Top Tip!
Note; This is not an endorsement, but simply a money saver tip. I have an old 60 inch LG TV that had given up the ghost last year. When you turned it on, either by remote or manually, it would come on for a second or two, then shut off automatically.
It's a tv we don't use much so I didn't really worry about it, apart from googling the question and finding no real solutions online. I called some local repairers, they wanted $110 just to look at it!
As winter kicked in this year, I was contemplating taking the old tv to the dump and just out of morbid curiosity, plugged it in and it worked. Then, after it heated up it cut out again. A mate of mine, Bruce Kerr (owner of Kerr Solutions here in rocky - (small plug there, Bruce lol) told me once that computers with dust do the same thing, so I wondered.....
Sure enough, after unscrewing about 400 screws from the back of this gigantic thing, the small thermos fan on the right hand side was almost completely clogged with dust build up over the 9 years we've had it. There is a large bar type fan at the top too that was slightly clogged. So the tv worked in the cooler months, but only until it warmed up.
After giving it all a light brush and vacuum, hey presto...the BIG screen lives again. So the moral of the story is, don't trust tv techs and have a lash yourself. You'll save a quid!!