LG LMHM2017SW Service Manual page 16

5 Is there any beep sound in
continuity test between the
ends of the Fuse?
Yes
6 Is there any beep sound in
continuity test between the
ends of noise filter?
Neutral terminal of
Noise filter
Yes
Replace the
No
Fuse.
Reconnect or
No
repair the
connector.
Live terminal of
Noise filter
-16-
7 Is the connector connected
to Main PCB assemble
disconnected or
disassembled? (CN10)
No
Power ON
8
Is the voltage of Main PCB
out of the range?
Normal condition
Pin 1 to Pin 4 of CN10_20V
Yes
9
Replace the Door
PCB(EBR64419501).
Reconnect or
Yes
repair the
connector.
Replace the
No
Main PCB
(EBR64419604)