LG 42LK450 Service Manual page 66

Trouble shooting guide
7. HDMI Video
Check input signal format.
Is it supported?
ok
Check HDMI Cable conductors
for damage or open conductor.
ok
Check EDID & EEPROM
IC801,IC802,IC804
I2C Signal
ok
Check JK801, JK802, JK803
ok
Check HDMI_DET(HPD)
ok
Check HDCP Key NVRAM(IC103)
Power & I2C Signal
ok
Check HDMI Signal
ok
Check Mstar LVDS Output
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Only for training and service purposes
No
Replace the defective IC or re-download EDID data
No
Replace Jack
No
Replace R830,R828,R862
No
Replace the defective IC.
No
Check other set
If no problem, check signal line
No
Replace Mstar(IC101) or Main Board.
No
Replace Main Board
LGE Internal Use Only