I have a 32" Sony Trinitron. The picture is great but after a short time (a minute or two) the image starts to deteriorate. Blacks lines appear on the screen and seconds later the image fades to black. If I turn it off and on the same process happens again, only quicker because the set is already warm.
I would say that the tube is fine given that the image is good...even if only for a few seconds. Could it just be overheating? Capacitors? Does it just need cleaning or are we talking about some real $ to service it?
Thanks for the help,
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Re: 32" Trinitron warms up picture goes black
You need to call for service now that the unit still turns on,the problem will become expensive if you try to use it like this,right now the set might have loose conections in the power supply,horizontal driver transformer.ETC.Be safe and call a service tech.
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Yes.... u must adjust the screen voltage going to picture tube....located on the CRT module>>>little board connected directly to picture tube (take back off TV and you will see ) play around with screen control on the CRT module......can be adjusted at times to keep from losing picture!!! tube is bad...i know sure looks good when showing a picture....TRY adjusting screen voltage ( YES while TV is ON>>>CAREFULL ) gl
This could be a sign that the picture tube is starting to fail. To prove this try the following: Please note that there are potentially dangerous high voltages present inside the set, so be careful.
Unplug the set and remove the back. Locate the flyback transformer (lower right when facing the back of the set and has a lare red wire coming out the top.) There should be 2 controls on that part. One should be labeled screen the other focus. Turn the screen control slightly clockwise. Turn on the set. If the blanking stops, then this will "fix" the problem for a short period. This is not a final fix, but a short tern remedy to give you time to locate a replacement set.
If the above does not resolve the problem, please update this and we'll investigate further.
Hi, tubes getting tired, band-aid fix you can do is remove back of set and turn up(clockwise) the screen control( small black plastic control mounted on side of flyback transformer, do not turn the knob marked focus) until you see a whole bunch of white lines across the screen, then turn same control counter-clockwise until all the lines go away, try several different channels to be sure all the retrace lines are gone, you`ll get up to 1 year more use out of it, than she`s done, good luck, BMW Rider
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.