I already confirmed this 9 months ago.
Someone else also did it months ago
Pn59d7000 with the d8000 main board.
No service mode or anything nessisary. Plug and play. The tv will think it's an 8000 with web browser and everything.
I haven't had a single problem. I highly recommend never updating the firmware. Not because I think it won't work, but because almost all the trouble I read on these tvs are due to Samsung pushing bad updates.
I'm actually about to sell the tv for 400 and make 8x my money on it. It's a shame to let it go but I need to focus on school and having a tv is too much of a distraction.
Last edited by Pip313; 06-05-2016 at 09:24 PM.