LG LFXS29766 Series Service Manual page 47

Communication Error (Er CO)
1
Check the loose connection
2
Check the voltage.
Is CON101 4 th pin & 6 th pin
voltage 12V?
CON101
CON101
4 th pin & 6
Yes
3
Check the voltage.
Is CON101 5 th pin &6 th pin
voltage 0V or 5V?
CON101
CON101
5 th pin & 6
No
Check the
No
Hinge (loose
connection)
Change the
Main PCB
Voltage
[V]
11.4~
12.6V
th pin
Change the
Yes
Display PCB
Voltage
[V]
Not
th pin 0V, 5V
- 47 -
4
Check the voltage.
Is CON101 4 th pin & 6 th pin
voltage 0V or 5V?
CON101
CON101
4 th pin & 6
No
5
Check the voltage.
Is CON5 4 th pin & 6 th pin
voltage 0V or 5V?
CON5
4 th
No
6
Check the voltage.
Is CON5 4 th pin & 8 th pin
voltage 0V or 5V?
CON5
4 th
No
7
Explain to customer
Change the
Yes
Main PCB
Voltage
[V]
Not
th pin 0V, 5V
Change the
Yes
Display PCB
Voltage
[V]
Not
pin & 6 th pin 0V, 5V
Change the
Yes
Main PCB
Voltage
[V]
Not
pin & 8 th pin 0V, 5V