LG LG-V909DW - Page 70

4. TROUBLE SHOOTING
- 70 -
Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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ͽ͸Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΀ΟΝΪ
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Power level check at Antenna switch
FIG 12 Antenna Switch Schematic
Power level checking at output stage of Power amplifier
FIG 13 GSM Power Amplifier Schematic
Check power level in front of Power amplifier from MDM6200
FIG 14 Schematic of GSM Output power of MDM6200
{wGY
{wGZG
{
wG[G
{
wG\G
{
wG]G
{
wGX
206LF
12 02 91
12
81
01
16
13
8 9 7 6
11
5
414
315
2
117
UMTS1
UMTS3
GSM1800/1900RX1
ANT GSM1800/1900RX2
GND1 GND2
GSM850RX1
3CV 2XR058MSG 1XT0091/0081MSG 1CV
XT009/058MSG
VDD
GND3
2CV
4DNG
VC4
2STMU
5DNG
DNGP
p081
812C
SW200
4 2 1 3
1G
A C
2G
100n
L202
4.7K
R129
TRX_W2100
TRX_W900
TRX_AWS
47u
C211
47p
C203
8p
C210
DNI
C200
1.8p
C201
100p
C209
DNI
C219
39p
C227
0.5p
L201
39p
C229
39p
C228
4.7nL200
39p
C226
U200
12
13
14
15
16
17
6
5
7
4
8
3
9
2
10
1
11
GND3
RFIN_HB
GND2
VBATT
RFOUT_LB
VEN_HB
RFIN_LB
VMODE0
GND1
VMODE1
VEN_LB
PGND
RFOUT_HB
GND6
GND5
VCC
GND4
2.2nC216
2.2u
C204
2.2u
C202
VBAT
GSM_L_PAM_ON
GSM_H_PAM_ON
R0
R1
MODE
LOW
HIGH DCS/PCS
GSM_PA_BAND
GSM
DNI
C214
33p
C222
DNI
C225
DNI
C215
DNI
C224
33p
C212
TX_GSM_LB
TX_GSM_HB
TP2
TP3
TP1
TP4
TP5
TP6