LG 34UC88 Service Manual page 13

3. No Video – HDMI
Check input signal format
Is it supported?
Y
Check HDMI Cable for
Damage or Open Connector
Y
Check JK100(JK101) for
proper connection or
Damage
Y
Check I2C Signal(EDID)
Y
Replace Main Scaler
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Only for training and service purposes
N
Replace Connector
N
Re Download EDID Data
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LGE Internal Use Only