Read LG 42LN5400 (CHASSIS:LA32B) Service Manual online
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4. Component Video
Check input signal format.
Is it supported?
Check Component Cable
for damage or open conductor.
Check JK1702
Y/PB/PR signal Line
ok
ok
ok
No
Replace Jack
Check COMP_DET Signal
Replace R1712 or R1713
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
No
5. HDMI Video
Check input signal format.
Is it supported?
Check HDMI Cable conductors
for damage or open conductor.
Check EDID
R832, R833, R834, R835 I2C Signal
Check JK801, JK803
ok
ok
ok
No
No
Replace the defective IC or re-download EDID data
ok
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
Replace R803, R801, R826, R807, R817, Q801, R819, R818, R830
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