27LS5400, 27LS540T (CHASSIS:LD02M) - LG TV Service Manual (repair manual). Page 20

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