Question about Hitachi 42HDS69 42 in. Plasma Television

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Turns on runs for a second cuts off flashes red

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  • Hitachi Master
  • 5,568 Answers

Your set could have three separate power supplies or they may be combined in a single unit.
One supply is on as soon as the AC cord is plugged in; this one must stay on so the set can respond to a signal from the remote. Another supply (or section) services the majority of the circuits and may have several different voltages produced. Finally, a third section or separate supply produces the high voltage for the plasma display.
The supply that is always on, evidenced by its response to your remote's 'power on' command, is OK.
The high voltage supply may derive its service voltage from the main supply which also supplies the bulk of the circuits and all of the outputs are likely monitored.
The main supply is often the culprit when it fails to start up. This kind of failure is quite common and attributable to the use of cheap capacitors (called 'electrolytic' capacitors) in power supply circuits that are handling higher frequencies that can cause breakdown of the chemicals used in them. They tend to shrink in value and reach a point when their value is no longer high enough to perform as it is required to.
Unless you have some technical skills, I recommend you contact the Hitachi service center nearest you and request the potential cost of replacing the failed power supply board or having yours repaired.
If you really wish to delve into the guts of your set, comment back to this thread and I will guide you in some simple troubleshooting steps.

Posted on Jul 27, 2010

  • 3 more comments 
  • hlynuringi Sep 18, 2010

    Hi Freetek,
    I have the same problem with my Hitachi set. When I try to turn on the set, with remote or button on right side panel, the red indicator light turns green with the audible click and stays green for about a half second. It then turns red again then almost immediately another audible click as the red light turns off (for about a fourth of a second) and then the red light turns on again and the set is back to "standby mode". The whole cycle takes about one second...

    This same problem has actually occurred once before (maybe 12 months ago? ). Then I took the back panel off and vacuumed every speck of dust I saw but the set was reletively clean so I am not sure that was actually the problem. I put the set back to together and it worked fine until now... I would like to know if there is a relatively clear culprit that I could eliminate permanently ? Could you provide troubleshooting ?

    Best regards,

    Could you give me some troubleshooting steps ?

  • Steve Allison
    Steve Allison Sep 19, 2010

    The clicking is caused by a relay that controls AC to the main power supply and it is being released again because of a downstream fault.

    Check my profile for additional troubleshooting tips; there must be many dozens of similar problems and solutions available there covering a broad range of makes and models.

    Generally speaking though, doing detailed troubleshooting isn't practical unless you have some electronics background and at least a multimeter.

    Because of the nature of the majority of the failures, often not more than a cheap electrolytic capacitor, you really need to also have an 'RCL' meter for measuring capacitance and inductance too over fairly large ranges of values.

    What you can do though, is to pull the plug, allow at least hours, or overnight then pull and replace any connectors you see several times.
    Because your problem may be caused by loss of contact rather than component failure.

  • hlynuringi Sep 20, 2010

    Freetek, thank you for your help!
    I actually went ahead and did the same thing as last time, took off the back cover, used a computer cleaning mount on the vacuum cleaner along with a can of compressed air (a little dentist action blow

  • hlynuringi Oct 20, 2010

    Wow - my reply to you was cut short for some reason ? Anywho, the "dust cleaning" thing worked again (maybe just because it allowed for the cooling off or by moving the flat screen around some connectors got connected momentarily that weren't previously connected "enough").

    Suffice to say, this "dust cleaning" worked for about a week and then it did the same thing again and this time nothing worked. So I took it to the repair shop and they said it was a loose/bad/eroded connector on the motherboard. Soddered that ****** up for me and now it works like a charm.

    Oh, and my model is: Hitachi P42A01 plasma flat panel tv

    But thanks again for your help!

  • jcebbar Nov 01, 2010

    Hi there,
    I have the same problem as you - turning off when you turn it on.
    I have a P50X01AU and this is the first time i have experienced such a problem.

    Can you please tell me how much it cost you to fix your set?




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