LG LMV1683ST Service Manual page 17

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
No
board
(Refer to 9-1,
9-2)
-17-
3 When the door is opened,
is the voltage of door
sensing part over 4 V?
(CN3 Pin1 and Pin2)
Yes
4 Is the connector connected
to PCB disconnected or
disassembled?
No
5
Replace the keypad?
No
6
Replace the PCB.
(EBR67471707)
No
Replace the PCB
(EBR67471707)
Reconnect or
Yes
repair the
connector.