LG LMV1762SB, Service Manual

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1 Do only the START key and
EZ-ON keys operate?
(Door should be closed.)
Do the keys operate?
No
Yes
No
2 Is there a beeping sound
in the continuity test between
the ends of the latch board?
- Secondary switch
(Door should be closed.)
Power ON
Yes
No Adjust latch
board
(Refer to section
9-1,9-2)
Check PWB
Go to No. 4 of
this flow chart.
3 When the door is opened,
is the voltage of the door
sensing part over 4 V?
(CN3 Pin1 and Pin2)
Yes
No Replace the PCB
(EBR75341201)
Reconnect or
repair the
connector.
Replace the PCB.
(EBR75341201)
4 Is the connector connected
to the PCB disconnected or
disassembled?
No
Yes
Replace the keypad?
No