LG LRMVS3006 Series Service Manual page 56

Communication Error (E CO)
1
Check the loose connection
2
Check the voltage.
Is CON101 5th Pin ~ 4th Pin
voltage 12V?
CON101
5th pin & 4th pin
CON101
Yes
3
Check the voltage.
Is CON101 1st Pin ~ 4th Pin
voltage 5V?
CON101
CON101
1st pin & 4th pin
No
4
Check the voltage.
Is CON101
CON101 2nd Pin ~ 4th Pin
voltage 0V or 5V?
CON101
CON101
2nd pin & 4th pin
No
5
Check the voltage.
Is CON101 3rd Pin ~ 4th Pin
voltage 0V or 5V?
Check the
No
Hinge (loose
connection)
Change the
6
Main PCB
Check the voltage.
Is CON5 12th Pin ~ 11th Pin
Voltage
voltage 0V or 5V?
[V]
12V
Check the
Yes
Hinge (loose
connection)
7
Change the
Main PCB
Check the voltage.
Is CON5 14th Pin ~ 11th Pin
voltage 0V or 5V?
Voltage
[V]
5V
Change the 7
Yes
Display PCB
Explain to customer
Voltage
[V]
Not
0V, 5V
-54-
Yes
CON101
CON101
3rd pin & 4th pin
No
Yes
CON5
12th pin & 11th pin
No
Yes
CON5
14th pin & 11th pin
No
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Change the
Main PCB
Voltage
[V]
Not
0V, 5V
Change the
Display PCB
Voltage
[V]
Not
0V, 5V
Change the
Main PCB
Voltage
[V]
Not
0V, 5V