6 1 D N G 5 1 D N G GND2 GND14 DCS_TX ANT GND3 GND10 GSM_TX GND9 GND4 GND8 VBATT GND7 GND5 RSVD2 VLOGIC GSM_RX 4 D N G P 5 D N G P 6 D N G P P M A R V N E _ X T S B D V S R 6 D N G X R _ S C D 1 D V S R 7 D N G P 8 D N G P 9 D N G P PGND10 PGND11 PGND12 PGND13 PGND14 PGND15 6 1 D N G P 7 1 D N G P 8 1 D N G P 9 1 D N G P 0 2 D N G P PGND1 PGND2 PGND3 942 5 MHz 35 ...

Page 57: ...Σ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 59 110 CHECKING FLOW 4 TROUBLE SHOOTING Check TP3 TP7 of U101 Mobile SW FEM is OK Yes TP2 signal same as TP1 Replace SW401 Yes Replace PMB8810 U101 TP4 H Band TP3 L Band Signal is OK No Yes Check PMB8810 Control Signal TP5 6 7 is VLogic TX EN BS OK No Yes Yes TP2 Signal is OK Replace U401 EGSM RX No No TP8 9 Signal is OK Replace FL401 No ...

Page 58: ...Τ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 60 110 4 3 TX Trouble START Redownload SW or Do calibration again HP8960 Test mode 62 CH 7 level setting TCH 62CH 60dBm setting BCCH Spectrum analyzer setting Oscilloscope setting 1 Check Crystal Circuit CHECKING FLOW 4 TROUBLE SHOOTING 2 Check Mobile SW FEM 3 Check PLL Control ...

Page 59: ... No Crystal is OK See next page to check PLL Circuit Yes Replace X101 Figure 4 3 2 Figure 4 3 3 TP1 26MHz 1 pin X101DSX321G 26M 26MHz 2 1 3 4 A3 A4 F2 F1 A8 A9 FMRIN FMRINX XO XOX RX12 RX12X FM_ANT RF_GSM_RXP RF_GSM_RXN 1 pin ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 61 110 1 Checking Crystal Circuit 4 TROUBLE SHOOTING TEST POINT CI...

Page 60: ...F_GSM_OUT RF_TX_EN RF_V_RAMP ANT_FEED CHANGE THIS DUAL SAW FILTER 10 uF 10V Z Y5V HD 2012 R TP TO PART_NO SMRH0005901 SKY77543 IN CASE OF GSM850 PCS1900 CHANGE THIS MODULE IN CASE OF GSM850 PCS1900 TO PART_NO SFSB0001301 B9506 Change to 850 SMT ECZH0000806 ELCH0003834 ECZH0000806 5pF 5pF 4 3nH L402 C404 C403 100 R405 R402 100 SW401 G2 ANT RF G1 DNI C420 100 R403 VBAT 2 2nH 2 2nH 1 5n 1 2p C421 DNI...

Page 61: ...ΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 63 110 CHECKING FLOW 4 TROUBLE SHOOTING Check TP2 of SW401 TP2 Signal is OK Replace Mobile SW SW401 Yes No Yes Mobile SW TX Module and Saw Filter is OK Check Main Chip U101 Control Signal TP3 4 5 is VLogic BS OK No Yes Check TP3 TP6 of U401 Replace FL401 or U401 TP7 High Band TP6 Low Band Signal is OK No Yes EGSM TX ...

Page 62: ...ternal Use Only ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 64 110 4 4 Power On Trouble 4 TROUBLE SHOOTING TP1 TP4 TP8 TP2 TP3 Figure 4 4 1 Figure 4 4 3 Remote power on TP6 Figure 4 4 2 U101 U102 X101 TP9 TP9 TP5 TP7 R104 10K 100Kohms R105 END_KEY RPWRON TP9 ...

Page 63: ...F F E R V D N G A B I V B I V _ S S V 1 8 V 1 D D V U M P _ T A B V U M P _ S S V 1 F R V O X D D V O X S S V C D T D D V G I D S S V F R S S V O L S S V X R T D D V O C D S S V T A B V 2 F R D D V X R T S S V S M D D V P S T A B V R S L S S V 1 P C 2 P C G E N D D V S M _ 8 V 1 _ D D V S M S S V R M F _ D D V C T R V M I S V U M P V X U A V E R O C V 1 E R O C D D V 2 E R O C D D V 1 E R O C S S ...

Page 64: ...r on key And check the level change into high of POWERKEY Check the voltage of The LDO outputs at U101 Logic level at RPWRON of TP9 HIGH above 1 2V Is the phone power on The phone will Properly operating Charge or Change Battery Check the contact of power key Or dome switch Replace U101 TP1 1 2V TP2 1 8V TP3 1 3V TP4 1 4V TP5 2 5V TP6 2 8V TP7 1 2V TP8 2 8V Re download software Does it work proper...

