LG HW300Y Service Manual page 31

6. Trouble shooting - No video (HDMI)
Check input signal format.
Is it supported?
ok
Check HDMI Cable conductors
for damage or open conductor.
ok
Check EDID
ok
Check JK1401
ok
Check HDMI_DET(HPD)
R993, R1403
ok
Check HDMI Signal output
(Main) R993, 964, 999, 988, 930
ok
Replace BCM(IC10) or Main Board.
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Only for training and service purposes
No
Download EDID
No
Replace Jack1401
No
Replace R993, R1403
No Check resister R993, 964, 999, 988, 930
If no problem, check signal line
No
Replace IC10 or Main Board
LGE Internal Use Only