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SGH-X100 Flow Chart of Troubleshooting
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7-
16
11. GSM Receiver
U100 Pin5
>= -65dBm
Resolder CN100, C108
END
No
Yes
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Check U100
pin8 = L, pin4 = L
U100 pin7
>= -65dBm
F101 pin1
>= -70dBm
U103 pin6, 7, 8, 9
>= 1V
U103
pin32 >= -70dBm
pin33 >= -70dBm
Check ANT Switch
control circuit
Resoder U100
Resolder F101, C110, L108
Resolder L105, L106, L107
Check U103
pin4, 10, 22 >=2.7V
?
Resolder U103
R135, R136, R137,
R138 >= 1V
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Check U200