Read LG 22LN45XX / 22LN450U / 22LN457U (CHASSIS:LC31A / LD31T) Service Manual online
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6. No Video - HDMI
Check input signal format
Is it supported?
Y
Check JK500,501
for proper connection or damage
Replace connector
Y
N
Y
Check HDMI Cable for damage
or open connector
Check I2C Signal (JK500,501)
(#15, #16)
Re download EDID data
Y
N
Check HDCP Key (IC101)
Replace Scaler(IC101)
N
7. No Audio
Make sure you can’t hear any audio and
Device support the audio signal normally.
Check Speaker and
its wire connection (P700)
and the resistance
Check Signal from IC700
L700,L701, L706, L709
Y
Replace IC700
N
Check R4045 Voltage Level (3.3V)
Y
Replace IC807(3.3V)
N
Y
Check Signal from IC101
SDA/SCL
(R703/R214, R707/R213)
Y
Replace IC101
N
Replace connector or Speaker
N
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