Page 65: ...Ϊ 67 110 4 5 Charging Trouble TEST POINT CIRCUIT Figure 4 5 1 4 TROUBLE SHOOTING Figure 4 5 2 TP2 TP1 TP1 TP2 TP3 TP3 u 1 1 0 2 C 3 0 2 C u 1 2 0 2 R K 0 0 1 VBAT VUSB_BUS 1 0 2 R K 0 0 1 I N D 4 0 2 C u 1 VCHG_IO 0 2 8 4 0 2 R 6 5 7 4 8 3 9 2 10 1 11 PGND VIN BATT ISET PGB GND1 CHGSB LDO GND2 IEOC EN_SET VCHG_IN CHG_EOC_N VAUX VCHG_IO CHG_EN_N_1 IEOC End of Charging current set IEOC R 200 ISET 53...

Page 66: ... START Check the voltage at TP1 of RT9524 4 8V Is the voltage at TP3 of RT9524 VBAT YES YES Battery is charged YES Charging is properly operating NO NO The TA is out of order Change the TA Resolder the CN201 TP1 VCHG_IN Replace the U201 Replace the main board CHECKING FLOW 4 TROUBLE SHOOTING Battery is charged NO Change the battery Charging is properly operating YES NO Check the voltage at TP2 of ...

Page 67: ...341 15pF 15pF C340 15pF C342 15pF C338 C339 15pF 15pF C337 100ohms R340 R339 100ohms C336 15pF R338 100ohms VAUX VBAT C335 1u C345 1u VIO_1V8 R350 0ohms 2 0 3 A V F p 9 3 9 0 3 C 8 0 3 C F p 9 3 1 0 3 A V CN302 21 20 22 19 23 18 24 17 25 16 26 15 27 14 28 13 29 12 30 11 31 10 32 9 33 8 34 7 35 6 36 5 37 4 38 3 39 2 40 1 1u C349 0ohms R349 1u VA316 LCD_CS_N LCD_MAKER_ID MEM_ MEM_ MEM_ MEM_ MEM_ MEM...

Page 68: ...ΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 70 110 4 TROUBLE SHOOTING START YES NO YES Replace vibrator YES Vibrator Working well Replace the U101 NO CHECKING FLOW SETTING Enter the engineering mode and set vibrator on at vibration of BB test menu Is the voltage at TP2 high Is the voltage at TP1 high Replace the FPCB ...

Page 69: ...ght reserved Only for training and service purposes LGE Internal Use Only ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 71 110 4 TROUBLE SHOOTING 4 7 LCD Trouble TEST POINT Figure 4 7 1 TP1 TP2 TP3 TP4 ...

Page 70: ...pF 15pF C340 15pF C342 15pF C338 C339 15pF 15pF C337 100ohms R340 R339 100ohms C336 15pF R338 100ohms VAUX VBAT C335 1u C345 1u VIO_1V8 R350 0ohms 2 0 3 A V F p 9 3 9 0 3 C 8 0 3 C F p 9 3 1 0 3 A V CN302 21 20 22 19 23 18 24 17 25 16 26 15 27 14 28 13 29 12 30 11 31 10 32 9 33 8 34 7 35 6 36 5 37 4 38 3 39 2 40 1 1u C349 0ohms R349 1u VA316 LCD_CS_N LCD_MAKER_ID MEM_AD_ 00 MEM_AD_ 01 MEM_AD_ 02 M...

Page 71: ...r training and service purposes LGE Internal Use Only ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 73 110 4 TROUBLE SHOOTING Waveform Graph 4 7 1 LCD Backlight Dimming Control Signal Waveform Graph 4 7 2 LCD Data Waveform ...

Page 72: ...BLE SHOOTING START Is the connection of TP1 with LCD connector ok NO Reassemble LCD Module NO Check the Voltage Level of TP3 and TP4 is about Battery voltage W_LED_DRV signal is 1 Pulse about 75us YES Resoldering or Replace U304 NO Does LCD work properly Replace LCD module LCD working well YES CHECKING FLOW YES NO YES Check the Waveform of Data pins on TP3 Replace U101 Is the connection of TP2 wit...

Page 73: ...rved Only for training and service purposes LGE Internal Use Only ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 75 110 4 8 Speaker Trouble TEST POINT Figure 4 8 1 4 TROUBLE SHOOTING TP2 TP3 Speaker PAD TP5 TP4 ...

Page 74: ... S H N _ C I M _ S H N _ K P S P _ K P S N _ C I M _ N I A M P _ C I M _ N I A M L _ S H R _ S H P _ V C R N _ V C R VBAT 0 1uF C303 6 5 7 4 8 3 9 2 10 1 C C V 2B1 1 B 1 2A 1A S2 S1 0 B 2 1B0 D N G RCV_PATH_SEL RCV_PATH_SEL RCV_P RCV_N RCV_IN_P RCV_IN_N RCV_SPK_N RCV_SPK_P r301 0ohms U301 B2 C1 A1 B1 B3 C2 A3 C3 IN VDD IN VO _SHUTDOWN VO BYPASS GND 1n 1n L302 390p C310 10K R304 C302 2 2uF 4 7ohms ...

