Samsung SGH-G810 Servise Manual page 61

10-8. EGSM RX
RX ON
AMP--50dBm
FEM100 PIN8
≥ -60dBm
NO
FEM100 PIN4
≥ -70dBm
NO
U100 PIN3,4
≥ -75dBm
NO
U100 PIN48,
49 ≥ -75dBm
NO
Check U100, UCP300
END
YES
Re-solder RFS100,
L102, C119
YES
PIN28=H, PIN27=L
YES
Re-solder or Change
F103,C119,C187
Re-solder or Change
YES
L111,L112,L113, L114
PIN28
PIN27
PIN1
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Check FEM100
PIN1=H
YES
10-47
Flow Chart of Troubleshooting
Check Antenna
Switch Control
Re-solder or Change
FEM100