LG FH6 - Page 43

3-24
ELECTRICAL TROUBLESHOOTING GUIDE
POWER SUPPLY ON MAIN BOARD
YES
YES
YES
YES
YES
YES
No 5 V (LED lighting)
No 5 V (MIC/ AUDIO)
Check 5.5 VA on SMPS board.
Check 5.5 VA on SMPS board.
Check IC307 and replace.
Check IC305 and replace.
Check IC501 pin174 (VFD_PWR_CTRL).
Check IC501 pin174 (VFD_PWR_CTRL).
NO
NO
NO
NO
Is the VCC supplied to IC307 pin3?
Is the VCC supplied to IC305 pin3?
Is there signal at IC307 pin2?
Is there signal at IC305 pin2?