I was also pretty sure there were service manuals for the (then) new BV10s back in 2011/12, but it seems to be impossible to find them here or elsewhere.
I have also failed to open the back cover and just asked the same question here.
Have you succeeded to open the damn thing up in the meantime since march?
I am quite desperate, as this giant lump of a TV has to go if it is beyond repair.
Kind regards, Phil