LG U310 Service Manual page 85

4. TROUBLE SHOOTING
Set the Phone Rx is ON
Check bias1
Over 2V ?
YES
Check TP1
Signal exist?
YES
Check TP2
Signal exist?
YES
Check TP3
Signal exist?
YES
Check TP4
Signal exist?
YES
Change the board
NO
Check bias block
soldering
NO
Check RF s/w
NO
Check FEM
NO
Check Duplexer
NO
Check RFR6250
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