If the loss of picture is either on top half or bottom half of screen. there are y buffer boards that go from top to bottom on left side of screen when looking at back that control those sections. when there is loss of half of picture then buffer associated with that area would be at fault and would need to be replaced. when i see a degrading symptom such as loss of picture on top half or bottom half leading to no picture issue normally you would check heat syncs on y sustain board and if not heating up after a few minutes of being turned on would recommend replacing y main and both y upper and lower y buffer boards as they complete a circuit
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You either have a cold solder joint in your horizontal deflection circuits or your or in your horizontal output circuit. please be careful due to the fly-back transformer still holds power even unplugged until you discharge it.( ground it out). Hope this helps.
checked the vedeo section of the main PCB of the unit, maybe some defective parts, try to look the back of the picture tube if theres a light, if none, cheke also the horizontal section, especially the flyback transformer
you'll have to take the back off the tv and on your right you'll see two black button on the flyback transformer one over the other the other the top button is for the focus you can bright or darken the image on your screen don't be afraid it will not bite as long as you don't touch nothing but the button with a phillips screwdriver and don't have the kids around when you are doing it
I found your site confusing. If you had read my post, you would have noticed that my problem referred to a 15" flat screen 'CELLO' .TV/DVD combo. I had sound but no picture. When switched on, the screen lit up and the word CELLO appeared then the sreen went black
This is a simple and common problem. The solder joints on the vertical output IC have cracked loose. I actually did a housecall on the exact same set with the exact same symptoms this morning! A good tech will resolder the pins of the vertical output IC and all other major solder joints on the main board and the set will play fine.