LG LRG4111ST Service Manual page 51

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?
No
3
Check the connection of
Main PCB.(CN01)
Normal?
Yes
TROUBLESHOOTING
Yes
Replace the
Main PCB
Reconnect. If
No defective
harness,
replace or fix
Reconnect.
No
If defective
harness,
replace or fix
8-4
4
Check the AC input of Main
PCB.
- Main PCB CN01(Pin 1 and 3)
120V AC?
No
5
Check the connection of L
and N at Terminal block.
Normal?
Yes
Replace the
Main PCB
Yes
Replace the
Main PCB
No
Reconnect.