NEC Multisync M500 (JC-1572VMA-1) Monitor

[TinnedTrace]

2 days ago got a NEC Multisync M500 (JC-1572VMA-1). Bought and picked it up without testing (though for 10 euro it's a risk I'm willing to take), but it doesn't work properly. Power LED on, it recognizes a signal (without one it drops to standby), the degauss thunk fires, the relay sounds normal, and there's a faint orange glow at the tube neck. There's no static feeling on the screen and no raster. Checking voltages on the flyback (4710-5705 / HFT2009) one pin spikes to 15V only to drop again on power up and everything else on the flyback stays low.
There are also no obvious blow/leaky caps though it's hard to properly check on close as it's now been a day and I still can't figure out how the board is held in the case, I removed all screws and can't find any latches.

Anyone any idea what it could be? Or if someone has a service manual (or a non-destructive way to get the main board out, as for the life of me can't figure that out) it would be greatly appreciated.

Here are some possibly helpful images:
https://imgur.com/a/2grwJEl

Edit:

Found a way to open it, it was held by 2 tabs that seem to require almost breaking the case to get loose.

Some pictures of the component sides of the boards:
https://imgur.com/a/gVNjPF8

[Username1]

.

Good Morning-

You will have to get a service manual to this thing and begin looking at the power supply
circuits most likely you have a bad capacitor somewhere. The NEC manuals
have strange diagnostic steps and not very informative snipits of how
it all works. I have a 15" NEC Multisync that also needs work that I
need to work on this winter.


.

[kf4rca]

I assume you're in Europe. What mains are you using? What mains does it require?

[kf4rca]

A while ago I ran into the same problem with a Dell (Sony) monitor. All the regular checks checked out. It was less than2 years old so the caps were probably still OK. I talked the CE into ordering the service manual ($20). So I'm zero-ing in on the problem area and suddenly I see it. An SMT transistor was hanging by just one lead. Resoldering the transistor fixed it. The secretary was happy to get her monitor back.
Those multisync monitors are really nice. They lock to the oddball scan rates that multimode monitors will not lock too. Sun Microsystems and Silicon Graphics computers both use oddball scan rates. Those are Linux computers. We had Silicon Graphics computers in the Weather department.
Remember this: if it worked before, it can work again!