Sanyo VCR 7200 bad power supply

[luRaichu]

Hi,
I have a Sanyo VCR 7200 that locks up when a Betamax tape is inserted.
https://www.youtube.com/watch?v=_IZMfejzyJg
I found these videos from The Betamax Man that show a unit with similar behavior. Capacitors, a transformer, and the STK7217 voltage regulator had all failed on the power supply.
https://www.youtube.com/watch?v=UyxD3rqAwvc
https://www.youtube.com/watch?v=vVeFcjUMFBk
https://www.youtube.com/watch?v=fPF9Uri1sEE
I've just tried replacing my STK7217 with one from eBay, seems to be an old stock part with no difference in plastic packaging from the original. It still isn't outputting 9 and 12 volts.
Here is a picture of the power supply schematic as taken from the service manual.

Here are voltages measured from the power supply under no load:

• V IN OK
• Reg. 9V & 12V missing
• Always 10V = 14V
• AC 2.7V OK
• Time Base = 20V
• Always -24V OK
• Always 5.8V OK
• Always +33 = 64V
• Always 9V = 15V
• Reg. 9V from IC5101 missing (as it's generated from reg. 12V)

So the only problems are that the STK7217 still isn't working (perhaps DOA?) and Always +33 is 64V? Not sure why it is double. I pulled C5105 and it tested good.
Will check the PW2 board for problems but if the "new" STK7217 is really DOA I'll just have to try and design a replacement for PW2 with modern power regulators.

[luRaichu]

Was trying to find how the POWER UP signal worked when my probe slipped and shorted POWER UP with V IN (+28V). I heard a buzz from the transformer, front panel went dark, certainly "destroyed" STK7217 as I felt it was hot.
In isolation I see that Always 5.8V now measures -1.8V.
I'm most concerned about the VCR mainboard, have I damaged it?

[ChrisW6ATV]

You may not know until you can test it with suitable power supply voltages. This VCR has a pretty complex power supply overall. Have you confirmed the various transformer outputs and followed through the PW1 circuits and outputs?

I recommend doing tests like that first, and making a list of what voltages you have or do not have, before/rather than "using Youtube to look for repair ideas". I wish you success.