Toshiba 50L7300A turns on then blue screen

[Woollyentity]

I have a second hand Toshiba 50L7300A which, when plugged in, turns on and displays the Red Toshiba logo, but then displays a bright blue screen.
I understand this may be a problem with the main board (32L4300 rev 1.02a) but I'm not sure, and they're very difficult to find now anyway.
I tried updating the firmware - the USB flashes a few times when plugged in, then nothing happens and the blue screen is still all I get.
I also have no remote for this TV.

Video of the problem:
imgur.com/a/wdqRLEI

If you've heard of anything similar please let me know what I can try.

Thanks

[nomoresonys]

Re: Toshiba 50L7300A turns on then blue screen

Upload the pictures here, make them clear straight on of each board and one of the whole back so we can see how they are all connected, hit the go advanced and follow for procedure.