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Flow Chart of Troubleshooting
7-
22
7-13. GSM Receiver
U201 Pin1
>= -65dBm
Resolder CN201, C209
END
No
Yes
RX ON
RF input : CH center freq
Amp : -50dBm
Check U201
pin3=L,pin5=L,pin2=L
U201 pin12,13
>= -65dBm
U100
pin32 >= -70dBm
pin33 >= -70dBm
U100 pin6, 7, 8, 9
>= 1V
Check ANT Switch
control circuit
Resolder U201
Resolder C101, C102, L100
Check U100
pin10,22,28 >=2.7V
pin20 >=4.0V
Check & Resolder
RF PMU Part
Check &Resolder
U100, RF26MHz part,
R100, R101
R110,R113,R114,
R115 >= 1V
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
Check U300