Lg wm makes loud noise when changing speeds, grinding sound

SOURCE: lg tromm wm2277hw code de

Error Code "de" is for "door switch assembly faulty".
You can down load the service manual from this site:
http://136.166.4.200/contents/Laundry/WM2277.htm

Have fun!

SOURCE: VERY LOUD GRINDING NOISE LG WM-2277HW Front Load Washer

Get a new washer. Perhaps another brand.

The fix for me was to get a new washer. Had same issue with loud spin cycle. Tried researching while wife was continuing use of washer. Then the LE message appeared.

Took back apart and found that water had leaked and caused a boat load of damage. Bearings shot, seal leaks, drum leaks, Stator damaged. Same issue as 'jammy64' stated.

Cost to repair wasn't worth it. Going to get an
Electrolux model.

SOURCE: LG WM0642H front load washer making a loud vibration-type noise

mc not level

SOURCE: Grinding noise from the drum motor

ACTUALLY HAVING THE SAME PROBLEM.
SOUNDS A LITTLE LIKE BROKEN BEARINGS but I knwo it is not that serious. Seems like lint build up in the rotation drum space between steel and rubber ring seal at front door.

SOURCE: LG Tromm wm 1814cw makes loud noise

You will need to remove the back cover plate of the machine and locate the large pulley at the end of the drum. Remove the belt, then the pulley and you should see a bearing housing. Some models require a bearing and housing replacement, while others can simply be repaired with a bearing replacement alone.
Go here, and find the nearest Dealer for your part.

http://www.1stsourceparts.com/contact_us/branch_info.asp

Or you can try ordering direct from LG. If you are as handy with tools as you say, this should be a fairly easy job.