When you turn the tv on you get a dark screen with lines running through it and after a few seconds the tv just turns off. You can't adjust anything or see a picture at all. The standby light blinks the entire time but it isn't just one number. Sometimes it blinks 4 times sometimes 6.
When the TV comes on, the picture is fine ... all colors are normal. Then, after about 15 to 20 seconds, it turns off ... yet the audio remains. The screen does not go completely black but one can see a faint diagonal "signal" on screen. I'm going to unplug the TV for about a day and see what happens. I don't know if it's a thermal problem of a component or if the system needs a re-initialization.
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sounds like a vertical problem, usually you'll see one white line across the screen, but one I worked on would come on and the bottom half of the picture was gone and there were lines across the top of the screen.
If you know how to solder & can find the vertical output chip then you could try resoldering the pins. If this doesn't fix it then it needs new parts.
When this kind of set comes in for this problem, it is typically caused by a leaky/intermittent diode D402, located next to the heat sink for the vertical deflection IC. I will typically also replace the vertical deflection IC at the same time, just to avoid repeat failures.
The problem turned out to be caused by a poor solder joint on R530. This is in the HV sensing circuit and is associated with IC501/ comparator. The resistor was replaced for good measure and proper operation restored.
This 30" flat screen TV set may have a problem in the high voltage circuit of the TV set. You may be able to adjust this by taking off the back of the TV set. Look for the block where the large red wire runs up to the top of the picture tube. On this block will be two controls. one will say screen and one will say focus. Try and slowly turn the control that says screen or S on it clockwise and see if you can make the picture brighter. Turn up the control till you just start to see faint lines in the picture, then back the control down till the lines go away. If the picture does not come up when you turn this up, and all you get is a blank screen, you will need to have this set repaired by a qualified repair person. Good Luck
Usually that symptom is caused by cracked solder joints on the vertical output IC. As the IC starts heating up, the picture starts breaking up at the top with several "dancing" dark lines appearing, the top scrunches down and then when the vertical quits altogether, the screen goes completely black. A good slap on the side of the TV might make it happen faster or clear it up temporarily. If you have experience working on PC boards then you can resolder the pins of the vertical output IC but if you have never soldered parts on PC boards then allow a qualified tech to handle it for you.
You have whats known in the biz as a cold solder connection on the vertical output IC or on the associated components. Not a job for the handi-man unless you know the issues with safty, and precautions to take with Hi voltage inside of tv sets. Shouldnrt cost much for the local shop to find your problem . Now on rare occations the poor connections are inside the IC and the IC has to be replaced. Good Luck