LG Nexus 5 Service Manual
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3. TROUBLE SHOOTING - 171 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only 3.16 Proximity Sensor on/off troubleshooting Proximity Sensor is worked as below: Call Button click -> Phone number click -> Call connected -> Move objects in front of the sensor-> Control automatically the screen’s on/off operation Check TP11002 Yes Yes Yes START LCD off? Change the U11002 Is the function normal operation? Change the Proxi/light Sensor IC (U11002) No No Click send button &Click Phone Number & Call connected Move objects in front of the Proximity sensor Output work well? END END END No
3. TROUBLE SHOOTING - 172 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only < Proximity/Light Sensor > < Main PCB _Top > U11002 (APDS9930) Proximity Sensor TP11002 ZD11002 EDTY0012501 UCLAMP3311TTP11002 R11003DNI +1V8_VREG_LVS1 ZD11001 EDTY0012501 UCLAMP3311T U11002 EAN62568201 APDS-9930-200 9 3 5 4 6 7 2 8 1 SDAVDD INTSCL GND LEDKLEDA LDR NCC11007 2.2u +3V0_VREG_L17 R11011 22 SENSOR2_I2C_SDA SENSOR2_I2C_SCLPROXIMITY_INT [Check supply voltage accuracy 3%, 2.91V-3.09V] Add : revB->revC (0531 )Change:revB->rev11_update(0903) Change:revB->rev11_update(0903) Add : revB->revC (0531) 0.3mm 0.3mm U11002 TP11002
3. TROUBLE SHOOTING - 173 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only 3.17 Light Sensor on/off trouble Light Sensor is worked as below: Menu Key click -> Settings click -> Display click -> Brightness click -> Automatic brightness click Check the Pad of TP1(C11007), 3V Yes Yes Yes START Changing Brightness? Check the pad of TP2 (R11003), Proximity int Is the function normal operation? Change the Proxi/light Sensor IC (U11002) No No Click settings & Click Display and Brightness & Click Automatic brightness Watch the brightness of display Output work well? END END END No
3. TROUBLE SHOOTING - 174 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only < Main PCB _Top > U11002 (APDS9930) Proximity Sensor TP11002 Check 3V(C11007) Proximity_INT(R11003) < Proximity/Light Sensor > ZD11002 EDTY0012501 UCLAMP3311TTP11002 R11003DNI +1V8_VREG_LVS1 ZD11001 EDTY0012501 UCLAMP3311T U11002 EAN62568201 APDS-9930-200 9 3 5 4 6 7 2 8 1 SDAVDD INTSCL GND LEDKLEDA LDR NCC11007 2.2u +3V0_VREG_L17 R11011 22 SENSOR2_I2C_SDA SENSOR2_I2C_SCLPROXIMITY_INT [Check supply voltage accuracy 3%, 2.91V-3.09V] Add : revB->revC (0531 )Change:revB->rev11_update(0903) Change:revB->rev11_update(0903) Add : revB->revC (0531) 0.3mm 0.3mm U11002 TP11002 TP1(C11007) TP2(R11003)
3. TROUBLE SHOOTING - 175 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only 3.18 NFC 3.18.1 NFC components Reference No.DescriptionReference No.Description U15004BCM20793M, NFC ICX15000Crystal 1 4 A B C D E F G TP15004 R15040 TP15007 C15028 U15004 R15028 R15029 C15030 R1503 3 C15041 R15031 TP15002TP15001X15000 C15039 C15037 C15040 C15038 C15031 C1504 3 C1504 4 C1504 2 TP15000 C15045 L15001 C10006 R15030 C15027 C15032 C15047 R15027 C15033 L15002 C10005 R15034 C15034 C15036 R15038 R15039 C15046 R15043 R15041 R15042 C15003 C15000 C15001 C15002 C15020 C15022 C15053 C15018 C15019 C15052 ANT15003 R15016 ANT15002 R15000 R15005 U15000 R15001 R15012 C150 11 C15013 C15016 ANT15000 ANT15001 U15001 C15017 C15015 R15006 R15014 R15013 R1501 1 ZD1500 2 R15017R15018 R15019 C15010 ZD1500 1 C15021 C15004 C15014 C15009 NFC IC Crystal
