Answering my own dumb questions... and kinda turning this into a repair thread...
1) Yes, the LOPT has died.
RetroManCave did a repair video here -- https://www.youtube.com/watch?v=4pupJ_a73ro
And Jan Beta here -- https://www.youtube.com/watch?v=LgtNkfX4Rss
And here's one from Jani Potrc with just the sound of the fault -- https://www.youtube.com/watch?v=Ee6OHpsFPfo
2) Yes that's the right flyback. Expand the comments for the Jani Potrc video and it's mentioned in one of the threads.
HR Diemen part number HR7533, sold by Donberg Electronics.
There's an old post from the CSA groups which says the AKF17 is "significantly different" to the CM8833-II and uses a different flyback. I won't link to it because it's complete and utter FUD.
3) The correct switch is SW28 from Donberg, but you'll need to transfer the metal bracket from the old switch.
The CM8833-II (aka CM11342, CM11362) Service Manual is online: https://www.manualslib.com/manual/15560 ... 11342.html
The AKF17 fits into the model lineup as a sort-of hybrid between the CM11342 and CM11362. Essentially it's a CM11362 with stereo audio - or a CM11342 without PAL CVBS or Y/C input.
The test pattern generator needed is probably the PM5519, so the manual of that is good as a translation from "Philips service manual" to "whatever this other pattern generator I have calls that pattern": http://bee.mif.pg.gda.pl/ciasteczkowypo ... pm5519.pdf
Adjustment of G2 (Screen) and Focus are on page 6 of the service manual. If you cross your fingers and hope that the cutoff controls on the neckboard are correct, then it boils down to:
- Set Screen (G2) to minimum.
- Set front panel brightness to one-quarter and contrast to minimum.
- Apply a white crosshatch image to the RGB input (a solid black screen or "Supervisor" prompt might also work!)
- Adjust G2 until the black background just starts to brighten, then turn it back down until it just cuts off.
- If one or more colours cut in before the others, you need to trim the RGB cutoff. Sorry, full page 6 process it is
Recapping -- the commentary on Jan Beta's video is good. The description includes a list of electrolytics you'll need to replace. There's a non-polarised electrolytic in there too, I'd be inclined to leave it alone. The comments include a few suggestions for replacements.
I'm waiting to hear back from suppliers about parts availability. More updates "soon"!