Samsung GT-i8910 Service Manual page 84

9-2-5. Abnormal WCDMA1900 Tx Operation
TX ON
PWR=23dBm
Target
1. Check
FEM Ant
F100 PIN20
≥ 10dBm
2. Check
FEM In/Out
F100 PIN16
≥ 8dBm
3. Check
Duplexer Ant
DUF100 PIN6
≥ 5dBm
4 .Check
Coupler Input
CPL100 PIN2
≥ 5dBm
5. Check
PAM Output
PAM102 PIN8
≥ -15dBm
6. Check
Transceiver Input
RFT100 PIN59
≥ -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,PIN13=H
PIN14=L,PIN12=L
YES
Resolder
C145,L136
Resolder or change
CPL100, R118, R112,
R114, R115
Resolder or Change
C153, C1105
Resolder or Change
PAM102, F101, L115,
C151,C115
9-47
Flow Chart of Troubleshooting
Check Antenna
Switch Control
NO
Resolder or Change
F100