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
RF Tx Level is OK
Yes
Check PAM Block
Refer to 1.5.4
Check TX Module
Yes
No
Check Duplexer
Yes
No
Check RTR6285A
Yes
No
No
Check TP1 Over 21dBm?
Check TP2 Over 21dBm?
Check TP3 Over 21dBm?
Check TP4 Over 7dBm?
Check ANT_SEL 0,1,2
(High, Low, Low)
RTR6285 Maximum output Power = 7 dBm
RTR6285 minimum output Power = -80 dBm
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
FL1004
5
3
2
4
1
IN
OUT
G1 G2 G3
c1085
1.5n
C1116
2.7p
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
L1031 10n
C1117
DNI
R1020
DNI
L1015 2.4n
C1109
100p
100p
C1110
49.9
R1022
L1033
8.2n
51
R1017
C1091
DNI
C1112
DNI
L1020
1.8n
C1076
1.8p
VBAT
C1089
10n
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
L1016
12n
C1093
100p
R1027
100
R1019
110
R1018
110
C1095
680p
330p
C1080
2.2u
C1081
DNI
C1090
2.2u
C1096
DNI
C1103
2
C1104
12n
DNI
C1107
R1026
DNI
C1131 1.2n
C1111 33p
FL1006
7
5
8
4
9
2
3
1
6
ANT
RX
TX
GND1
GND6
GND2
GND5
GND3
GND4
C1134
100p
L103
4
5.6n
100p
C1135
L1029 10n
3.3p
L1022
R1024
DNI
C1132
10
L1021
1.2p
C1133
DNI
FL1008
5 3 2
4
1
IN
OUT
G1
G2
G3
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_TX_OUT
W1900_W2100_RTX
W850_W900_RTX
Band I
WCDMA DUAL
Band V
Close to pin1
8dB
TP2
TP3
TP4