LG HB620 Service Manual page 117

4. TROUBLE SHOOTING
Set the Phone Rx is ON
Check Vbias over 2V?
LGE Internal Use Only
YES
Check TP1
Signal exist?
YES
Check TP2
Signal exist?
YES
Check TP3
Signal exist?
YES
Check TP4
Signal exist?
YES
Rx is OK
Check other Parts
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NO
Check bias
Block soldering
NO
Check the RF S/W
NO
Check FEM
FL101
NO
Check the Duplexer
FL104
NO
Check the RTR 6275
U101
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