Gsm Transmitter - Samsung SGH-Q105 Service Manual

SGH-Q105 Flow Chart of Troubleshooting and Circuit Diagram

5-12. GSM Transmitter

GSM TX 5pcl
N
U1006
9 pin : 33 dBm?
N
U1006
2, 8 pin:High?
4, 10 pin:Low?
Y
OSC903
3 pin:0.8 V~2.5 V?
N
1.7 V
1.25 V
17, 18, 19, 20 pin
0.8 V
R701, R702, R711,
R712 like left?
Change CN301
Y
N
Change
Y
U1006
U901
Change
Y
OSC903
like left?
N
Change
Y
Resister
SAMSUNG Proprietary-Contents may change without notice
U1005
N
2 pin:High?
Y
U1004 2pin:Low?
N
Y
U1004
N
3pin:Low?
Y
Change U1008
5-12
Change U1005
Change
U703 5pin:Low?
N
3pin:Low?
Y
Change U1004
Change U1004
U703