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42LD450 (CHASSIS:LT01B) - LG TV Service Manual (repair manual). Page 53

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7. HDMI Video
Check input signal format.
Is it supported?
Check HDMI Cable conductors
for damage or open conductor.
Check EDID & EEPROM
IC801*, IC804**
I2C Signal
Check JK802, JK903
ok
ok
ok
No
No
Replace the defective IC or re-download EDID data
Check HDCP Key NVRAM(IC103)
Power & I2C Signal
Replace the defective IC.
ok
No
Replace Jack
Check HDMI Signal
Check other set
If no problem, check signal line
ok
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
No
Replace Main Board
No
Check HDMI_DET(HPD)
No
ok
Replace R802*,R804*,R830*,R896*,Q802*
Replace R835**,R837**,R862**,R897**,Q803**
* HDMI1
** HDMI2
* HDMI1
** HDMI2
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