Page 75: ...ΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 77 110 START Check the Soldering of Speaker PAD Speaker Working well Check the TP2 TP3 Audio control signal is OK No Yes Replace the U101 Replace Change speaker No CHECKING FLOW Check the Audio signal TP4 TP5 No Resoldering R303 R309 L301 L302 Replace the U402 Replace The U101 Yes 4 TROUBLE SHOOTING Yes Check the ZiF B to B Con Assemble Reassemble LCD or FPCB No Yes Re...

Page 76: ...nly for training and service purposes LGE Internal Use Only ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 78 110 4 9 Earphone Trouble TEST POINT Figure 4 9 1 4 TROUBLE SHOOTING TP1 TP2 TP3 TP4 TP5 TP7 TP6 U20 3 CN201 ...

Page 77: ...HS_R HS_OUT_R Headset Path C230 1u 2 17 5 14 1 13 10 11 6 3 9 8 12 4 16 15 7 COMP2 SDA CAP GND RES UID U2 AUD1 COMN1 MIC U1 INT BAT SCL VB NC AUD2 VUSB_BUS C236 1n C237 1n VIO_1V8 VAUX 100Kohms R219 R218 10K R226 10K R225 10K R217 10 C216 0 1uF C229 27pF R223 2 2K C226 0 022uF C223 10u C222 10u C219 0 022uF 2 2K R221 VBAT 27pF C231 C217 27pF C232 27pF C221 39pF C220 2 2uF 0 1u C218 MUIC_INT_N MUIC...

Page 78: ...our voice from the earphone NO Resolder TP2 TP3 U203 TP4 TP5 Call or ResolderTP6 TP7 or Change the U203 U101 4 TROUBLE SHOOTING Check the TP1 pin 4 of CN201 is LOW U101 ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 80 110 START Is TP2 TP3 Signal check NO YES Resolder CN201 YES Earphone will work properly Can you hear your voice from the...

Page 79: ...ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 81 110 4 10 Microphone Trouble TEST POINT CIRCUIT Figure 4 10 1 4 TROUBLE SHOOTING TP1 TP2 TP4 TP5 TP3 TP1 TP2 TP4 TP5 TP3 0 033uF C315 39pF C321 R322 2 2Kohms R318 100ohms 100ohms R320 VMIC R314 1Kohms R317 2 2Kohms C313 39pF C322 39pF MIC301 2 1 C320 0 033uF 39pF C317 C324 DNI DNI C325 10u C312 MAIN_MIC_N MAIN_MIC_P ECCH0005604 10 uF 6 3V M X5R TC 1608 R TP MIC TP1 ...

Page 80: ...ES Microphone will work properly SETTING After initialize Agilent 8960 Test EGSM900 DCS mode or GSM850 PCS mode YES Check the signal Level at each side of TP2 TP3 Is it a few tens mV AC Check the soldering of TP4 TP5 Make a phone call then check TP1 mic bias signal comes from U101 NO Change the microphone YES NO Replace U101 CHECKING FLOW 1 Check mic Bias signal line 2 Change the U101 Check microp...

Page 81: ...ΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 83 110 4 11 SIM Card Interface Trouble TEST POINT CIRCUIT Figure 4 11 1 4 TROUBLE SHOOTING J201 TP1 TP3 TP1 TP2 TP3 TP2 J201 9 8 10 7 6 3 5 2 4 1 C1 C5 C2 C6 C3 C7 GND1 GND4 GND2 GND3 22pF C206 C209 68pF VSIM_1 4 7Kohms R203 VSIM_1 C207 0 1uF DNI C208 VSIM_1 SIM_RST_1 SIM_DATA_1 SIM_CLK_1 SIM_CONNECTOR TP3 TP1 TP2 ...

Page 82: ...10 START Does the SIM card support 3V or 1 8V NO Change the SIM Card This phone supports 3V or 1 8V SIM card YES Is Voltage at the TP1 2 85V or 1 8V NO Change the U100 NO YES Resoldering J201 YES Voltage output of VSIM LDO Is 2 85V Change the SIM Card And try again Does it work Properly YES SIM card is properly working redownload SW Does it work Properly NO Change the main board NO YES SIM card is...

