LG WM2277HS

[AJ]

Can you tell me where to get the wiring diagram also?

Wiring diagram and troubleshooting guide can be found in the service manual.
Here is the service manual for your washer.

http://appliancejunk.com/forums/index.php?action=downloads;sa=view;down=17

[thescottfamily7]

I replaced the door latch assembly.  It is still clicking then gives me an error code of DE.

[wildimaginations]

It is possible that the new latch may be defective. 

The only other possible problem is the control board is not working properly.  Unplug the unit to reset the control board for about 2 minutes.  If it still doesn't sense the door lock, replace the control board.

[thescottfamily7]

I already replaced the control board

[wildimaginations]

If the latch and control board has been replaced, then check for continuity on the wire harness from the door latch to the control board.