I just bought an Xbox with a melted grill on ebay
Only reason I bought it was because I was curious as to what caused it to melt(and I got it cheap) and got to looking and found these on youtube
and I've seen them before and wondered if they were fake.
Here is the link to the ebay purchase if you would like to see the melted grill you can see it best in the 2nd pic.
I thought about things it could be but the way the internal casing is designed I think the melting is external and not caused internally. I asked the guy if he knew any history as far as did it go up in flames or did someone perhaps lay the board on top of the case and try to do a reflow with a hot air gun but he doesn't know, says he bought it to repair himself but didn't have time to fool with it. He also said the board inside looks fine, not blown, nothing looks burnt so I'm so far thinking I may be right that someone laid a board on it and took a hot air gun to do a reflow or something.
I wound up getting it for $28 and free shipping so it will still be worth it for parts.
I just figured this would be a fun guessing game of what melted the case.
When it arrives I'll throw it on my bench and see what all I can find and get it going if possible and get back with results and pics.