Page 83: ...5 110 4 TROUBLE SHOOTING 4 12 KEY backlight Trouble TEST POINT Figure 4 12 1 CIRCUIT TP1 TP2 TP2 TP1 Q301 LD310 LD309 LD308 LD307 LD306 LD305 LD304 LD303 LD302 LD301 C346 2 2u VBAT Q301 1 2 3 s m h o 0 6 5 R337 s m h o 0 6 5 R333 s m h o 0 6 5 R328 s m h o 0 6 5 R329 s m h o 0 6 5 R330 1u C333 s m h o 0 6 5 R331 R332 s m h o 0 6 5 s m h o 0 6 5 R336 R335 s m h o 0 6 5 R346 10Kohms s m h o 0 6 5 R3...

Page 84: ...ΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 86 110 4 TROUBLE SHOOTING START Is TP1of Q301 low TP2 KEY_BACKLIGHT high NO Replace Q301 Replace U101 Are all LEDs Working NO YES Check the soldering each R and LED Backlight will work properly NO Replace or resolder component CHECKING FLOW YES ...

Page 85: ...ved Only for training and service purposes LGE Internal Use Only ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 87 110 4 TROUBLE SHOOTING 4 13 FM Radio Trouble TEST POINT TP1 TP2 TP3 TP4 TP5 TP7 TP6 Figure 4 13 1 ...

Page 86: ... MUIC_IO_P In case of FM_RADIO remove GND line m m 2 h t d i W e n i L VBAT 0 1uF C303 6 5 7 4 8 3 9 2 10 1 C C V 2B1 1 B 1 2A 1A S2 S1 0 B 2 1B0 D N G RCV_PATH_SEL RCV_PATH_SEL RCV_P RCV_N RCV_IN_P RCV_IN_N RCV_SPK_N RCV_SPK_P r301 0ohms U301 B2 C1 A1 B1 B3 C2 A3 C3 IN VDD IN VO _SHUTDOWN VO BYPASS GND 1n 1n L302 390p C310 10K R304 C302 2 2uF 4 7ohms R303 R309 4 7ohms 10K R305 30K R302 33n C304 0...

Page 87: ... condition of CN201 YES A condition is good YES NO Replace CN201 NO Replace U402 A condition is good Check TP4 TP5 Check TP6 TP7 YES NO Replace U301 A condition is good ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 89 110 4 TROUBLE SHOOTING A condition is good START Check of ear_jack condition NO YES CHECKING FLOW FM_radio will work pro...

Page 88: ...pyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 5 DOWNLOAD k G GaG㜼 Onzt s pG GZUWP XUj G G GGaG㜼 iyh psGO tnP YUGzV G 㾡 aG㜼 OGw 㾡ㇵḴ㛺㢀UGP LG A175 LG A175 ...

Page 89: ...5 DOWNLOAD 89 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only kss 㾡 a 㜼 On Y_W kssP kssG 㾡 aG㜼 On Y_W UkssP LG A175 LG A175 LG A175 ...

Page 97: ...5 DOWNLOAD 97 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only LG A175 LG A175 LG A175 LG A175 LG A175 LG A175 LG A175 LG A175 LG A175 ...

Page 101: ...poses LGE Internal Use Only 6 Block diagram 6 Block Diagram 101 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 94 110 6 Block Diagram ...

Page 102: ...100Kohms R105 1UF C103 VAUX VRTC UA101 12 11 10 9 8 7 6 5 4 3 2 1 GND RX TX NC1 ON_SW VBAT NC2 NC3 NC4 DSR RTS CTS GND RX TX VCHAR ON_SW VBAT PWR URXD UTXD 3G 2 5G VDDMS VDDTRX 8 V 1 _ O I V 32 768KHz MC 146_12_5PF X102 2 1 3 4 VIO_1V8 F u 7 4 0 0 5 1 1 C F u 1 0 4 0 1 C VMEM_PWR 6 1 1 C F u 7 4 0 0 2 1 C F u 1 0 VDDTDC VDDXO VBAT C3 D3 C12 C11 F11 C8 C4 C7 D6 F7 F6 F5 H7 H4 H3 G12 G11 G10 F4 F3 E...

Page 103: ...223 2 2K C226 0 022uF C223 10u VSIM_2 C222 10u C219 0 022uF 2 2K R221 VBAT 27pF C231 C217 27pF 1u C225 C232 27pF C221 39pF 0 001uF C224 C220 2 2uF VCHG_IN 0 1u C218 CN202 3 2 1 21 13 6 19 12 11 5 18 8 1 2 17 16 3 4 9 10 14 20 7 15 SPIDATA SIO1 SCLK2 SPICK SIMCLK SIMRST VSIM1 T A B V NC2 VREF O I V VSIM2 SIMIO SIO2 SCLK1 NC1 SYSRSTB SRST2 SRST1 SPICS GND F U 1 0 1 2 C DNI C212 2 1 8 V 1 _ O I V T A...