3. TROUBLE SHOOTING - 176 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only 3.18.2 NFC Signal Path NFC Rx / Tx Common Signal Path 1 4 A B C D E F G TP15004R15040TP15007 C15028 U15004 R15028 R15029 C15030 R1503 3 C15041 R15031 TP15002TP15001X15000 C15039 C15037 C15040 C15038 C15031 C1504 3 C1504 4 C1504 2 TP15000 C15045 L15001 C10006 R15030 C15027 C15032 C15047 R15027 C15033 L15002 C10005 R15034C15034 C15036 R15038R15039 C15046 R15043 R15041 R15042C15003 C15000 C15001 C15002 C15020 C15022 C15053 C15018 C15019 C15052 ANT15003 R15016 ANT15002 R15000R15005 U15000 R15001 R15012 C150 11 C15013 C15016 ANT15000 ANT15001 U15001 C15017 C15015 R15006 R15014 R15013 R1501 1 ZD1500 2 R15017R15018 R15019 C15010 ZD15001 C15021 C15004C15014C15009 NFC IC Ant. Matching Crystal Tx/Rx_1 Tx/Rx_2
3. TROUBLE SHOOTING - 177 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only START ANT 15000/15001 Check the Connection Between antenna and Clip Replace Antenna in Battery Cover or Clip No Yes Yes F_SUB Change Yes Check antenna Matching at C15030/C15036 C15032/15034, R15031/R15034 Check RF Line Tx / Rx Line Check The Component Around Antenna Check The Component Tx / Rx Line No No
3. TROUBLE SHOOTING - 178 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only 3.19 Power ON Troubleshooting The main power source of D821/D821 is provided by 2 chips which are PM8941 and PM8841. Since MSM8974 only powers up normally when MSM8974 is properly powered therefore, PM8941 is the actual one to take look at. Power ON sequence of D821/D821 is below. 1. PM8941 receives a poweron trigger (e.g. KPD_PWR_N press). 2. PM8941 poweron sequence begins (PBS sequence runs). The following take place: - BMS OCV measurement occurs. - EXT_REG_EN1 is asserted (VPH_PWR) to enable external supplies. - PON_OUT is asserted (1.8 V) to enable PM8841. - A timer starts to allow PM8841 to complete his sequence. 3. PM8841 receives poweron trigger (PON_1 and PS_HOLD are asserted). 4. PM8841 poweron sequence begins (PBS sequence runs). The following take place: - S1 is turned ON (memory supply). - S2 is turned ON (core supply). 5. PM8841 PBS sequence completes. Since PM8841 PS_HOLD is already high, the PM8841 sequence completes. PM8841 is on. 6. PBS sequence on PM8941 continues. - The timer on PM8841 expires. - The rest of the power sequence (regulators, clocks) are enabled in several steps. 7. The PM8941 PBS sequence completes. PM8941 PON module deasserts PON_RESET_N and sets PS_HOLD timer. 8. Once PON_RESET_N is deasserted, MSM comes out of reset. and PBL will assert PS_HOLD. PM8941 is on. 9. After FLCB, secondary poweron sequence takes place.
3. TROUBLE SHOOTING - 179 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only 3.19.1 Power ON Troubleshooting (MSM8974) Battery voltagehigher than 3.3V?Change or charging the BatteryNo Yes Check SDRAM(U5000) And eMMC(U5001) Press PWR KeyTP : R11010Come high to low? Yes Yes Yes Check PM8941Vreg xx level Check PM8841Vreg xx level Check PM8941 (U6002) Check PM8841 (U7000) Check Power Key, Pin 1 of KBR11000No Start Yes Yes Yes Yes Yes Yes PON_OUT pinOf PM8941 is High? (1.8V) PON_RESET_N pinOf PM8941 is High?(1.8V) Check Main ClockTP : X6000 (19.2MHz) SMPS_1B,2B ofPM8841 is high?(more than 0.9V) VOUT pin U6000Is battery level Or more than 3.5V? PS_HOLD pinOf MSM8974 is High?(1.8V) No No Check PM8941 (U6002) Check PM8941 (U6002) Check PM8941 (X6000) Check PM8841 (U7000) Check Bypass Boost (U6000) Check MSM8974 (U3000) No No No No No No
3. TROUBLE SHOOTING - 180 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only U5003 U3000 U6002 X6000 U6000 R11010 KBR11000 TOP