LG 42LN541C Service Manual page 16

4. RGB Video
Check input signal format.
Is it supported?
ok
Check RGB Cable
for damage or open conductor.
ok
Check JK705
R/G/B signal Line
ok
Check RGB_DET Signal
ok
Check Mstar LVDS Output
5. HDMI Video
Check input signal format.
Is it supported?
ok
Check HDMI Cable conductors
for damage or open conductor.
ok
Check EDID Downlaod
ok
Check JK801, JK802,JK803
ok
Check HDMI I2C Signal
ok
Check HDMI_DET (HPD)
ok
Check HDMI Signal
ok
Check Mstar LVDS Output
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No
Replace Jack
No
Replace R1732
No
Replace Mstar(IC101) or Main Board.
No
Replace the defective IC or re-download EDID data
No
Replace Jack
No
Replace D801. D802
Replace HDMI1 R802, R805, Q801
No
HDMI2 R804, R805, Q802
HDMI3 R815, R817, Q804
No
Check other set
If no problem, check signal line
No
Replace Mstar(IC101) or Main Board.
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No
Replace Main Board
LGE Internal Use Only