LG SJ2 - Key Part

3-7
ELECTRICAL TROUBLESHOOTING GUIDE
2. KEY PART
YES
YES
YES
YES
YES
NO
NO
Key part
OK
Replace the cables.
Replace the related part.
Check R428 Pull-up resistors.
OK
NO
NO
Check CN800 pin3, 4 voltage.
Check TA800, TA801, TA802, TA803.
Check the connecting cables.
Check R800, R801, R802, R803.