Question about Projection Televisions

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Wavy diagonal lines appear on the TV screen and will not go away. Does the lamp need to be replaced? We know it is not the Cable or DVD.

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  • stollme Dec 02, 2008

    We have had this TV set now for 5 years and did not have any of this prior to a few days ago. What do you suggest we try first? We have unplugged the TV. We have had the cable checked over the phone. Do we get a new power strip and if so, what might be one you would recommend? Thanks for all your help.

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  • Master
  • 6,966 Answers

Hi and welcome to FixYa,

Often, what you described as way lines could very well be AC component riding on the video signals. Based on this, areas that could be explored are:

  • any other devices on or near the TV such as wireless phones, lamps, even the DVD, cable box and others. Pls try using a different outlet;
  • try using a filtered power strip or an appropriate voltage regulator, something like what is used for desktop computers but with the power rating appropriate for the TV;
  • try plugging the TV itself in another outlet;
  • temporarily remove the cable connection and determine if the wavy lines persist;
  • in some worst case scenarios, this could be a faulty capacitor in the power supply of the TV;
  • still it could be as simple as RCA to RCA cables that are flimsy and/or with inadequate shielding and/or running parallel to power cords.
Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Posted on Dec 01, 2008

  • Louie  Role
    Louie Role Dec 02, 2008

    Glad to be able to give you ideas and appreciate the rating too.

    Filtered powerstrips would look like image below.

    They are normally available from most audio/tv or electronic shops stores. At times equivalent could also be found in computer shops.

    While they would look like ordinary extensions, it must have surge protectors and filtering built-in.


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I have a KF-42E200A Sony Bravia LCD tv. Recently we had to replace the lamp. Since then a horizontal line appeared at the top of the screen and it has grown to about 3 inches now. The picture itself is...


The lenses in the TV are more than likely misaligned due to heat from lamp. The heat can cause the lenses to move and the red shaded horizontal line appears over time because the lenses fall out of alignment.

You just need to have the lenses realigned and the red shading will go away.

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Picture was fine, then lines diagonally, now light


Projection sets have two very common problems outlined below.

The first common problem is convergence

These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. The TV can also shut down when the convergence starts to fail.

Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

Convergence problems are very common on all Projection TV sets including Sony, Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer, Hitachi,Mitsubishi,Zenith, RCA and others.


You can more info and a DIY convergenece repair kit with instructions from TV Repair Kits using the link at the end of this article.

Here are some of the most common problems with these sets...

*Screen Looks 3-D
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Problem #2 - Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

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bb0cf99.pngSOLUTION

You can see some more examples and find a fix using this link on Fixya

http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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There are wavy colored lines an the screen all the


A problem like yours is NORMALLY NOT the TV set's fault....it's the Cable.

I'll bet you see thin lines moving across the entire picture...they are slanted like this >> \ \ \ \
That's generally caused by a bad ground on the antenna cable OR it can be the cable box's MODULATOR.

Try using your VIDEO OUTPUT off of your Cable box and see if the wavy lines are still present. If they are the Cable box needs swapped with a good unit.

You can also verify this problem by checking your TV with a DVD player...no lines indicate the TV is fine.

If you have problems with the DVD player's picture, then you must have dried out filtering capacitors on the Video board IN the TV set...

And THAT is not an easy fix if you do see lines with your DVD player.

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Black bar along bottom of screen


Your TV is just getting "old" and there is parts that need to be replaced. The total for the parts needed would be more than what the TV is worth.

Thank you for using Fix Ya!
If you have anymore questions, let me know.

Don't forget to rate to overall satisfaction of this solution.

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the DM board is going bad and needs to be rebuilt. check out www.tv-techs.com

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