Page 104: ...uF C307 C313 39pF VBAT F p 9 3 9 0 3 C C322 39pF 0 1uF C303 MIC301 2 1 C320 0 033uF 6 5 7 4 8 3 9 2 10 1 C C V 2B1 1 B 1 2A 1A S2 S1 0 B 2 1B0 D N G 39pF C317 8 0 3 C F p 9 3 C324 DNI DNI C325 1 0 3 A V R308 100Kohms 10u C312 C306 39pF 33n C305 CN302 21 20 22 19 23 18 24 17 25 16 26 15 27 14 28 13 29 12 30 11 31 10 32 9 33 8 34 7 35 6 36 5 37 4 38 3 39 2 40 1 27p C328 390p C301 27p C319 27p C314 V...

Page 105: ...E _ X T S B D V S R 6 D N G X R _ S C D 1 D V S R 7 D N G P 8 D N G P 9 D N G P PGND10 PGND11 PGND12 PGND13 PGND14 PGND15 6 1 D N G P 7 1 D N G P 8 1 D N G P 9 1 D N G P 0 2 D N G P PGND1 PGND2 PGND3 R410 DNI 942 5 MHz 35 MHz 10 5 3 2 6 4 7 8 9 1 I1 O1_1 O1_2 O2_1 I2 O2_2 1 G 2 G 3 G 4 G 1n C416 1K R404 C410 1n C412 33n 24K R407 1u C415 VA401 C413 10n C405 DNI ANT402 ANT401 DNI R413 FM_ANT RF_VLOG...

Page 106: ...N LCD_CS_N IND_LED IND_LED MEM_WR_N MEM_WR_N MEM_A_ 16 MEM_A_ 16 MEM_AD_ 07 MEM_AD_ 07 MEM_AD_ 06 MEM_AD_ 06 MEM_AD_ 05 MEM_AD_ 05 MEM_AD_ 04 MEM_AD_ 04 MEM_AD_ 03 MEM_AD_ 03 MEM_AD_ 02 MEM_AD_ 02 MEM_AD_ 01 MEM_AD_ 01 MEM_AD_ 00 MEM_AD_ 00 MLED MLED MLED1 MLED1 MLED2 MLED2 LCD_RST_N_1 8 LCD_RST_N_1 8 VIB_P VIB_P RCV_SPK_OUT_N RCV_SPK_OUT_N LCD_MAKER_ID LCD_MAKER_ID RCV_SPK_OUT_P RCV_SPK_OUT_P FPC...

Page 107: ... training and service purposes LGE Internal Use Only ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 102 110 8 1 BGA PIN MAP Top View 8 1 1 BGA IC pin check U101 ؼ Ball Diagram Top View PMB7900 E GOLDVoice 3 8 BGA PIN MAP ...

Page 108: ...nc All right reserved Only for training and service purposes LGE Internal Use Only ʹΠΡΪΣΚΘΙΥ ι ͽ ͶΝΖΔΥΣΠΟΚΔΤ ͺΟΔ ͲΝΝ ΣΚΘΙΥ ΣΖΤΖΣΧΖΕ ΟΝΪ ΗΠΣ ΥΣΒΚΟΚΟΘ ΒΟΕ ΤΖΣΧΚΔΖ ΡΦΣΡΠΤΖΤ ͽ Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΟΝΪ 103 110 8 1 2 BGA IC pin check U102 ؼ Ball Diagram Top View ...

Page 109: ... VA307 VA310 VA313 6 0 3 D L VA311 C346 1 0 3 Q VA301 VA302 R333 L303 VA316 C349 C207 9 0 2 C 5 4 3 C 3 0 2 R C206 R338 8 0 2 C 3 2 3 R R332 R328 LD303 VA315 9 2 3 C C340 C337 9 3 3 R R341 R342 R340 C338 C336 C339 1 1 3 C 1 0 3 D L 8 2 3 C KB305 2 0 3 D L 9 2 3 R R330 6 2 3 C 7 2 3 R LD304 1 2 3 R 4 2 3 R 9 1 3 R 6 2 3 R KB302 R345 C316 R344 R315 C342 8 1 3 C 3 0 3 U C343 7 0 3 B K 2 1 3 B K 9 PCB...

Page 110: ...R C218 FB204 FB205 101R 213C R234 U202 843R C240 743R C242 C210 C241 R413 R410 201PT 904R ZD201 Q401 C424 C224 C239 C127 R228 C238 821C 921C 313C R314 C324 523C 023R 813R 713R U304 R205 R227 FB202 FB201 C236 C216 C237 R230 702R 802R C344 743C 843C U201 R202 C204 R201 C202 C203 C201 L201 C223 R217 C222 C225 302U C232 712C C220 122C C226 R221 132C C219 R219 C317 123C 803AV 223C 903AV C335 C205 CN201...

Page 111: ... Q101 1 B V 1 0 1 D L VA101 VA102 R101 R103 CN101 R104 5 0 1 R 111 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 9 PCB LAYOUT 111 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 9 PCB LAYOUT ...

