LG LSSB2791ST Service Manual page 43

TROUBLESHOOTING
2. Troubleshooting With Error Display
12) Communication Error(Er CO)_TOP DISPLAY
No
1
Check the loose connection.
Check the White&Black to Orange.
2
Check the Orange to Brown .
3
Check the Orange to Red .
4
Check the Pin19 to Pin20 of CON7.
5
6
Check the Pin18 to Pin19 of CON7.
Checking flow Result & SVC Action
Result
12V
Other
Result
0V or 5V
Other
Result
0V or 5V
Other
Result
0V or 5V
Other
Result
0V or 5V
Other
43
SVC Action
Go to the 3
Check the Hinge
(loose connection)
Change the Main PCB
SVC Action
Change the Display PCB
Go to the 4
SVC Action
Change the Main PCB
Go to the 5
SVC Action
Change the Display PCB
Go to the 6
SVC Action
Change the Main PCB
Explain to customer