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WHEN I TURN ON TV I HAVE A RED POWER LIGHT AND A VERY LIGHT WHITE SCREEN NO VIDEO. WHEN I TURN OFF THE RED LIGHT GOES AWAY BUT SCREEN WILL STAY VERY LIGHT WHITE UNTILL UNPLUGGING.

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  • Dennis McCollum Jun 22, 2011

    I have looked at the power supply bd and there are no bad capactors,this may be power surge,is there any other damage then the power supply or is the power supply most lickly, i do get a dim screen but no video/audio

  • Dennis McCollum Jun 23, 2011

    Toshiba TH42PZ80U Lights up but no video/audio. no caps bad in power supply

  • Dennis McCollum Jun 23, 2011

    yes it is a Panasonic. The red light does not blink stays on

  • Dennis McCollum Jun 23, 2011

    Yes it is a Panasonic. The red light does not blink.

  • Dennis McCollum Jun 25, 2011

    panasonic th50px80u plasma

  • Dennis McCollum Jun 25, 2011

    This does not have thje capactor problem,any other suggestion.model is th50px80u plasma

  • Dennis McCollum Jun 25, 2011

    no audio or video. I suppect the A board

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  • Master
  • 4,889 Answers

The dim glow you are seeing is coz the backlight is coming on. It means that everything else except the main A/V board is operational so that is the source of the problem. I believe this is an LCD flat panel tv. Please get me the model number of the tv so that I can get you a pic of the board. you are gonna have to open the tv up, locate a board that looks like that and get me the part number off it so that I can get you the link to the replacment

Posted on Jun 23, 2011

  • eagle338
    eagle338 Jun 25, 2011

    Ok sorry about that. I thought this was an LCD. So does "no video" mean that you have sound but no picture or no picture and no sound? This is not a capacitor issue. Its either a main A/V board issue or a buffer board issue depending on your reply to my question.

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  • Master
  • 2,098 Answers

Hi,
May I know the exact brand and model no of your unit, it will help diagnose where the fault came from.
Jdvillanueva

Posted on Jun 22, 2011

  • Jdvillanueva
    Jdvillanueva Jun 23, 2011

    I know this model no is for Panasonic.



    Please let me know if the red light at the front panel is blinking, if so count how many times it will blinks.

  • Jdvillanueva
    Jdvillanueva Jun 23, 2011

    Follow the steps below to access the "Self Check Mode".



    Press and hold the "Volume (-)" button on the main unit, "OK" button on the remote control at the same time for more than 3 secs.



    or



    Press and hold the "Volume ( - ) button on the main unit, "Menu" button on the remote control at the same time for more than 3 secs.



    Self check screen will be display.



    Let me know what will be the result.



    Jdvillanueva

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  • Master
  • 6,993 Answers

Hello,
The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.
The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board. You might be lucky it's just a blow fuse. Also a defective transformer can cause your TV not to power on.
All these can be checked on the power supply board.
But more often bad capacitors causes problem on the power supply board. I do not think the power board needs replacement, rather those defective capacitors is causing this issue. Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.
The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)
You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.
What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).
You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board to save you some stress.
Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.
If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.
I hope this helps.
Regards.

Posted on Jun 22, 2011

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Posted on Jan 02, 2017

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