Samsung GT-B5510 Service Manual page 56

8-4-1. GSM850 RX
**If you check the tx chain,
Check the not only RF Device but also resistor, inductor and capacitor.
Resolder U100 or Change
Continuous Rx ON
RF Input : 190 CH
Amplitude : -50dBm
Yes
Normal condition
Catch the channel?
Yes
Check C118
>= -55dBm ?
Yes
Yes
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No
Check Antenna contact
No
Replace U100
8-27
Level 3 Repair