LG 42LV4400 Service Manual page 70

TROUBLE OF DDC READING
Start
Analog DDC OK?
Yes
HDMIDDC OK?
END
–
CONFIDENTIAL DO NOT COPY
Yes
N0
N0
Yes
Support DDC1/2B
1. VGA cable ok?
2. Check signal (U22 to P5)
3. Check U22 Voltage
4. Is compliant protocol?
Support DDC1/2B
1. HDMI cable ok?
2. Check signal (U31 to P7)
3. Check signal (U30 to P8)
4. Check signal (U32 to P10)
5. Is compliant protocol?
Page 9-6
File No. SG-0000034