1stly, u'll need to get it completely apart.

then i would suggest laying the board alone and then all the other bits on a radiator for a few days.

if that doesnt fix it, and i presume the pics/voice u have on there are stored on the mainboard, its gonna be very costly to get the data off it.

hopefully, the above will work to the extent u can get the data off, failing that, look on ebay and get a faulty one for spares, and try and amalgamate the 2 to get ur one working.l

sorry cant be much more help