4. TROUBLE SHOOTING
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Copyright © 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
C1109
DNI
C1104
DNI
C1096
2.2u
1950MHz
FL1004
5 3 2
4
1
IN
OUT
G1
G2
G3
2.2u
C1081
C1080
330p
C1095
680p
0.5p
C1090
C1088
DNI
110
R1018
R1019
110
DNI
C1110
3.3n
C1087
680p
C1097
VBAT
C1082
330p
VBAT
FL1008
897.5MHz
5 3 2
4
1
IN
OUT
G1
G2
G3
49.
9
R1022
3.9n
L1021
DNI
C1112
DNI
C1108
4.7n
C1101
FL1007
7
5
8
4
9
2
3
1
6
ANT
RX1
TX
GND1
GND5
GND2
RX2
GND3
GND4
C1076
DNI
L1031 3.3p
3.3p
L1029
L1033
5.6n
0.75p
C1091
L1015 2n
3.6n
L1016
C1107
DNI
L1102 12n
FL1006
1950MHz,2140MHz
7
5
8
4
9
2
3
1
6
ANT
RX
TX
GND1
GND6
GND2
GND5
GND3
GND4
8.2p
C1085
C1089
DNI
L1022 10p
33p
C1111
6.8n
C1103
C1116
8.2n
L1034 3.9p
27n
C1117
L1020
DNI
U1002
6
4
8
3
7
10
1
2
9
5
11
PGND
VEN
RF_OUT
RF_IN
VBAT
VCC
GND
VMODE1
CPL_IN
VMODE0
CPL_OUT
U1003
6
4
8
3
7
10
1
2
9
5
11
PGND
VEN
RF_OUT
RF_IN
VBAT
VCC
GND
VMODE1
CPL_IN
VMODE0
CPL_OUT
L1023
4.7n
C1093
DNI
C1094
DNI
51
R1017
PA_ON0
PA_R0
PA_R0
PA_ON1
3G_PAM_MODE
3G_PAM_MODE
W850_W900_RTX
W1900_W2100_RTX
W1900_W2100_TX_OUT
W850_W900_TX_OUT
RX_WCDMA_900_M
RX_WCDMA_900_P
PDET_IN
RX_WCDMA_HB
8dB
Close to pin1
Band I
Band VIII
REV_1.1
REV_1.1
TP2
TP3
TP1
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