Gsm Receiver - Samsung SGH-F250 Service Manual

Flow Chart of Troubleshooting

9-12. GSM Receiver

RX ON
Cell Power : -60dBm
Yes
MODULE100 Pin13≥
-65dBm
Yes
MODULE100 1,2
≥ -68dBm
Yes
U100
pin C7 ≥ -70dBm
pin B7 ≥ -70dBm
Yes
U100 pin
C2,B1,B2,A1
≥ 0.2Vp_p
Yes
Check UCP200
END
①
No
MODULE100,C102,L102
No
③
No
Resolder L110, L111, L112
No
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Resolder
Check MODULE100
pin9,pin11 = L
Yes
U100 pin
G4,F3,D6,C5,B3,A5,
F1 29,32,33,36 ≥
2.8V
pin C1 ≥2.9V
Yes
9-24
No
Check ANT Switch
control circuit
②
Resolder MODULE100
④
No
Check & Resolder
C115,C116,C117,C114
And PMU Part
⑤
Resolder U100