3. TROUBLE SHOOTING
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Copyright © 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Set the phone Tx is ON and
PDM is 210
Check TP3 Over 21dBm?
RF Tx Level is OK
Yes
No
Change the board
Check TP2 PA_R0
≥
2.6V
Check MSM7225A
Yes
No
Check TP1 Over 10 dBm?
Check RTR6285A
Yes
No
C1108
DNI
U1003
6
5
7
4
8
3
9
2
10
1
11
PGND
VCC1
VCC2
RFIN
RFOUT
VMODE_1
CPL_IN
VMODE_0
GND
VEN
CPL_OUT
U1002
6
5
7
4
8
3
9
2
10
1
11
PGND
VCC1
VCC2
RFIN
RFOUT
VMODE_1
CPL_IN
VMODE_0
GND
VEN
CPL_OUT
FL1004
5 3 2
4
1
IN
OUT
G1
G2
G3
3.9n
L1034
C1116
1.2p
2.7p
L1029
C1117
DNI
L1031
2.7p
C1076
1.8p
C1109
100p
100p
C1110
100p
L1022
49.9
R1022
51
R1017
1.2p
L1021
C1085
2.7n
C1112
0.5p
5.6n
L1033
VBAT
FL1007
7
5
8
4
9
2
3
1
6
ANT
RX1
TX
GND1
GND5
GND2
RX2
GND3
GND4
C1082
330p
100p
C1094
VBAT
C1097
680p
1
2
C1091
1p
C1093
100p
10n
C1089
R1019
110
R1018
110
C1095
680p
330p
C1080
2.2u
C1081
12n
L1016
2.2u
C1096
DNI
C1104
C1101 1n
2.4n
L1015
DNI C1107
33p
L1102
22
R1020
220
R1026
220
R1024
1.8n
C1111
C1090
100
C1088
100
22
C1087
22
L1023
15n
C1103
1.8n
L1020
FL1006
7
5
8
4
9
2
3
1
6
ANT
RX
TX
GND1
GND6
GND2
GND5
GND3
GND4
FL1008
5 3 2
4
1
IN
OUT
G1
G2
G3
DNI
C1200
PA_ON0
PA_R0
PA_R0
PA_ON1
RX_WCDMA_HB
3G_PAM_MODE
3G_PAM_MODE
W850_W900_TX_OUT
PDET_IN
RX_WCDMA_900_P
RX_WCDMA_900_M
W1900_W2100_RTX
W850_W900_RTX
W1900_W2100_TX_OUT
Band II
WCDMA DUAL
Band V
4dB attunation
Close to pin1
8dB
TP2
TP3
TP1