Page 112: ...11 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 9 PCB LAYOUT 112 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 113: ... service purposes LGE Internal Use Only Engineering mode is designed to allow a service man engineer to view and test the basic functions provided by a handset The key sequence for switching the engineering mode on is 1809 175 Select Pressing END will switch back to non engineering mode operation Use Up and Down key to select a menu and press select key to progress the test Pressing back key will ...

Page 114: ... side Calibration tool that perform Tx Rx and Battery Calibration with Agilent 8960 GSM call setting instrument and Tektronix PS2521G Programmable Power supply Auto cal generates calibration data by communicating with phone and measuring equipment then write it into calibration data block of flash memory in GSM phone 10 AUTO CALIBRATION 11 2 Configuration of Tachyon LG A175 LG A175 LG A175 LG A175...

Page 115: ...nfo msl rfl 3 Instrument Instrument_037 dll 4 Lang ResEng_015 dll ResKor_015 dll 5 Log log 6 Model LGA170A CLR LGA170A_Calibration_002 xml dwdio_001 dll LGA170A_CallSetup_001 xml LGA170A_CalLogic_002 dll LGA170A_Sequence_002 xml xmm1100_eep022 cfg LGA170A CLR LGA170B_Calibration_003 xml dwdio_001 dll LGA170B_CallSetup_001 xml LGA170B_CalLogic_002 dll LGA170B_Sequence_003 xml xmm1100_eep022 cfg 7 O...

Page 116: ...up_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 10 AUTO CALIBRATION 11 4 Procedure 9 Utilities Stiletto XEditorfile AuthorityChange_008 exe Hecaton exe MakeNVFile exe NV Manager exe PIF200 exe sqlnet log Standard Ini WorkOrderManager_001 exe XEditor_002 exe ...

Page 117: ...ice purposes LGE Internal Use Only 108 110 10 AUTO CALIBRATION 6 Click on Model Seletion 7 Click on LGA170 CLR Check D splay PASS OK 5 Click on Toolbar Icon 6 Set PORT using RS232 cable that PC can communicate with the phone LG A175 LG A175 LG A175 LG A175 LG A175 LG A175 LG A175 LG A175 LG A175 LG A175 ...

Page 118: ...Rx calibration In this procedure We can get RSSI correction value Set band EGSM and press Start button the result window will show correction values per every power level and gain code and the same measure is performed per every frequency 11 6 APC This procedure is for Tx calibration In this procedure you can get proper scale factor value and measured power level 11 7 ADC This procedure is for bat...

Page 119: ... power 1909 8 MHz 1880 MHz 1850 2 MHz Frequency 810 661 512 Channel PCS 1900 30 dBm 30 dBm 30 dBm Max power 1784 8 MHz 1747 6 MHz 1710 2 MHz Frequency 885 699 512 Channel DCS1800 33 dBm 33 dBm 33 dBm Max power 914 8 MHz 897 4 MHz 880 2 MHz Frequency 124 37 975 Channel EGSM 900 32 5 dBm 32 5 dBm 32 5 dBm Max power 848 8 MHz 836 8 MHz 824 2 MHz Frequency 251 191 128 Channel GSM 850 High Middle Low D...

Page 120: ...00 MBL00 ACQ03 Location Description ACQ00 Cover Assembly Rear EBR00 PCB Assembly Flexible EAJ00 LCD Module TFT EAB00 Speaker Dual Mode AEX00 Keypad Assembly Main MKC00 Window LCD SJMY00 Motor DC ACQ01 Cover Assembly Upper ACQ02 Cover Assembly Lower ACQ03 Cover Assembly Front GMZZ00 Screw Machine MBL00 Cap Screw GMEY00 Screw Machine EBR01 PCB Assembly Main SUMY00 Microphone Condenser MCBA00 Can Shi...

Page 121: ...Stamping Type MOBITECH CORPORATION 4 MCQ015700 Damper Connector MCQ66469301 COMPLEX LGA170 AGBRBK BK Black 4 MCQ000000 Damper MCQ66494101 COMPLEX LGA170 AGBRBK BK Black 4 MEZ000900 Label After Service MLAB0001102 COMPLEX C2000 CGRSV WA White C2000 USASV DIA 4 0 PRINTING 3 ACQ031100 Cover Assembly Folder ACQ85300106 LGA175 ACISWR WR WINE RED 4 EBR00 PCB Assembly Flexible EBR73248801 LGA170 AITAPW 1...

Page 122: ...EX LGA170 AGBRBK BK Black 5 MDS000000 Gasket MDS63650301 COMPLEX LGA170 AITAPW ZZ Without Color 5 MCQ049800 Damper Motor MCQ66469101 COMPLEX LGA170 AGBRBK BK Black 5 MCQ015700 Damper Connector MCQ66469001 COMPLEX LGA170 AGBRBK BK Black 5 MCQ074200 Damper Speaker MCQ66468901 COMPLEX LGA170 AGBRBK BK Black 5 MCK084400 Cover Upper MCK66531103 MOLD PC LUPOY HP 5004 LGA175 ACISWR WR WINE RED Drawing is...

