LG MG210 Service Manual page 86

Checking PAM Circuits (Tx pass continued)
Checking Points
Tx PAM Circuit Diagram
R410
R414
PA_BAND
PA_ON
Control signal is OK. See next page to
VRAMP
PA_BAND
PA_ON
VRAMP
VBAT
C425
C423
33u
R411
100p
300
1
DCS_PCS_IN DCS_PCS_OUT
2
BAND_SELECT
3
TX_ENABLE
4
VBATT U401
RF3166
5
GND
6
VRAMP
7
GSM_IN
R415
300
- 85 -
4. TROUBLE SHOOTING
Checking Flow
Check VRAMP,
PA_ON, PA_BAND
No
Normal?
Yes
Check FEM & Mobile SW
R412
0
C427
1000p
R413
0 C431
1000p
R416
0 C433
27p
L406
9
2.7nH
26
GND17 C428 C429
27
GND18 NA 0.5p
28
GND19
29
GND20
30
GND21
31
GND22
32
GND23
L407
8
GSM_OUT
8.2nH
C434 C435
2.2p 3.3p
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