Samsung SGH-E250D W Service Manual page 45

Flow Chart of Troubleshooting
9-12. GSM Receiver
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Yes
F100 Pin13
>= -65dBm
Yes
F100 1,2
>= -68dBm
Yes
U106
pin 24 >= -70dBm
pin 25 >= -70dBm
Yes
U106 pin 4,5,6,7
>= 0.2Vp-p
Yes
Check UCP200
END
No
Resolder CN101, C103, L102
No
No
Resolder C108, C109, L105
No
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Check F100
pin9,pin11 = L
Yes
U106 pin 16,17,29
32,36>=2.8V
Yes
9-20
No
Check ANT Switch
control circuit
Resolder F100
No
Check & Resolder
C117,C123,C126
RF26MHz, RF PSU Part
Resolder U106