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61 inch Hitachi SD tv. Has been developing an increasing tendency to stop showing its picture, even though the power light is not on. My first thought when it first occurred was that I leaned on the remote and hit the input or something. But no, when I hit the input button, nothing showed on the screen, not even the green input letters. So, I turned it off, and then turned it back on. That had zero effect. The power light was on, but no picture, not even the input letters or the menu. So I tried unplugging the power for a few minutes, theorizing that some breaker or capacitor might drain or reset from a power surge or something. This worked. But, that pattern above has been increasing in frequency, until finally, today is apparently the feared day when the technique no longer worked. So, the power light is on, but no picture. Any ideas?

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  • matt885 Oct 14, 2010

    The only one I found was 2200uf 10V, and I could not identify anything weird about them. When you say "vented", the only capacitors that even remotely look weird are these big fat ones on the end which have a white mark which seems like it *might* be designed to display venting along this white marker on the wrapper. These bigger ones are labeled 250V 330uf and there are a pair of them. Is that what you mean?

    Nothing else really looks abnormal.

    Even the fuse looks normal.

    Just to make sure we are talking about the same thing, this is a Hitachi model 69SDX88B made in December 1998.

    There is one thing at the end that looks kinda puffy, bit it doesn't look like the other cylindrical capacitors. But, it still looks like a capacitor from my memory of smaller capacitors. It says 332 J 638 * U. There is another small capacitor at the end of the board that is leaning off to the side, but it seems like it was just put on that way.
    What do you think?

  • matt885 Oct 14, 2010

    I am pretty sure that the sound does work, I think it is the picture only, but I cannot tell right now because I have taken the power board out to check the capacitors. Just so that you know, what I was checking was for a puffy, blown out or venting capacitor.

    I only saw one on the board that looked "puffy" but I don't know if that was the normal state of the capacitor or not, but none of the capacitors that look like cylinders really look bad in any way, but I'm not sure what "venting" would look like.

    Thoughts?

  • matt885 Oct 15, 2010

    Do you happen to know the board positions of those components? I am trying to find them, but I don't read anything that sounds like the IC's you mention. Or, if you like, perhaps you can indicate on the linked picture?


  • matt885 Oct 22, 2010

    How exactly do I check the controlling IC with a voltmeter? what should it read? I'm not an expert on electronics, I have done a few things over the years, but nothing super-serious.

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Yes, it's exactly what you thought - the power source no longer delivers the high tension. And since it has been a progressively worse problem (and not a sudden one) it's surely capacitor related - they have aged . BTW by aged i mean that their capacity and their insulation performance has decreased. The deformation or leaking is the absolute last step in their situation, when they fail completely.
You will gonna have to replace them all and check all the solderings on the power board.

Posted on Oct 15, 2010

  • Azrael SRL Oct 15, 2010

    The 2 big black round ones(top right) and all the ones with a silver tip and an Y stamped on it - those are the capacitors.
    The controlling IC is the one that is bolted on the radiator at the top left. You should check it using a voltmeter.

  • Azrael SRL Oct 22, 2010

    With a simple voltmeter you will get just a very basic idea if it works, not how well it works: check that it powered (5v) and that the output pins have some output on them - around 3v for an average image.

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You did not tell me whether you have sound or not? Please provide this info so that we can continue troubleshooting.

Sai.

Posted on Oct 14, 2010

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Bad Capacitors on Power Supply Board they will be swollen,vented or puffed up on TOP 2200uf 10v 3300uf 10v 1000uf 16v. Radio Shack should have these caps.

Posted on Oct 14, 2010

  • ladywinn
    ladywinn Oct 14, 2010

    OK,wrongTV ,If its a 98 model you have 2 STK ICs will have PN# on them STK392-110
    Replace Both ICs , use 120s or 150s Check all the low ohm resistors around these ICs
    Mats Electronis sell them 1-800-628-1118 Check Pico Fuses they will look like resistors but they are Green or Yellow 5amp,6amp.7amp Fuses

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