When watching tv, the screen on my tv will shut off. I have sound sometimes, I've waited a few moments and tried turning it back on, But the tv will return itself off. The bloody thing is only 2 yrs old.
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The problem of your tv is only a loosed solder.Remove the back cover of your tv but be sure to unplug it then try to look the solder part of your tv look for some loosed solder then try to resolder it using a soldering iron but be sure not to connect separated pin in the pcb.
That probably happened because something hit the TV and broke the line for pictures to get through, or because a wire in you TV is bad and doesn't wanna work. This happened to my TV every few days. What I did is give it a few whacks every now and then on top of it and the vision came back, but don't try that if you think your TV is fragile. Yes I know its sounds stereotypical but it actually sometimes works.
Sounds like trouble in the standby/power up circuit. have you tried unplugging the TV for a half hour and seeing what happens? It might start up but I think this problem won't go away. If you heard a high pitched buzzing it sounds like a problem in the high voltage not letting the start up circuit work. threy are related. The start up circuit waits for the high voltage to stablize and then switches it on.
You can take off the back of the tv. Look for the red wire at the top of the tube. Follow it down to the part that it goes into. On that part (transformer) there are 2 controlls. The one marked SCREEN, is the one you can turn up and watch the screen at the same time. If the tv shuts off, put that control back to the original position. If it brings up the brightness, then it is fixed. If not, take to a repair shop.
This sounds to be a faulty flyback transformer, as it heats it gets a shorted winding and the protection circuit shuts the set down to avoid big sparks. this is not a user solvable problem unfortunately and i would recommend taking it to an electronics repair shop and getting a quote for repair.