LG LSSB2791ST Service Manual page 44

TROUBLESHOOTING
2. Troubleshooting With Error Display
13) Communication Error(Er CO)_DISPENSER 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 Pin15 to Pin12 of CON7.
5
6
Check the Pin14 to Pin15 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
44
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