Read LG 42SL8000-ZB / 42SL8500-ZA (CHASSIS:LD91K) Service Manual online
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31. Remote Control Problem
Check IR B’D P100 Wafer
& Connector
Check MAIN B’ D P1304
Wafer & Connector
YES
YES
Replace IR B’D
IR B’D IC101 Pin #1, 3
Voltage 4V
- ?
YES
NO
Replace it
NO
Replace IR B’D IC101
NO
Replace MAIN B’D IC100
32. Intelligent Sensor Problem
Check IR B’D P100 Wafer
& Connector
Check MAIN B’D P1304
Wafer & Connector
YES
YES
Check IR B’D IC100
Pin #6 3.3V ?
NO
Replace it
YES
Replace IR B’D IC100
33. Intelligent Sensor Problem
Check IR B’D P100 Wafer
& Connector
Check MAIN B’D P1304
Wafer & Connector
YES
NO
Replace IR B’ D
YES
NO
Replace it
NO
Replace Soft-touch ass’y
Check IR B’D P101 Pin #4
Voltage 5V ?
NO
Replace IR B’D P101
AND Check 5V?
NO
Replace IR B’ D
YES
Check Soft-touch B/D
J2 Pin #6,7 KEY LEVEL
(TABLE A)
NO
Replace Soft-touch ass’y
2.25V
Ch+
1.6V
Ch-
0.85V
Vol+
0.2V
Vol-
2.25V
Enter
1.6V
Menu
0.85V
Input
0.2V
Power
TABLE A
Replace Soft-touch+ Middle bottom ass’y
And check the sensitivity
Of In-start menu
And check the sensitivity
Of In-start menu
Check Soft-touch B/D
J2 Pin #1.2 SCL,SDA
YES
YES
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