LG MG810c Service Manual page 72

M. RF Transmitter Path Trouble Shooting
(PAM Control Signal)
GSM_OUT
8
GND23
32
GND22
31
GND21
30
GND20
29
GND19
28
GND18
27
GND17
26
DCS_PCS_OUT
9
VBAT
GSM_IN
7
VRAMP
6
GND
5
RF3166
U401 VBATT
4
TX_ENABLE
3
BAND_SELECT
2
DCS_PCS_IN
1
C408 C517
33u
NA
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4. TROUBLE SHOOTING
4dB Atten
R401 R402 R403
220 24 220
R405 220 0603
C405
27p
0603
R407 220 0603
R408 220 0603
3dB Atten
R410 R411 R412
300 18 300
C518
NA
RFOL
APC
PA_ON
PA_BAND
RFOH