I had heard many reports of the drum sets that came with world tour being defective. One guy I know can't get long streaks because the drum set just wasn't of high enough quality. When I set up my drum set it worked great! I was relieved. It seemed the build quality had improved. Not so fast.... Within a few days of some serious rocking out the yellow cymbal failed altogether. I was livid. I knew the stores wouldn't take it back, and it would be weeks to get it shipped and fixed, at a cost. So I did what I do best... I voided the warranty.
I figured the cymbal was a pretty simple piezoelectric device, and anything wrong with it was an easy fix for a geek and his soldering iron. So I set to work. My cymbal was totally non-functional, and broken is a certain way, your mileage may vary.
Step 1: Acquire testing ability.
Credit goes to this other instructable
on drum set repair for the idea of using the mii freestyle as a test bed. You should start this up and leave it running. Whenever you need to test the cymbal, just plug it in, and see if it works. Very productive!