LG LSWS306ST Service Manual page 50

Power Failed (Dead),
No display?
Plug in 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?
Yes
3
Check the connection of
Main PCB.(CN01)
Normal?
Yes
TROUBLESHOOTING
Replace the
Yes
Main PCB
Reconnect. If
defective harness,
No
replace or fix
Reconnect. If
defective harness,
No
replace or fix
4
Check the AC input of Main
PCB.
- Main PCB CN01
(Pin 1 and 3)
120V AC?
Yes
5
Check the connection of
L1 and N at Terminal block.
Normal?
No
6
Check the Thermostat
- Normal : Short
- Abnormal : Open
Normal?
Yes
Replace the
Main PCB
7-4
Replace the
No
Main PCB
Yes
Reconnect.
Replace the
No
Thermostat