LG LG-P970 - Checking GSM TX Module(GSM PAM + FEM) Block

4. TROUBLE SHOOTING
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Only for training and service purposes
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4.4 Checking GSM TX Module(GSM PAM + FEM) Block
Schematic of the TX Module
VBATT(TP1)
TP1
L133
1.2n
C152
22p
C170
1.8p
C179 0.1u
C185 15p
10n
C151C150
22u
1u
C178
VBAT
VBAT
C180
15p
U104
5
4
72
20
6
2
19
25
18
24
23
16
22
15
21
14 12
3
1
11
2
10
3
9
1
8
6
7
17
VCMOS
RXTX_H
GND3
GND4
ANT
RXTX_M1
RX_L1
GND5
GND1
RX_M2
B
H_
3
Q_V
RX_M3TX_HB
DRW
GND_HB
SS
VRAMP
DET
GND_LB
GND_SPI
TX_LB
VSPI
BL_3Q_V
CLK
G
U
LS_
G
GND2
RXTX_L2
C171
1.8p
RX_1800DCS_PCS_TX
PA_RAMP
PA_POW_DET
VSPI
GSM_TX
RX_850
DRW
SS
CLK
RX_1900
TP1