LG U310 Service Manual page 89

4. TROUBLE SHOOTING
4.6.2 Checking Ant. SW Module
Refer to chapter 4.4
4.6.3 Checking RF Tx level
TP2
TP1
Test Point (RF Tx Level)
ANT_SEL0
ANT_SEL1
ANT_SEL2
TP1
SW1000
R1038
G2
ANT RF
G1
0
KMS-512
C1003
L1007
10nH NA C1005
33p
FL1000
DGM092M03
9
PCN_PCS_TX EGSM_RX1
EGSM_RX2
11
GSM850_EGSM_TX PCN_RX1
PCN_RX2
21
WCDMA2100 PCS_RX1
PCS_RX2
4
CTRL1 GSM850_RX1
5
CTRL2 GSM850_RX2
6
CTRL3 VDD
C1018 C1019 C1020
33p 33p 33p
C1025 33p C1026
L1022
10nH
C1041 100p
C1049
NA
TP2
Schematic of RF Tx Level
L1011
VREG_RFRX_0_2.85V
7.5nH
12
13
14
15
16
17
18
19
7
C1015
10p
C1016
0.01u
TP3
C1024
0.01u
C1028
33p
68p
15
DCS_PCS_OUT DCS_PCS_IN
11
EGSM_OUT U1001
19
RSVD_GND
SKY77318
C1042 33p
21
P_GND
SMPY0014001
- 90 -
TP3
+VPWR
C1013
33u
C1027 C1023
22u
0.01u
3
4
EGSM_IN
R1017 100ohm
18
GSM_PA_EN
ENABLE
C1044
1
BS 15p
R1024 100ohm
GSM_PA_BAND
C1058
15p