Read LG 42CL11-UA (CHASSIS:LA92A) Service Manual online
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4. Component Video
Check Component Cable.
Check JK1200.
OK
Check input signal format.
Is it supported?
OK
Replace Jack.
No
OK
Check Mstar LVDS output
Replace Mstar(IC100) or Main board.
No
5. RGB Video
Check RGB Cable conductors for
damage.
Check JK1204.
OK
OK
Check input signal format.
Is it supported?
OK
Check signal R/G/B/H/V-Sync
C113, C108, C114, R146, R149
Replace Jack.
No
Check EDID.
OK
Replace the defective IC or re-download EDID data
No
Check other set.
If no problem, check signal line.
No
OK
Check Mstar LVDS output
Replace Mstar(IC100) or Main board.
No
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