Undoing four screws on the sides of the scope let me slide the top cover off to reveal the innards.
The top circuit board looks to be the power supply board, and probably a few other things. Undoing a bunch of screws holding the top board down and a bit of fiddling around (discovered the board is on a hinge) let me lift it up to reveal more of the scope’s innards.
Three screws hold the cover of the power supply section.
A few dust bunnies inside, but overall everything looked to be in fairly decent condition (aside from not working).
First look around the inside didn’t reveal anything obviously wrong. No blown caps or scorched areas. Whether this is something I’ll be able to repair or not is still up in the air. This scope is probably going to be spending a while on the bench.
I was using it to look at the output of one of my EtherkitSi5351 breakout boards when it made a high pitched “pffft”, the waveform disappeared and a bunch of indicator lights came on.
Haven’t opened it up yet to see if I can spot anything wrong. The scope still turns on, but there’s no display. The indicator lights behave like the scope is working, but there’s nothing on the CRT. That could be a good sign.
Will be a while before I have some time to poke around the innards of the scope.