4. TROUBLE SHOOTING
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Copyright © 2012 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_RO
≥
2.6V
Check MSM7225A
Yes
No
Check TP1 Over 10 dBm?
Check RTR6285A
Yes
No
L1034
10n
DNI
L1016
10n
L1031
C1078
8.2n
U1004
6
7
4
8
3
5
9
2
10
1
11
PGND
VCC1
VCC2
RFIN
RFOUT
VEN
NC
ISO
VMODE
GND
CPL
C1079
DNI
L1026
3.3n
L1027
1.8n
FL1008
7
5
9
4
2
3
8
1
6
ANT
RX1
RX2
TX
GND1
GND2
GND5
GND3
GND4
L1039
1.5n
FL1007
5 3 2
4
1
IN
OUT
G1
G2
G3
C1038
100p
FL1004
1950MHz,2140MHz
7
5
8
4
9
2
3
1
6
ANT
RX
TX
GND1
GND6
GND2
GND5
GND3
GND4
2.2n
L1030
C1076
100p
C1080
DNI
C1074
2.7p
L1028
1n
C1087
12n
DNI
L1032
R1023
180
R1024
180
L1044
22n
L1041
39p
L1045
6.2n
L1046
2.7p
C1096
2.7n
C1097
18n
L1043
3.3p
C1092
6.8n
L1040
10n
L1042
39n
C1093
100p
C1089
100p
R1022
43
L1024
1n
C1065
6.8p
C1073
DNI
FL1005
1950MHz
5 3 2
4
1
IN
OUT
G1
G2
G3
1n
C1070
VBAT
2.7p
C1077
L1029
3.3n
R1021
49.9
C1067
10u
C1068
33p
U1003
7
4
3
5
2
6
1
RFIN
RFOUT
EN
RREF
GS
VCC
PGND
VBAT
C1084
10u
C1063
10n
R1017
27K
C1082
100p
VREG_TCXO_2.85V
C1059
10p
L1020
2n
100p
C1083
C1085
33p
C1099
100p
100p
C1100
C1086
1n
U1005
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
C1062
100p
C1058
DNI
PA_ON0
PA_ON1
PA_R0
PA_R0
RX_WCDMA_900_M
RX_WCDMA_900_P
WCDMA_900_TX_OUT
WCDMA_2100_TX_OUT
PDET_IN
WCDMA_LB_RTX
WCDMA_HB_RTX
EXT_LNA_EN
RX_WCDMA_1900
RX_WCDMA_2100
WCDMA DUAL
SDPY0004701
ACMD-7407
BC 2
SDMY0003001
B7697
BC 1
[Duplexer]
BC 5
SDDY0005101
B7671
B7953
SDMY0002801
BC 8
W900
6dB Atten.
W900 Tx (880-915MHz)
W2100 Tx (1920-1980MHz)
TP1
TP3
TP2