Read LG 42CL11-UA (CHASSIS:LA92A) Service Manual online
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6. AV Video
Check AV Cable for damage or open conductor.
Check JK1200(*JK1202).
OK
Check input signal format.
Is it supported?
OK
Replace Jack.
*JK1202 is Side AV supported model
32/37/42/47LH30 Models
No
OK
Check Mstar LVDS output
Replace Mstar(IC100) or Main board.
No
Check HDMI Cable conductors for
damage of open conductor.
Check JK500, 501, 502
OK
OK
Check input signal format.
Is it supported?
OK
Check EDID & EEPROM
IC500, 501, 502.
I2C Signal
Replace Jack.
No
Replace the defective IC or re-download
EDID data.
No
Check HDCP key NVRAM(IC105)
power & I2C Signal (#5, #6)
Replace the defective IC.
No
OK
Check HDMI Signal
Check other set.
If no problem, check signal line.
No
Replace Main board.
No
OK
7. HDMI Video
OK
Check Mstar LVDS output
Replace Mstar(IC100) or Main board.
No
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