Samsung GT-i8910 Service Manual page 99

Flow Chart of Troubleshooting
9-2-9. Abnormal GSM850/EGSM Tx Operation
TX ON(5 level)
1. Check
FEM Ant
F100 PIN20
≥ -5dBm
2. Check
FEM input
F100 PIN24
≥ -15dBm
3. Check
PAM output
PAM100 PIN8
≥ -15dBm
4. Check
Transceiver output
RFT100 PIN55
≥ -15dBm
Check RFT100,
UCP300
END
YES
NO
YES
NO
YES
NO
YES
NO
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Resolder RFS100,
L103, C101
Check F100
PIN15=H, PIN14=H
PIN13=L, PIN12=L
YES
Resolder
C123
Resolder PAM100,
C126, R103,
R104, R105
PIN12
PIN13
PIN14
PIN15
9-62
Check Antenna
Switch Control
Resolder or Change
F100