LG GU280 Service Manual page 41

4. TROUBLE SHOOTING
4.3.2 Checking Front-End Module Block
LGE Internal Use Only
Checking Flow
Check TP3 of SW101
with RF Cable
TP2 Signal
same as TP7?
Yes
Check TP1
=2.85V?
Yes
End
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No
Replace SW101
No
Check U201
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