When I moved here to China, I bought a 110-220 converter, but when I plugged it in the whole thing fried... Guess the converter had a failure - luckily I didn't plug it into the xbox.
I had the whole thing rebuilt by some Chinese guys. They cracked it (literally) open and started replacing components inside. It was quite amazing. Got it back a few days later, cost me like 20RMB which is less than 3 dollars and it works fine. Although it's not in the best shape anymore - one of the screws is missing, and the casing is kind of cracked a little bit.
This won't help you though as you're not in China - just felt like sharing this story.