Question about Mitsubishi WS-65411 65" Rear Projection Television

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Red Green Blue horizontal line at top of screen

I have replaced the convergence and vertical output ICs in this set because it was powering off. The set now works fine and looks pretty good with the exception of having 1 each of a red green and blue horizontal line in the topmost portion of the screen. I'm guessing that there is something in the vertical output circuits causing this, but am pretty clueless as to where to look now. Note that all the electrolytic caps associated with the vertical output IC were also replaced.

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  • Mopela Feb 07, 2008

    Mr Bob,

    Thanks for responding.

    Well, actually the convergence ICs have been replaced again since then and the problem remains. Also, I have tried vertical height and the lines remain (they do move with the height adjustment).

    I have also tried the vertical sawtooth adjustments to no avail.

    Mike

  • Mopela Feb 07, 2008

    The lines are separate, and bowed (this leads me not to suspect the convergence ICs themselves since I would think the lines would not be separate and not with a pronounced bow to them). The picture looks fine (very linear and convergence is fine)except for these three lines.

    The reason I replaced the output IC was because after originally replacing the convergence ICs I continued to have a problem with the set shutting off (vertical height would vary until the set ended up turning off). Unfortunately, I replaced the convergence and output ICs this time.

    Neither of the 24v fuses ever blew.

    I have no idea what might affect this in the sm. I have tried VHGT, VCNT, VSTR and VOFS to no avail. Any suggestions as to what else to try in the sm?

  • Mopela Feb 07, 2008

    Bob,

    I'd hate to use up anymore of your time right now. I am going to replace the output IC again and see if this helps first. (I do have good reasons for trying this, which would take too much to detail here). I'll contact you off list though to detail it a bit more.

    Thanks again - Mike

  • Mopela Feb 15, 2008

    I finally got around to replacing the vertical output IC again and this fixed the problem. I must have gotten a bad one originally!

    Thanks to Mr Bob for his help also!


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Since both were replaced at one time, you now can't limit the problem properly. Should have been done one at a time.

Your vert height may be too short, causing you to be seeing things that should be off screen.

This can be remedied in the service mode.


Mr Bob

Posted on Feb 07, 2008

  • Robert Jones
    Robert Jones Feb 07, 2008

    Are the lines separate? Or do they form 1 white line?



    If separate, more work in the sm may be needed.



    Is the pic squinched up at all? If so the vert IC may need to be replaced again -



    I never see this kind of thing when I just replace the conv ICs. The vertical IC on these HDreadys rarely need attention, I would not have replaced it, esp. if I had found either of the 5A conv rail fuses blown - plus and minus 24v.

  • Robert Jones
    Robert Jones Feb 07, 2008

    This is turning into a more complex question. I am available for phone consulation if you wish, and we'll wrestle this to the ground together. Contact me directly.





    Mr Bob

    www.imageperfection.com

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