Product review (5 stars): Yes, you CAN fix your washing machine yourself!
The motor in my LG TROMM front-loader stopped working one day - the tub would jerk and an uncomfortable grinding noise came from the back of the washer.  In a panic I was ready to go to the big-box and buy a new washer since I was getting ready for a trip, but I'm glad I held off because this part saved me big bucks that I didn't have to spend.

As for my washer, I can only assume that the noise was some kind of electrical arcing because after a little research I found that there are no moving parts in the motor - it's a stator motor that spins the tub with magnetic force.  This sensor detects the position of the magnet relative to the motor so it can power the right coils in the motor.  There are many web sites demonstrating how to replace it but it's a 15 minute DIY job with a basic socket set - basically take off the rear panel, remove the center bolt and cover, then take out the 8 bolts attaching the stator and a couple screws holding the wiring in place - slide off the stator, disconnect the quick connects and slide off the stator.  This part simply clips to the back of the stator.  Make sure the stator goes on in the same orientation that you took it off in.  Unplug before working!

Anyway, this $12 part did the trick and saved me the cost of a service call and more if they had tried to scare me into replacing the entire stator motor assembly (which I hear is their standard procedure).  Pays to DIY.