I thought I would share our experience because there's no mention of this issue on the web.
Our washing machine would not power on. It is a digital, three-year old, LG top loader. We unplugged and plugged it back in several times and sometimes that would work.
We removed the front 'pretty' button-picture panel (not really sure what to call it). It's sort of just glued on. We didn't take it off cause the knob would not allow for it. Honestly we had the whole damn thing apart.
The touch buttons all have this tiny metal strip on foam push button. The power buttons metal was worn off. The washing machine worked when the power button was pushed. So we just drilled a hole through the panel so we could push the button. You could probably fool around and try to replace the metal with foil, but we were just tired of messing with it.
So...yea, the touch sensitive part of the power button was worn off. Its not directly under the power button, its 1/2" to the side. If you can't detach the front panel, or don't want to, get a Dremel or something and carefully cut the power button out. Don't do this if you don't want to deface your machine.
This was our way to save from buying another machine, expensive parts that weren't needed or pay for repair service.