LG LMV1813SW Service Manual page 18

Does the keys operate?
No
Power ON
1 Do not only START key and
EZ-ON key operate? Door
should be closed?
Yes
2 Is there beep sound in
continuity test between the
ends of latch board?
Secondary Switch (Door
should be closed)
Yes
Check PWB
No
Go to No.5 of
this flow chart.
Adjust latch
4
No
board (Refer to
9-1, 9-2)
-18-
3 When the door is opened, Is
the voltage of door sensing
part over 4V?
(Pin 1 to Pin 3 of CN4)
Yes
4
Is the connector connected
to MAIN PCB assembly
disconnected or
disassembled? (CN3)
No
5
Replace the PCB
(EBR64419603)
Replace the Keypad
if changing the PCB
Doesn't resolve the problem.
Replace the
No
PCB
(EBR64419603)
Reconnect or
repair
Yes
the connector.