Question about Mitsubishi VS-70707 70" Rear Projection Television

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Mitsubishi VS70707 Has developed subtle lines in picture

My son was watching Tom and Jerry one day when I noticed the TV was displaying really vague horizontal lines in the picture. The lines went away and I figured they were from the cartoon, but they soon came back. They create a soft flicker like the tv isn't refreshing fast enough. Most people don't notice them unless you point them out. If you can't see them from across the room, but you can when you within 10 ft of the screen. They used to only appear on bright backgrounds, especially white, but now show thru at all times. I cleaned some of the dust off of the chassis, made sure all of the boards and cables were seated properly and tapped on the heat sink to knock loose all of the dust. After this, the lines were almost gone, but came back after a couple of hours. The tv is rated for 850 lines of resolution, but it appears as if I am only getting half of that. It doesn't matter what input I use or form of media, it is present on DVDs, games, cable. I love this TV and would like to hold of on a replacement, but just can't figure out what is causing my line problem. Any ideas would be greatly appreciated! Thanks!

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  • mechelecman Feb 17, 2009

    Great idea, but it only made the picture blurry. Here is an image so you can see the lines. You may have to zoom in to see them.


  • mechelecman Feb 17, 2009

    Sorry, the picture's not posting. I can e-mail it too you if you would like to see it.

    Thanks!

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If they are faint white lines, they are called re-trace lines. They are caused when the current to the CRTs is too high. One way to check is to turn the brightness down. They should go away, but if the picture is too dark, you will need to turn down the "screen" control. This will take some handy work. If you are handy enough, take the grill off the front. Inside you will see a little black box, about 5 inches wide. there are 6 knobs on it, 2 for each color. One row is for focus (each) the other for screen (brightness). It is written on the part. The trick is to turn each of them down equally or risk having a slight tint of color. Really not hard at all, but requires the TV to be on to see. You shouldn't need to turn it but a fraction. Good luck.

Posted on Feb 17, 2009

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