Power Failed(Dead), No Display - LG LSE4617ST Service Manual

Power Failed (Dead),
No display?
Plug the unit
Check the button beep.
1
Touch the Clear button,
Can hear the beep
sound?
No
2
Check the connection of
Power Cord. Normal?
Yes
3
Check the connection of
SMPS PCB.(CN01)
Normal?
Yes
Yes
Change the
Main PCB
Reconnect.
No
If defective
harness,
replace or fix
Reconnect.
No
If defective
harness,
replace or fix
9-2
4
Check the AC input of SMPS
PCB.
- SMPS PCB CN01
(Pin 1 and 3)
120V AC?
No
5
Check the connection of
L1 and N at Terminal
block. Normal?
Yes
Check the Thermostat
6
- Normal : Short
- Abnormal : Open
Normal?
Yes
Replace the
SMPS PCB
Go to 7
Yes
(On the next
Page)
No
Reconnect.
No
Replace the
Thermostat