Question about Mitsubishi VS-50605 50" Rear Projection Television

5 Answers

Red tinted picture

When the tv first comes on it has alot of static in picture, it clears up after a few minutes. The picture was red tinted and had a wave through the bottom of the screen. I replaced the convergence chips, the wave is gone. The picture is still red tinted and kinda dull, will not adjust. When I turn up the contrast or color tint it shows a green spot on the bottom right side of the screen like the green lamp is only projecting in that spot. Thanks in advance

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  • 3 more comments 
  • Perkspc Apr 03, 2008

    Model is a Mitsubushi VS-50VA1

  • Perkspc Apr 03, 2008

    It seems to be some kind of color balance issue maybe.

  • Perkspc Apr 03, 2008

    I do computer and appliance repair. I have electronic component repair schooling. AC/DC Classes. My problem is I am not very familiar with tv repair and if this is the symptom then I don't know to look in which area of the tv for the problem area. I know just enough about it to get me in this bind of having this tv apart and not knowing where to look next. I have repaired many tv's as far as bad caps, flybacks focus blocks, and convergence chips. Point me in the right direction for these symptoms. Thanks

  • Perkspc Apr 04, 2008

    Anyone

  • Perkspc Apr 04, 2008

    I have noticed that on the convergence screen where it says "red", you can read the red text fine. When where it is supposed to say "blue", you can barely see the text word blue at all and what you do see of the word is blurred out. Thanks

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5 Answers

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How old is your TV?
It looks like it could be CRT coolant is not clean, after a period of time this coolant inside the CRT creates fungus inside affecting the quality of the picture and colors as well.
Check this site to have a better idea on what to do.

Posted on Apr 04, 2008

  • Jaime Hernandez Apr 04, 2008

    I would suggest to do some reading from the link I sent you.

    I have fixed a good number of CRT with the same problems. The only problem is time consuming and not many techs like to do it, instead they change the whole CRT.

    The coolant inside become like dull and that affect the color focusing.


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You can download your service manual at link below
http://www.eserviceinfo.com/downloadsm/19913/mitsubishi_vs-50605.html

Posted on Apr 04, 2008

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Check if the LCD's are all in working order

Posted on Apr 04, 2008

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How techically inclined are you to do this level of troubleshooting?

Posted on Apr 03, 2008

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HI,

Try reseting the TV first by unpluging all the cords for 4hrs and then plug it back.

I will be posting more troubleshooting steps..

Posted on Apr 03, 2008

  • 2 more comments 
  • Priya darshan Apr 03, 2008

    ONE: Check the line cord. Wiggle both ends near the molded part.

    TWO: Make sure you have power in the outlet by plugging a lamp into the same exact outlet.

    THREE:The whacking test is to just bang or smack the set with your hand
    on the back, side, top, etc., to see if there are loose connections or
    cold solder joints inside that are acting up. If so, the banging should
    knock them back to normal and the set should restore. You might have
    to use some creative banging and some have had to put a book or
    magazine under one corner to torque the chassis enough to get it to
    work reliably.

  • Priya darshan Apr 03, 2008

    Check the video input to the CRT video driver board and signals on that board.
    If B/W picture is also bad, then you can compare red and green signals
    to determine where they are becoming different. The red lines in your
    description sounds like the red video output circuit is drifting and messing
    up the background level, blanking, screen, or other setting. Could be a
    capacitor or other component.


  • Priya darshan Apr 03, 2008

    Where only one color is showing, suspect an incorrectly adjusted individual
    background/bias control or bad part on the CRT neck board for that color.




    • Individual brightness/background/bias control(s) - mark setting of pot for
      the problem color and then see if a slight adjustment removes the retrace
      lines. See the chapter: "TV Adjustments". Of course, if this happened
      suddenly, the problem is not due to a misadjusted control though a dirty
      pot is possible - turn it back and forth - this might clean it and restore
      normal operation.



    • Component or connection on CRT neck board - insufficient voltage to or
      incorrect biasing of the video driver for this color can result in the
      CRT never totally blanking. Compare voltages and signals, and swap
      components between good and bad channels to confirm.



    • Blanking circuit - this may be a part of the video/chroma chip or separate.
      Check and compare waveforms of good and bad colors to determine if the
      blanking pulses are making it to the video output.


    There is a slight possibility that a bad CRT may result in visible retrace
    lines. To eliminate this possibility:





    • Disconnect the filament - all evidence of a picture, raster, and retrace
      lines should disappear once the filaments/cathodes have cooled (15 seconds
      or so. If there are still visible retrace lines, the CRT is suffering
      from cold or field emission from someplace (may not even be the cathode).



    • Turn down the screen control on the flyback (usually). If one color
      remains no matter how you set the control, again there is some kind of
      weird emission from the CRT. However, if white/gray retrace lines remain,
      the problem may be in the screen supply.

  • Priya darshan Apr 03, 2008

    I hope all this info. is sufficient for you.

    Goodluck,
    Please don't forget to rate the solution.

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Picture Mode: Expert1
*Backlight: 16
*Contrast: 83
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