Question about Projection Televisions

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I have a magnavox model # 32MF23ID and serial # BZ2A0628360393. It was manufactured July 2006 and purchased during xmas holidays 2006. It started with the tv going blank on oncassion. But now, the tv comes on for approximately 20 - 30 seconds and then the screen turns into a sheet of green(no picture-all green) with regular sound of the program in the background.

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  • gbynoe Sep 10, 2008

    There is no fluctuation. You see a clear piture for 20-30 seconds then it blanks out in all green and the sound from the program continues as if the picture were visible.

  • gbynoe Sep 10, 2008

    There is no fluctuation. The scereen appears for 20-30 seconds then blanks out in green and te sound continues as if the picture were visible.

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Yes i agree with ohms. it must be an ic was burnt or some hardware on your tv was got problem. better to send it to repair service.

CHARCOIS

Posted on Sep 10, 2008

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Check the convergence. That is what controls what you see in teh screen & it always burns out.

Posted on Sep 10, 2008

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Pure Green Screen is the lost of bias on the control grid of the Red and Blue gun. Spotty green around the edges means you need to converge or demagnetize your CRT. You can adjust the screen and drive variable resistors (pots) located on the circuit card around the neck of the picture tube. If you remove the antenna signal and if all controls are equally set, you should get a Black & White snowy picture or at least adjust for that. Remember, there is Very High Voltage around that area. Proceed with extreme caution.

Posted on Sep 10, 2008

  • Narmada Anand
    Narmada Anand Sep 10, 2008

    Also, You can demagnetize your TV by using one of the bulk erasers that the
    Radio shack sells. Start from the middle of the screen, circle the
    eraser counter clockwise motion all the way to the border of the screen
    in the pull out position, repeat this procedure for a few times. If the
    problem is still exist, check the distance of the sub to your TV, must
    be at least more than 8 feet, if not move that big monster further away
    from your TV. After you do this and still have the problem, your TV
    tube is damage and need to be replaced. You will have to consider
    either to repair or buy a new TV whichever way is more cost effective.

    Thanks


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This seems to be a convergence problem; very common for all kinds of projection systems.

The boards mentioned in the reply you referenced should be the right ones. Replacing the board usually solves the problem, but without actually seeing the set I cannot be 100% sure of it. So, you have some risk by just replacing the board and then finding out the problem is somewhere else.

Maybe you should do some testing and checking first to pin it down a little more certainly. Obtaining a service manual would be helpful because it has further detail on how to check convergence, etc. and would give you a better confidence level as to what is going on.

Some have repaired the convergence by replacing the IC chip set. They dissipate alot of heat and sometimes just burn out. Replacing them is cheaper than replacing the whole board, but it requires a high level of skill in soldering and general electronic hardware.

Posted on Sep 10, 2008

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If you have sound and no picture it can be a broken lamp, or a bad light engine.

Posted on Sep 10, 2008

  • 2 more comments 
  • Ginko
    Ginko Sep 10, 2008

    Sorry, I can see this is an LCD, not a DLP TV,

    On LCD you have a sound board separated from video controller.
    It can be the ribbon cable or the connector not well connected to board or LCD screen, or the video board must be replaced.


  • Ginko
    Ginko Sep 10, 2008

    This is an LCD, it has no convergence board, see if it sensible to whack , hit tv gently on the sides and see if picture comes and go, if it does, then it is a connector, if not it is either a bad cable, a bad connector , or a faulty video pcb.

  • Ginko
    Ginko Sep 10, 2008

    That is not a CRT or a DLP tv , there is no convergence.

    what you need to do is testing some component like parts U401~U405, U407, U409, U301 you follow a diagram to identify the bad part, then replace it using a solderer and paste in the right way, not to blow the ICs.

    What you probably need to do is calling a technician for a home repair, you can use the phone number listed in the user manual.

    Here you get all parts for your TV, get a service manual first if you want to do it yourself:
    32MF231D/37

    Regards


  • Ginko
    Ginko Sep 10, 2008

    After you test the connectors,
    This are probably what you need to test.
    Better to buy an extended guaranty and call repair service, calls start at $80.



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Well,, probably the capacitor controlling the picture must have stopped working...do you see anything like fluctuation of the image on the screen or it just blacks out....

replacing it will solve your problem..
call for a repairman

Posted on Sep 10, 2008

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