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Flow Chart of Troubleshooting
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7-
19
12. GSM Receiver
U103 Pin7
>= -65dBm
Resolder CN100, C144
END
No
Yes
RX ON
RF input : CH center freq
Amp : -50dBm
Check U103
pin4 = L, pin8 = L
U103 pin5
>= -65dBm
F100 pin1
>= -70dBm
U100 pin6, 7, 8, 9
>= 1V
U100
pin32 >= -70dBm
pin33 >= -70dBm
Check ANT Switch
control circuit
Resolder U103
Resolder F100, C104, L103
Resolder L100, L101, L102
Check U100
pin10,22,28 >=2.7V
pin20 >=4.0V
Check & Resolder
RF PSU Part
Check &Resolder
U100, RF26MHz part,
R100, R101
R116, R117, R119
R121 >= 1V
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Check U200