Read LG 42LH90QD (CHASSIS:LT91C) Service Manual online
Check Signal format
Is it supported?
Check the HDMI Cable
YES
YES
Replace MAIN B’D IC 100
MAIN B’D JACK Check
JK600 -> HDMI1
JK601 -> HDMI2
JK602 -> HDMI3
JK603 -> HDMI4
JK601 -> HDMI2
JK602 -> HDMI3
JK603 -> HDMI4
YES
Making
Revision
2009. 2 . 1
12/25
LCD TV
Symptom
HDMI1 or 2 or 3 or 4 No Video
Problem
Problem
Check MAIN B’D IC600
YES
25
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