Did some thermal imaging of the TV today, I can see that R326 and R322 get absurdely hot after about 10 seconds of power on. These are in the power supply part of the TV.
R326 is the one at 127°C on the left, and R322 is the large one on the right.
I could also see that R493 got somewhat hot on the other side of the board, it looks to be near the vertical deflection circuit, so there's power there:
It went up to around 80°C until I turned it off, as I didn't want to keep it powered on with this fault for long.
Nothing else gets noticeably hotter than ambient temperature after 10-20 seconds of power on.
I also went and reflowed a lot of solder joints, especially in the power supply circuit, but the issue is still the same.
I am working with a guy in the UK to source and scan the P79 chassis schematics, that will make this so much easier.
In the mean time, I have this screenshot of the power supply schematics, the hot resistors are circled.
I've just tested that the power regulator transistor Q901 works with a multimeter.