Page 123: ...ntact MCE62232901 PRESS BECU 0 2 LGA170 AGBRBK BK Black 5 MCQ000000 Damper MCQ66688401 COMPLEX LGA170 AITAPW ZZ Without Color A170 Front Hinge Contact Support PAD 4 GMZZ00 Screw Machine GMZZ0017701 GMZZ0017701 BH 1 4mM 3mM MSWR NI PLT N ASIA BOLT 4 MBL00 Cap Screw MBL64819101 COMPLEX LGA170 AGBRBK BK Black 4 MCQ000000 Damper MCQ66564701 COMPLEX LGA170 AITAPW PW Pearl White 4 MEV000000 Insulator ME...

Page 124: ...out Color 2 MEZ047200 Label Master Box MLAJ0004402 COMPLEX CG300 CGR ZZ Without Color LABEL MASTER BOX for CGR TDR 2VER mbox_label 2 MEZ084100 Label Unit Box MLAQ0018301 COMPLEX GS200 CISBK ZZ Without Color PRINTING Unit Box Label CIS USE LGE Peel 90 40 2 MAF086500 Bag Vinyl MBAD0005204 COMPLEX LG LX260 SPRAG ZZ Without Color 2 MAY084000 Box Unit MAY65073303 COMPLEX LGA175 ACISWR ZZ Without Color ...

Page 125: ...0412 MCR01MZP5J122 1 2KOHM 5 1 16W 1005 R TP ROHM 7 Q101 TR Bipolar EQBN0007101 2SC5585 NPN 6V 15V 12V 500mA 100mA 680 150mW EMT3 R TP 3P ROHM 7 R105 Resistor Chip ERHZ0000406 MCR01MZP5J104 100KOHM 5 1 16W 1005 R TP ROHM 7 R101 Resistor Chip ERHZ0000486 MCR01MZP5J473 47KOHM 5 1 16W 1005 R TP ROHM 6 R401 Resistor Chip ERHZ0000401 MCR01MZSJ000 0OHM 5 1 16W 1005 R TP ROHM 6 C217 C228 C229 C231 C232 C...

Page 126: ... Capacitor Ceramic Chip ECCH0000120 MCH155A390J 39pF 5 50V NP0 55TO 125C 1005 R TP ROHM Semiconductor KOREA CORPORATION 6 R110 R227 R228 R301 R311 Wire Pad Short SAFP0000501 LG VS760 VRZ 6 R221 R223 R317 R322 Resistor Chip ERHZ0000443 MCR01MZP5J222 2 2KOHM 5 1 16W 1005 R TP ROHM 6 C108 C115 Capacitor Ceramic Chip ECCH0002002 C1005X7R1A473KT000F 47000pF 10 10V Y5P 30TO 85C 1005 R TP TDK CORPORATION...

Page 127: ... 25 0 6 ohm 0 3A SMD R TP 2P 0 MURATA MANUFACTURING CO LTD 6 C107 C117 C122 C307 Capacitor Ceramic Chip ECZH0001216 C1005X5R1A224KT000E 220nF 10 10V X5R 55TO 85C 1005 R TP TDK KOREA COOPERATION 6 C222 C223 Capacitor Ceramic Chip ECCH0006501 GRM21BR60J106K 10uF 10 6 3V X5R 55TO 85C 2012 R TP MURATA MANUFACTURING CO LTD 6 C220 Capacitor Ceramic Chip ECCH0000198 CL05A225MQ5NSNC 2 2uF 20 6 3V X5R 55TO...

Page 128: ...3 GRM188R61A225K 2 2uF 10 10V X5R 55TO 85C 1608 R TP MURATA MANUFACTURING CO LTD 6 VA101 VA102 Varistor SEVY0004101 ICVN0505X150FR 5 6V 0 360F 1 0 0 5 0 55 NONE SMD R TP INNOCHIPS TECHNOLOGY 6 C202 Capacitor Ceramic Chip ECCH0007803 CL10A106MP8NNNC 10uF 20 10V X5R 55TO 85C 1608 R TP 0 8MM SAMSUNG ELECTRO MECHANICS CO LTD 6 R348 R409 Resistor Chip ERHZ0000485 MCR01MZP5J472 4 7KOHM 5 1 16W 1005 R TP...

