LG 22LS5400/540T Service Manual page 20

6. No Video - HDMI
Check input signal format
Is it supported?
Y
Check HDMI Cable for damage
or open connector
Y
Check JK600/JK601
for proper connection or damage
Y
Check I2C Signal (JK600/601)
(#15, #16)
Y
Check HDCP Key (IC101)
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Only for training and service purposes
N
Replace connector
N
Re download EDID data
N
Replace Scaler(IC101)
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LGE Internal Use Only