LG LFX28978 series Service Manual page 33

8-9 Communication Error (Er CO)
No
1 Check the loose connection.
2 Check the Red to White/Red.
CON101
<Display>
3 Check the Orange to White/Red.
CON101
<Display>
4 Check the White/Black to White/Red.
CON101
<Display>
5 Check the White/Red to Orange.
6 Check the White/Red to White/Black.
Checking flow
<CON101>
<CON101>
<CON101>
<CON5>
<CON5>
Result & SVC Action
Result
12 V
Other
Result
0 V or 5 V
Other
Result
0 V or 5 V
Other
Result
0 V or 5 V
Other
Result
0 V or 5 V
Other
- 33 -
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