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Akai Plasma TV has flashing / pulsating artifacts for all inputs

This started just the other day, after I've had the tv for about a year, purchased used. As soon as it turns on, the screen starts pulsating, bright-dim-bright-dim, as it scans for an input source. After it finds and begins showing that input, the pulsating/flashing takes the form of artifact pixels - big splotches of color - in the picture. The color and the intensity of this splotchiness depends on what is being desplayed. Bright colors tend to flash more. I've uploaded a video of the problem to youtube here:

http://www.youtube.com/watch?v=A0BDUdvD4OU

I'm curious which component is likely at fault and if you think replacement of that component is needed, or if I just need to repair a connection.

Thanks for any help you can offer!

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  • remywokeup Jul 29, 2009

    Thanks for getting back to me. As I understand it, you've recommended a couple things:

    1.) Life a fuse on the zsus board and measure some voltages.
    -------- Would this be something I could do myself? I've taken the TV apart before to fix the vertical bar issue. How would I go about this?

    2.) Replace the zsus board and see if that solves the problem.
    -------- The cheapest board I could find was $75. If this does not solve the problem, I would then need a new screen which is definitely out of the question (I would just buy a new TV). So my question is how likely do you think it is that replacing the zsus will solve the problem? This will be helpful in deciding if I want to spend $75 on a "maybe" solution.

    Thanks again.


  • remywokeup Aug 03, 2009

    Thanks!

    Are the xsus, ysus and zsus 3 separate components? Any one of these could be the problem?

    What signs could I look for to help me figure out which of the three is the problem?


  • remywokeup Aug 11, 2009

    Thanks for the thorough explanation.

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A plasma TV need to be supplied continuously with power that gets then distributed to all rows and columns of the plasma panel, so to generate and maintain the picture.

In your case the voltage applied to the plasma panel is dropping, and this is causing the flash effect, with colour stains caused by plasma cells being supplied erratically.

In the best case the problem can be caused by a bad sustain board.
A bad PSU or Buffer board, or a bad chip on one of the cables connecting to plasma panel can cause loss of power to display, and you get the same effect.
The sustain boards is the most common, in that case you fix the problem replacing the Sus boards with Ysus Xsus kit.

Replacing the Ysus Xsus (or Zsus) with a kit is not a difficult operation. Sus kits are commonly available on Ebay, or from online sellers.
Testing the Sus board to ensure they are the fault is more difficult, and you will need an oscilloscope to perform the complete test.

If this comment had been helpful, then please do no not forget to leave feedback.

Thanks.

G.

Posted on Jul 29, 2009

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Generally when a tube begins to flash it's on the way out. a tempory fix is to increase the brightness ,However this drives the tube harder and reduces the kife span even more.Twelve months is a very short time for a tube to start exhibiting this behaviour, I suppose it is also out of itsw warranty period too? Akai unfortunately are not a particularly good brand as they are made by several companies parts under the Akai logo.

If you get this repaired it would be expesive, you might want to consider dropping it and claiming insurance, to get a replacement.

Posted on Aug 03, 2009

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Ok I would say that your panel is suspect and can be checked by a tv tech.There is a procedure by lifting a fuse on the zsus board and measuring voltages. The first thing I would try is replacing the zsus and then checking picture. I hope you are covered by a service contract because the panel will cost as much as the tv.

Posted on Jul 27, 2009

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