Page 129: ... 183P BGA R TP 183P INFINEON TECHNOLOGIES ASIA PACIFIC PTE LTD 6 C134 Capacitor Ceramic Chip ECCH0003002 C2012Y5V1A106ZT000N 10uF 20TO 80 10V Y5V 30TO 85C 2012 R TP TDK CORPORATION 6 U203 IC MUIC EAN61847601 RT8964G 2 8 to 5 5 1mSEC 1mSEC 1 471W 2 MUIC Lite Version WQFN R TP 16P RICHTEK TECHNOLOGY CORP 6 R402 R403 R405 Resistor Chip ERHZ0000201 MCR01MZP5F1000 100OHM 1 1 16W 1005 R TP ROHM 6 U201 I...

Page 130: ...93 39KOHM 5 1 16W 1005 R TP ROHM 6 C131 C132 C225 Capacitor Ceramic Chip ECCH0000115 MCH155A220JK 22pF 5 50V NP0 55TO 125C 1005 R TP ROHM Semiconductor KOREA CORPORATION 6 R107 Resistor Chip ERHZ0000475 MCR01MZP5J392 3 9KOHM 5 1 16W 1005 R TP ROHM 6 R109 Resistor Chip ERHZ0000529 MCR01MZP5J152 1 5KOHM 5 1 16W 1005 R TP ROHM 6 R303 R309 Resistor Chip ERHZ0000488 MCR01MZP5J4R7 4 7OHM 5 1 16W 1005 R ...

Page 131: ...D HONGKONG BRANCH 6 VA401 ZD201 Diode TVS EDTY0008606 PRSB6 8C 4 7V 5 7 10W R TP 2P 1 PROTEK DEVICES INC 6 Q401 TR Bipolar EQBN0019201 KTC3770V VSM 0 1 W R TP 1 2 1 2 0 5 Vcbo 20 Vceo 12 Vebo 2V Ic 100mA KEC CORPORAITION 6 L201 Inductor Multilayer Chip ELCH0001556 LL1608 FSLR27J 270NH 5 150mA 3 5OHM 470MHZ 8 SHIELD NONE 1 6X0 8X0 8MM R TP TOKO INC 6 L403 Inductor Multilayer Chip ELCH0005004 HK1005...

Page 132: ... EGSM DCS RX 942 5 1842 5 1 8 1 4 0 74 SMD R TP EPCOS PTE LTD 6 L402 Inductor Multilayer Chip ELCH0003814 LQG15HS5N1S02D 5 1NH 0 3NH 300mA 0 2OHM 5 3GHZ 8 SHIELD NONE 1 0X0 5X0 5MM R TP MURATA MANUFACTURING CO LTD 6 R103 R104 R216 R218 R225 R226 Resistor Chip ERHZ0000405 MCR01MZP5J103 10KOHM 5 1 16W 1005 R TP ROHM 6 C336 C337 C338 C339 C340 C341 C342 C343 Capacitor Ceramic Chip ECCH0000112 MCH155C...

Page 133: ...MENTS INC 6 C217 C228 C229 C231 C232 Capacitor Ceramic Chip ECCH0000117 CL05C270JB5NNNC 27pF 5 50V NP0 55TO 125C 1005 R TP 0 5 SAMSUNG ELECTRO MECHANICS CO LTD 6 R312 Resistor Chip ERHZ0000505 MCR01MZP5J681 680OHM 5 1 16W 1005 R TP ROHM 6 R110 R227 R228 R301 R311 Wire Pad Short SAFP0000501 LG VS760 VRZ 6 R219 R220 Resistor Chip ERHZ0000204 MCR01MZP5F1003 100KOHM 1 1 16W 1005 R TP ROHM 6 L408 Induc...

Page 134: ...RATION 6 L303 Inductor Multilayer Chip ELCH0001402 LL1005 FHL18NJ 18NH 5 300mA 0 6OHM 2 8GHZ 10 SHIELD NONE 1 0X0 5X0 5MM R TP TOKO INC 6 C209 Capacitor Ceramic Chip ECZH0000844 C1005C0G1H680JT000F 68pF 5 50V NP0 55TO 125C 1005 R TP TDK KOREA COOPERATION 6 C104 C105 C110 C118 C119 C120 C124 C129 C216 C234 C303 Capacitor Ceramic Chip ECZH0003103 GRM36X7R104K10PT 100nF 10 10V X7R 55TO 125C 1005 R TP...

Page 135: ...l Operation MFL67106410 COMPLEX LGA175 ACISPW ZZ Without Color LGA175 manual for CIS 2 SBPL00 Mobile Phone Battery Li Ion SBPL0090501 KU250 553450 LGC EU KU250 553450 LGC EU 3 7 V 950 mAh 1 CELL PRISMATIC KU250 Europe BATT IP Pb Free LG CHEMICAL 2 EAB010200 Earphone Stereo SGEY0003218 EMB LGE011STKC 3mW 16OHM 115DB 85HZTO126HZ 1M BLACK 5PIN 5 CRESYN CO LTD 2 EAY060000 Adapters SSAD0034901 STA U35R...

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