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We have a 42" Hewlett-Packard HD Plasma TV. It's

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  • revrichar395 Apr 09, 2011

    I don't have a soldering iron but I could go and buy one. I worked with one many years ago so I do remember how to use one. Where would I get capacitors from? Radio Shack?

  • revrichar395 Apr 09, 2011

    How would I know if the YSUS circuit boards need to be replaced instead of or in addition to capacitors?

  • revrichar395 Apr 09, 2011

    How will I if I need to replace the Ysus circuit board as well?

  • revrichar395 Apr 09, 2011

    ...I know...

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  • HP Master
  • 1,591 Answers

There's a good chance you have failing electrolytic capacitors either in the power section or the inverter section or both.
Any caps in these sections that look bulged at the top, or bulged/leaking at the bottom need to be replaced.
If you repeatedly turn it on, eventually the screen may come on, but every time you turn it off, the TV will get harder and harder to start up until one day it just won't.
Sometimes you have to do the opposite to start it up and unplug it for 5 mins, then try.

If you aren't tech savvy, don't worry, read the rest of this solution and watch the videos.

If you are handy with a soldering iron and can identify the power supply and inverter / FM section for the backlights, an inexpensive handful of capacitors will likely fix you right up.
Match the capacitance on the capacitors. Go over voltage if you can, and still have them fit.
IE - it's not a bad idea to replace a 10V cap with a 16V or 25V or even a 50V, but don't replace a 680uF cap with a 500uF or a 1000uF (unless you are positive it's only doing ripple filtering, and even then, you should go OVER, not under the uF rating).

Most of the caps that go are 10V 1000uF or 3300uF.

I found some great videos of the procedure (for many Samsungs with the same issue) on youtube.

http://www.youtube.com/watch?v=Mm51C_RDIZE
http://www.youtube.com/watch?v=BNHHrgX_6cs&feature=related
http://www.youtube.com/watch?v=8l0AUj8QUkg&NR=1&feature=fvwp
http://www.youtube.com/watch?v=Y7b_nTaZYcU&feature=related

As you can see, this issue spans plasma TVs, as well as large and small LCD TVs and monitors.
The parts are cheap, and skill required is minimal.

Posted on Apr 09, 2011

Testimonial: "Great advice thanks. "

  • 3 more comments 
  • revrichar395 Apr 09, 2011

    Where do I get capacitors from? Radio Shack?

  • Norman Skinner
    Norman Skinner Apr 09, 2011

    If you had watched the videos, you would have heard at least one of them mentioning that they got their caps from Radio Shack, but pretty much any electronics shop will have them such as The source by Circuit City etc. or you can order them online.

  • Norman Skinner
    Norman Skinner Apr 09, 2011

    don't forget to follow the guidelines...it's ok to go over-voltage but stick to the right value of capacitance and try to stay close to the same physical size, or you may not be able to get the casings back on.

  • revrichar395 Apr 09, 2011

    I took the back panel off and I can identify the power supply and inverter / FM section but none of the capacitors are bulging or leaking. They all appear to be in great condition. Any ideas on what to look for now?

  • Norman Skinner
    Norman Skinner Apr 09, 2011

    check for fusible links between the power supply and the other boards.
    Pay special attention to any board directly attached to the screen and the board it's cabled to (and check that cable really good too!)http://www.google.ca/images?hl=en&so...
    that link will give you an idea of the different types of surface mount fuses so that you have a better idea of what to look for.
    And remember, the caps may not be completely domed or leaking fluid...look for caps that are even a bit convex!
    Oh, and stop looking in the inverter section if that's actually a plasma TV, because there isn't one....sorry...lol...
    If however it's actually LCD and not plasma, I'd look very closely at the inverter section and fusible links going there.

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