LG U880 Service Manual page 85

4. TROUBLE SHOOTING
Set the Phon e 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
Chan ge th e board
- 86 -
NO
Check bias block
soldering
NO
Check RF s/ w
NO
Check FEM
NO
Check Du plexe r
NO
Check RF R6250