Are you sure it's the WSoD? While I have heard of some people getting it a year later, but its usually pretty rare for that to happen. Normally WSoD happens early on in the the life of the device, usually after 10 or so reboots. I've had a problem from time to time where my screen was just white, but it was in some locked up state and removing the battery fixed it.

If it is the WSoD at this point the 770 is old technology and I don't think I would go through the effort of fixing it, just not worth it.