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SGH-X600 Flow Chart of Troubleshooting
7-
2
12. GSM Receiver
U102 Pin10
>= -65dBm
Resolder CN101, C101
END
No
Yes
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Check U102
pin4 = L, pin7 = L
U102 pin8
>= -65dBm
F101 pin1
>= -70dBm
U103 pin 6, 7, 8, 9
>= 1V
U103
pin32 >= -70dBm
pin33 >= -70dBm
Check ANT Switch
control circuit
(Q100,Q101)
Resoder U102
Resolder F101, C106, L106
Resolder L102, L103, L104
Check U103
pin4, 10, 22>=2.7V
Check & Resolder
R103,R104,C122,C125
OSC101, RF PSU Part
Resolder U103
R134, R135, R136,
R137 >= 1V
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Check U200