Samsung i640 Service Manual page 85

9-12. PCS Receiver
RX ON
Sector Power = -50dBm
U100 pin11
>=-60dBm
U100 pin21,22
>=-70 dBm
U101 pin36,37
>=-75 dBm
Check U101 & UCP200
END
Resolder RFS100,
No
C104,L100,R100,
Yes
No
Yes
No
Resolder or Change
L105,L106,L107,C134
Yes
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C105
No
Check
U100 truth
table
Yes
9-41
Flow Chart of Troubleshooting
Pin#6: Low
Pin#5: High
Pin#4: High
Check
R106,R109,
R118,UCP200
Resolder or
Change U100