Question about Projection Televisions

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The picture on my Hitachi Plasma TV has been "flickering" lately... this morning the picture is ghostly... can't see it! It is only 4 years old. What can be the problem? This was a VERY expensive TV.

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  • sami1333 May 24, 2008

    I don't think it's a rear projection... it just hangs on the wall.

  • sami1333 May 24, 2008

    Thanks... but this TV is HUGE! I wouldn't know where to start. I guess I should call a professional, huh?

    Thanks for you help!

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  • Master
  • 2,712 Answers

It could be the convergence IC's that need replacement. It could also be a problem with the many capacitors/resistors around the IC's.
If you are confident enough to try a DIY, here is a good step by step guide with pics to assist you. But beware, if you have no prior experience, I wouldn't recommend opening the set, as there are voltages inside that can KILL.

I suggest you get a qualified service technician to take a look and get the TV fixed.

Posted on May 24, 2008

  • Swilin Sampson
    Swilin Sampson May 24, 2008

    OOPs..I see that it is a Plasma TV..Please ignore the previous post regarding convergence IC's.

    The problem is most likely a loose connector ribbon. Also make sure that all the cables and connectors have clean contacts. You can try wiping them with a bit of isopropyl alcohol to clean the contacts.. ALso be aware that Plasma TV's are pretty sensitive to temperature and voltage fluctuations.

    Try this as well:
    Unplug all cables from all inputs to the TV, the see if the screen
    flickers on the menu screens. If it does not , you have a ground loop
    problem, which can be identified by plugging back the cables until the
    problem reappears. The problem could be due to defects in the video processing circuits.You would need a Video Isolator on this input.

    In any case, it is better to get an on the spot diagnosis by a qualified technician. The solutions provided above are all based on long distance evaluation, and will give you something to go by... But an on the spot inspection would be the best way to go..

    Hope that helps. If you have any further questions, please post back.


  • Swilin Sampson
    Swilin Sampson May 24, 2008

    Just a side note:

    As a rule of thumb, you should never, ever touch your plasma television. That is what a remote is for and if
    you are wise, you will encase it in glass. This is no joke as plasma screens are very delicate. Also, you should dust your screen on a regular basis to prevent what appears to be rainbow colored dots on the screen.

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  • Projection T... Master
  • 19,396 Answers

If it is a rear projection it is likely to be a convergence problem, what is the model?

Posted on May 24, 2008

  • Ginko
    Ginko May 24, 2008

    Sorry, on a plasma tv you need to perform service adjustements ( convergence, rgb, etc.).

    Download service manual, here is the one for Hitachi 43'' in may possess, I just uploaded it . Service procedure should be same for all hitachi plasma tv. Check from page 32 to page 48.
    Follow badongo instructions for download.

    Using service procedure involve risk of causing further damage to your tv, contact a technician if you are not confident with this kind of service on TVs.

    If after performing procedure tv still has the problem, then it is probably the Ysus board in need of replacement.



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