LG -V909DW Service Manual page 70

Power level check at Antenna switch
Power level checking at output stage of Power amplifier
C200
DNI
TP3
TP4
Check power level in front of Power amplifier from MDM6200
LGE Internal Use Only
SW200
TP2
R129
4.7K
FIG 12 Antenna Switch Schematic
C201
1.8p
L200 4.7n
C216 2.2n
C219
L201
DNI
0.5p
FIG 13 GSM Power Amplifier Schematic
TP5
C212
C214
DNI
TP6
C222
C224
DNI
FIG 14 Schematic of GSM Output power of MDM6200
12
VC4
13
VDD GSM850RX1
14
GND1
15
ANT GSM1800/1900RX2
16
GND3 GSM1800/1900RX1
17
UMTS1
L202
100n
GSM_PA_BAND MODE
LOW GSM
HIGH DCS/PCS TP1
C203 C209 C210
C202 C204
47p 100p 8p
2.2u 2.2u
U200
17
PGND
16 1
RFOUT_HB RFIN_HB
15 2
GND6 VBATT
14 3
GND5 VEN_HB
13 4
VCC VMODE0
12 5
GND4 VMODE1
11 6
GND3 VEN_LB
10 7
GND2 GND1
9 8
RFOUT_LB RFIN_LB
C226 C227
39p 39p
33p
TX_GSM_HB
C215
DNI
33p
TX_GSM_LB
C225
DNI
- 70 - Copyright © 2011 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
5
4
GND2
3
2
1
TRX_W2100
UMTS3
TRX_AWS
TRX_W900
VBAT
C211
47u
GSM_H_PAM_ON
R0
R1
GSM_L_PAM_ON
C228 C229
39p 39p
Only for training and service purposes