Samsung i780 Service Manual page 79

Flow Chart of Troubleshooting
9-10. GSM Receiver
RX ON
Sector PWR = -50dBm
YES
F100 pin 11 >=
- 60 dBm
YES
F100 pin 23,24 >=
- 70 dBm
YES
U100 pin 32,33 >=
- 75 dBm
YES
Check U100,& UCP200
NO
NO
NO
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Resolder RFS100,
L100, L101, C103, C109
NO
Check F100 truth
table
Pin 4,5,6, : LOW
YES
Resolder or Change
L110, L111, L109
9-32
Check R103, R105,
R109, UCP200
Resolder or Change
F100