LG Nexus 5 Service Manual

3. TROUBLE SHOOTING
- 31 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only
BOT
SW2000
RF Switch
FL2003
DRx
Separator
U2004
RF  Transceiver
FL13002
Separator
U1000
Separator
FL1005B20Duplexer
FL1001B5/B6B19Duplexer
FL1013B2DuplexerFL1018Separator
FL1012B4Duplexer
FL1013B3Duplexer
FL1020B1/B4Separator
FL1007B1Duplexer
U2001B1,4/B2/B3DRx Separator
U2007B7DRx Separator
FL2012B7 DRxSeparatorFL2014B7 DRx SAW
DRx SAWFL2002/ 2001 /2000   B3/ B2...

3. TROUBLE SHOOTING
- 32 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only
RF component
Reference No.DescriptionReference No.Description
FL1001B5, B6 GSM850 DuplexerFL1002B5, B6 Low Pass Filter
FL1003B8, GSM900 DuplexerFL1004B8 Low Pass Filter
FL1005B20 DuplexerFL1006B20 Tx Saw Filter
FL1007B1 DuplexerFL1008B2, GSM1900 Duplexer
FL1012B4 DuplexerFL1013GSM 1800 Duplexer
U2005GPS LNAFL1018B1, B2, B4, GSM1800, GSM1900 
Separator
FL1020B1, B4...

3. TROUBLE SHOOTING
- 33 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only
3.2 SIGNAL PATH
TOP/BOT

1. WCDMA, LTE B1 TX PATH
2. WCDMA B4 TX PATH
3. WCDMA B2 TX PATH
4. WCDMA B8 TX PATH
5. GSM_HB TX PATH
6. GSM_LB TX PATH
7. COMMON High Band TX/RX PATH
8. COMMON Low Band TX/RX PATH

9.WCDMA, LTE B5 / WCDMA B6 / TX PATH

10. LTE B20 TX PATH

11. LTE B7 TX PATH
WCDMA/LTE/CDMA/GSM TX flow
TOP   

3. TROUBLE SHOOTING
- 34 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only
BOT  

3. TROUBLE SHOOTING
- 35 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only
- WCDMA/LTE/CDMA/GSM PRX flow
1. WCDMA, LTE B1 PRX PATH
2. WCDMA B4 PRX PATH
3. WCDMA B2 / GSM 1900 PRX PATH
4. WCDMA, LTE B8 / GSM900 PRX PATH
5. LTE B3 / GSM 1800 PRX PATH
6. COMMON High Band TX/RX PATH
7. COMMON Low Band TX/RX PATH
8. WCDMA, LTE B5 / WCDMA B6 / GSM850 PRX PATH
9. LTE B20 PRX PATH
10. LTE B7 TX PATH   

3. TROUBLE SHOOTING
- 36 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only
- WCDMA/LTE/CDMA DRX flow
1. WCDMA, LTE B1 / WCDMA B4 DRX PATH
2. WCDMA B2 DRX PATH
3. WCDMA, LTE B8 DRX PATH
4. WCDMA, LTE B5 / WCDMA B6 DRX PATH
5. LTE B20 DRX PATH
6. LTE B7 DRX PATH   

3. TROUBLE SHOOTING
- 37 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only
3.3 Checking XO Block
The output frequency (19.2MHz) of XO (X6000) is used as the reference one of WTR1605L(U2004) and PM8941(U6002) 
nternal VCO.
X6000
TP1
U2004
TP2
BOT
TOP  

3. TROUBLE SHOOTING
- 38 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only
Schematic of the Crystal Part (19.2MHz)
EAW62063901X6000
1RAA19200AAA
19.2MHz
2
1 3
4SENSORXTAL2
XTAL1GND1
C6027
0.1uC6028
1n
R6031
DNI
DNI R6033
R6032
DNI
13'1/21
DNI(100K,1%)
DNI(0 ohm)
TP1
DNI
C2078
0
R2017100p
C2027
79 120XO_IN
VTUNE_PRX
XO_OUT_A0
TP2   

3. TROUBLE SHOOTING
- 39 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only
Check TP1
1.9 .2 MHz SingleCheck the X6000
No
Yes
Check TP2
19.2MHz SignalCheck the U6002
No
Yes
XO OK  

3. TROUBLE SHOOTING
- 40 -Copyright © 2013 LG Electronics. Inc. All right reserved.Only for training and service purposesLGE Internal Use Only
3.4 Checking RF Front-end Separator
3.4.1 FL1018 (High Band)
Check the supply voltage and control level for FL1018/U1000
FL1018
Separator
TP2
TP1
TP3
BOT
L1054
DNI
LMSP32QP-F03
EAT61793601FL1018
23
11
10
8 9
6 7
5 13
4 12
2 15
14
20
17
21
16
22
19
3
18
1
TRX2
VDD
TRX10
VIO
TRX3
TRX4
SCLK
GND5
SDATA
TRX6TRX5
TRX1
GND4
GND1
TRX7
TRX9
GND2TRX8
TX1LBTX2HB
GND3ANT...