Samsung SGH-E390 - GSM850 Receiver

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Flow Chart of Troubleshooting
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9-29
9-18. GSM850 Receiver
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Yes
F100 Pin10
>= -65dBm
No
Resolder RFS100,C101,L100
Yes
Check ANT Switch
control circuit
F100 pin3,4
>= -68dBm
Check F100
pin14,pin13 = L
NoNo
Resolder F100
Yes
Yes
No
U102
pin 27 >= -74dBm
pin 28 >= -74dBm
Yes
No
Resolder L107,L109, L110
U102 pin 1,2,3,4
>= 1V
Yes
No
Check U102 pin
5,8,19,,31,35,39
>=2.7V
Check & Resolder
U102,
C129,R103,R104,C123,
C127,C134,C135
RF26MHz, RF PSU Part
Yes
Resolder U102
Check UCP200
END