Hi. If it takes a few seconds you can measure tensions. The most important.
Vertical.
Chroma
Scrin
ABL
And comment a little and also make a report of everything you controlled. If you reviewed welding in general at least.
See what it does on the screen or what it manifests if you still have the scrin
Not long ago, the TVE only turns on and off, does not reach 3 seconds and the voltages of the + by main filter remain stable the filter in 170v and + b in 110v
Your problem could be in the jungle, I had that same problem before with one of the same brand and I had no more to return it, I was very expensive to get another jungle, I hope it is not that friend
I already managed to turn it on was a resistance, now the problem is that when I change the channel CH- it turns off ...... it drives me crazy