Samsung GT-i8910 Service Manual page 78

9-2-3. Abnormal WCDMA900 Tx Operation
TX ON
PWR=23dBm
Target
1. Check
FEM Ant
F100 PIN20
≥ 10dBm
2. Check
FEM In/Out
F100 PIN17
≥ 8dBm
3. Check
Duplexer Ant
DUF101 PIN6
≥ 5dBm
4. Check
Coupler Input
CPL101 PIN1
≥ 5dBm
5. Check
PAM Output
PAM101 PIN13
≥ -15dBm
6. Check
Transceiver Input
RFT100 PIN57
≥ -20dBm
Check RFT100,
UCP300
END
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
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Resolder RFS100,
L103, C101
Check F100
PIN15=H, PIN14=H
PIN13=H, PIN12=L
YES
Resolder
C176, L123
Resolder or change
CPL101, R118, R112,
R114, R115
Resolder or Change
L137, C107, L138, C187
Resolder or Change
PAM101, F103, C179,
C180, C120
9-41
Flow Chart of Troubleshooting
Check Antenna
Switch Control
NO
Resolder or Change
F100