Insignia tv powers off at random

[Sealtest]

Originally Posted by Electronic M

Don't give up on more precise help just yet. Your post isn't even a day old, and I have only worked on a couple of LCD sets...(I tend to view anything without vacuum tubes in it as disposable junk and don't often bother to try fixing it).

I went ahead and ordered a replacement mainboard listed online as "working", so we shall see.

I understand what you mean though. I used to work on CRT solid state sets some with pretty good success. I cleaned out a few tv repair shops and got all sorts of schematics, casefiles, tools, etc and went pretty hard for a while on repairing sets. Those things I mostly understood but my experience was mostly in vintage audio repair. All parts are through-hole and nice and easy to work on..

All tube chassis are another story. I have a mint condition 1955 RCA floor tv in a metal cabinet, and a rough Admiral from 1953. Those I would recap, test tubes, take measurements, with no luck. One of these days I will have to get on those again. I cleaned out a repair shop and got some extension cables to keep the CRT connected to the chassis for adjustments. I have the tools but have the TV's stored with family.

At least with flat panel sets I can take them back to the dumpster they came from.

I'll update when I get the new board for this set, and go from there.