Question about Hitachi 55HDT51 55 in. HD-Ready Plasma Television

4 Answers

My TV has little green dots all over the picture.

The picture also looks like a photo negative in low light scenes in movies/TV shows on both digital cable & BluRay discs & DVD's.

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  • david_roadki Jan 28, 2009

    The previous solution attempts to explain a possible cause but no solution.

  • david_roadki Jan 29, 2009

    My Hitachi 55" plasm HDTV has flickering little greet specks all over the picture and during low level light scenes in shows & movies look metallic( as in a photo negative).
    The picture looks great in bright scenes like TV news or sports games.

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You have the problem called "diffusion" errors, or some call it non-erasing pixels, etc.. You may be able to adjust the voltages to fix the issue. The 2 main voltages are VS and VA. The value they should be is listed on the back of the plasma panel. If one is off, then it could be the cause. Some manufacturers recommend turning up or down vs or va by 10% to fix this type of issue. Unfortunately, it can also be caused by many board in the tv.. power supply (where vs and va are generated) plus also the y and z drive boards, buffer boards, etc. If they are across the whole screen, suspect the power board and Y board most likely. I can talk you through all the adjustments but you will need a dc voltmeter capable of handling 250v. Let me know your skill level and we can fix this together.

Posted on Jan 29, 2009

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This is going to be either a voltage adjustment or a faulty control board and/or Y sustain board.

You need to have a qualified technician check the voltages on these boards to determine if they need to be adjusted or else (if the voltages are fine) these boards will need to be replaced.

Posted on Jan 29, 2009

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Your green tube is trying to go out...will make the pic look black and white before too long

Posted on Jan 28, 2009

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That is called diffusion. that can be adjusted out in most cases by adjusting the y sustain pcb but can also be the main pcb, the logic pcb and panel itself but not likely

Posted on Jan 28, 2009

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