Read LG 50LN5420-TC (CHASSIS:LB36B) Service Manual online
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4. Component Video
5. HDMI 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
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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