Power Failed(Dead), No Display - LG LUTG4519SN Service Manual

Power Failed (Dead),
No display?
Plug the unit
1
Check the button beep.
Touch the Clear button,
Can hear the beep sound?
No
2
Check the connection of Power
Cord. Normal?
No
Check the connection of SMPS
3
PCB.(CN01)
Normal?
CN1
Yes
TROUBLESHOOTING GENERAL
Yes
Replace the Main PCB
Reconnect.
No
If defective harness,
replace or fix
Reconnect.
No
If defective harness,
replace or fix
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
6
Check the Thermostat
- Normal : Short
- Abnormal : Open Normal?
Yes
Replace the SMPS PCB
-8-4-
Yes Go to 7
(On the next Page)
No
Reconnect.
No
Replace the Thermostat