LG G3100 Service Manual page 56

4. TROUBLE SHOOTING
4.2.1 Checking Regulator Circuit
U404.1 U404.6
Check Pin 6
No
Pin 6 High? Change the board
Check Pin 1. RF 2.85V OK?
No
Yes Yes
Regulator Circuit is OK Replace U404
See next page to check
VCTCXO
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