Originally Posted by TheXev
10%, that's a weird number... if your phone is still under warranty and you haven't debranded it, I'd send it back to HTC to see if they can fix it... just try to flash a rom and hope that you can get a stock SPL flashed to it..
I would still attempt a GoldCard flashing if you have the ability to try it.
I had a similar problem with my friend's HD7. Tried the GoldCard approach - no luck with that. Tried official HTC service but they could't help either. If your warranty isn't void you should definitly send it back - if they can't fix it you get a new phone
If you really want to try replacing the motherboard I think your best best is to look for "broken" Trophies on eBay. Hope you'll have more luck than I had...