Samsung GT-i8910 Service Manual page 119

Flow Chart of Troubleshooting
9-2-13. Abnormal PCS Rx Operation
RX ON
AMP = -50dBm
1. Check
FEM Ant
F100 PIN20
≥ -65dBm
2. Check
FEM output
F100 PIN7,8
≥ -75dBm
3. Check
Transceiver input
RFT100 PIN46,47
≥ -75dBm
Check RFS100,
UCP300
END
YES
NO
YES
NO
YES
NO
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Resolder RFS100,
L103, C101
Check F100
PIN15=L, PIN14=H
PIN13=L, PIN12=L
YES
Resolder or Change
F100, C114,
C121, L109
PIN12
PIN13
PIN14
PIN15
9-82
Check Antenna
Switch Control
NO
Resolder or Change
F100