LG LAB550H Service Manual page 56

ELECTRICAL TROUBLESHOOTING GUIDE
No 3.3V_HDMI
YES
Is the
VCC supplied to IC802
pin1?
YES
Is there
signal at IC802
pin3?
YES
Check IC802 and replace.
No 1V_HDMI
YES
Is the
VCC supplied to IC803
pin1?
YES
Check IC803 and replace.
No 12 VA, 12V_LOADER
YES
Is the
VCC supplied to IC154
pin7?
YES
Check IC154 and replace.
NO
NO
Check IC101 pin25 (P_CTRL2).
NO
Check 3.3V_HDMI.
NO
Check PVDD on SMPS board.
2-43
Check 3.3 VA.