Sanyo CPT3240 no image troubleshooting

[vol.2]

It's probably in HV shutdown because there's some kind of a short on the board. I think that the H-Size pot was just a coincidence, and the reason it stopped working has more to do with something giving up the ghost. You might have a short that has blown up a resistor or a fuse or a thermistor or something like that.

I would A) completely disconnect the pots you think were a problem and just test them with a multimeter. It's very easy to do, you just measure across the pot and turn it from side to side. It should ramp up and down fairly smoothly without any obvious gaps or weird values.
B) Once you've verified the pots are okay, (with the set turned off) start testing continuity between the power rails and ground. You are looking for anything that is at or very close to zero ohms.
C) You can test all the electrolytics. I would be extremely surprised if there were no bad or high ESR lytics in the set. That could be the cause alone, although they may have taken out another component or more when you tried to power it up.
D)You will likely need the schematic, so I hope you have it. With the set hooked up to an isolation transformer, all of the power rails need to be verified.

If any of this is outside of your comfort zone and/or ability to handle lethal voltages safely, go learn how to be safe with it before proceeding.