LG LFX28968D Service Manual page 43

Communication Error (E CO)
1
Check the loose connection
2
Check the voltage.
th th
Is CON101 5 pin ~ 6
voltage 12V?
Voltage
Housing
CON101
12V
th th
5 pin ~ 6 pin
Yes
3
Check the voltage.
th th
Is CON101 4 pin ~ 5
voltage 0V or 5V?
Voltage
Housing
CON101
th th
4 pin ~ 5 pin 0V, 5V
No
Check the
No
Hinge (loose
connection)
pin
Change the
Main PCB
[V]
Change the
Yes
Display PCB
pin
[V]
Not
4
Check the voltage.
th rd
Is CON101 5 pin ~ 3
voltage 0V or 5V?
Voltage
Housing
CON101
th rd
5 pin ~ 3 pin 0V, 5V
No
5
Check the voltage.
th th
Is CON5 4 pin ~ 6 pin
voltage 0V or 5V?
CON5
No
6
Check the voltage.
th th
Is CON5 4 pin ~ 8 pin
voltage 0V or 5V?
CON5
No
7
Explain to customer
Change the
Yes
Main PCB
pin
[V]
Not
Change the
Yes
Display PCB
Voltage
Housing
[V]
CON5 Not
th th
4 pin ~ 6 pin 0V, 5V
Change the
Yes
Main PCB
Voltage
Housing
[V]
CON5 Not
th th
4 pin ~ 8 pin 0V, 5V