Screen is black except for thin line in middle of screen
My insignis is-tv040919 is about two years old. I turned it on today and there is a thin line in the middle of the screen that is obviously the picture and the rest is black.
I have a Mitsubishi CS-27205 that was purchased in 1994.
It's a great television, (15 years old)
but today, I turned it on and also have the same problem:
thin horizontal line of color where the picture should be.
Rest of the screen is black.
Can not find anything in the troubleshooting guide relating to this type of problem.
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The problem is in the vertical section of the main board. Bad capacitors and maybe the vertical IC. If you are not inclined to be a tech you will have to take it to a shop.. I don't know what they may charge but I normally get $69- $89
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Check and replace its back light CCFL lamps. If these are faulty, this kind of fault can occur. When replace it, replace all. None one or two. If you wish to get more details about the back light CCFL lamps and its working, check this link. Pull up older posts there.http://electronicshelponline.blogspot.com/
The line is there because the vertical deflection unit - the one that spreads that line across the entire screen to form the image - has failed. Replacing it is a job for a professional, or at least an experienced amateur, and the parts will be quite difficult to find for such an old tv .
you have a shorted green CRT that is affecting the other crts the short is internat to the crt that leaves what is called retrace lines. if the set is more than three years old then replace all three guns.
this symptom, sometimes called the tube light effect, it is characterised by a bright thin horizontal line across the middle of the screen. this symptom is caused by a breakdown in the vertical deflection circuit. hence maybe the trouble maybe in the vertical oscillator, amplifier or output circuits. but if all i have said is not clear to you, better bring it to a qualified tv technician. good luck!
Those lines sound like "retrace lines" and several things can cause them. The most common are shorts inside the picture tube and shorted semiconductors in the video driver circuits. They can also be seen if the blue screen voltage is too high or if someone has tampered with the screen voltage control.