Hitachi TV keeps switching itself off

Discussion in 'Electronic Repair' started by John, Oct 14, 2003.

  1. John

    John Guest

    Hi, I have a 4 year-old Hitachi C28W511TN widescreen TV. Recently, and only
    75% of the time, when I switch it on, it turns itself off about a minute
    later.

    Strangely it doesn't make the familiar click and fizz inside the box that I
    hear when I turn it off with the remote, it almost switches the tube off
    'silently' (like a PC monitor going into blank screensaver mode) and there
    appears to be a brief moment just before it does this when it 'thinks about
    it' as the picture rapidly disappears once, then reappears, then switches
    off (I think! - it's all very fast).

    When I press ON on the remote, it doesn't 'click' on, the picture just comes
    back silently without a standard 'I'm turning on' click.

    It then turns off again 30 seconds later!

    I repeat this 2-7 times, then it stays on for the rest of the night until I
    choose to turn it off. It's like it gives up fighting with me and just
    stays on, displaying a perfect picture.

    It's not an IR issue as when I turn off with IR, I hear a click and fizz in
    the box.

    Any ideas? Help much appreciated. I'm tech-savvy and would like to attempt
    a home repair if you can advise a simple part I need to replace.

    John
     
    John, Oct 14, 2003
    #1
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  2. John

    David Guest

    Could be a failing capacitor high in ESR, start by checking electrolytics
    with your ESR meter in critical circuit areas like the power supply, scan
    derived voltages, etc. Also look for failing connections.

    David

    John <> wrote in message
    news:ENYib.4$...
    > Hi, I have a 4 year-old Hitachi C28W511TN widescreen TV. Recently, and

    only
    > 75% of the time, when I switch it on, it turns itself off about a minute
    > later.
    >
    > Strangely it doesn't make the familiar click and fizz inside the box that

    I
    > hear when I turn it off with the remote, it almost switches the tube off
    > 'silently' (like a PC monitor going into blank screensaver mode) and there
    > appears to be a brief moment just before it does this when it 'thinks

    about
    > it' as the picture rapidly disappears once, then reappears, then switches
    > off (I think! - it's all very fast).
    >
    > When I press ON on the remote, it doesn't 'click' on, the picture just

    comes
    > back silently without a standard 'I'm turning on' click.
    >
    > It then turns off again 30 seconds later!
    >
    > I repeat this 2-7 times, then it stays on for the rest of the night until

    I
    > choose to turn it off. It's like it gives up fighting with me and just
    > stays on, displaying a perfect picture.
    >
    > It's not an IR issue as when I turn off with IR, I hear a click and fizz

    in
    > the box.
    >
    > Any ideas? Help much appreciated. I'm tech-savvy and would like to

    attempt
    > a home repair if you can advise a simple part I need to replace.
    >
    > John
    >
    >
    >
     
    David, Oct 15, 2003
    #2
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  3. John

    John Guest

    Hmm, thanks, but I'm not THAT tech savvy! :( Anything simply I could
    replace that would definitely be the cause of this?

    "David" <> wrote in message
    news:...
    > Could be a failing capacitor high in ESR, start by checking electrolytics
    > with your ESR meter in critical circuit areas like the power supply, scan
    > derived voltages, etc. Also look for failing connections.
    >
    > David
    >
    > John <> wrote in message
    > news:ENYib.4$...
    > > Hi, I have a 4 year-old Hitachi C28W511TN widescreen TV. Recently, and

    > only
    > > 75% of the time, when I switch it on, it turns itself off about a minute
    > > later.
    > >
    > > Strangely it doesn't make the familiar click and fizz inside the box

    that
    > I
    > > hear when I turn it off with the remote, it almost switches the tube off
    > > 'silently' (like a PC monitor going into blank screensaver mode) and

    there
    > > appears to be a brief moment just before it does this when it 'thinks

    > about
    > > it' as the picture rapidly disappears once, then reappears, then

    switches
    > > off (I think! - it's all very fast).
    > >
    > > When I press ON on the remote, it doesn't 'click' on, the picture just

    > comes
    > > back silently without a standard 'I'm turning on' click.
    > >
    > > It then turns off again 30 seconds later!
    > >
    > > I repeat this 2-7 times, then it stays on for the rest of the night

    until
    > I
    > > choose to turn it off. It's like it gives up fighting with me and just
    > > stays on, displaying a perfect picture.
    > >
    > > It's not an IR issue as when I turn off with IR, I hear a click and fizz

    > in
    > > the box.
    > >
    > > Any ideas? Help much appreciated. I'm tech-savvy and would like to

    > attempt
    > > a home repair if you can advise a simple part I need to replace.
    > >
    > > John
    > >
    > >
    > >

    >
    >
     
    John, Oct 15, 2003
    #3
  4. John

    Jerry G. Guest

    This can be too complex, and it can be one or several of many parts.
    Usually the capacitors in the power supply and scan circuits can cause this.
    You would have to troubleshoot the set to locate the defective parts. The
    use of an ESR meter will find the bad caps to start with.

    If you are not trained, and equipped to service TV sets, I would suggest you
    call in a service centre that can do a proper safe repair. There are many
    safety issues when servicing TV sets. You can be badly injured, and or cause
    a fire hazard if you don't know what you are doing.

    --

    Greetings,

    Jerry Greenberg GLG Technologies GLG
    =========================================
    WebPage http://www.zoom-one.com
    Electronics http://www.zoom-one.com/electron.htm
    =========================================


    "John" <> wrote in message
    news:1h8jb.7377$...
    Hmm, thanks, but I'm not THAT tech savvy! :( Anything simply I could
    replace that would definitely be the cause of this?

    "David" <> wrote in message
    news:...
    > Could be a failing capacitor high in ESR, start by checking electrolytics
    > with your ESR meter in critical circuit areas like the power supply, scan
    > derived voltages, etc. Also look for failing connections.
    >
    > David
    >
    > John <> wrote in message
    > news:ENYib.4$...
    > > Hi, I have a 4 year-old Hitachi C28W511TN widescreen TV. Recently, and

    > only
    > > 75% of the time, when I switch it on, it turns itself off about a minute
    > > later.
    > >
    > > Strangely it doesn't make the familiar click and fizz inside the box

    that
    > I
    > > hear when I turn it off with the remote, it almost switches the tube off
    > > 'silently' (like a PC monitor going into blank screensaver mode) and

    there
    > > appears to be a brief moment just before it does this when it 'thinks

    > about
    > > it' as the picture rapidly disappears once, then reappears, then

    switches
    > > off (I think! - it's all very fast).
    > >
    > > When I press ON on the remote, it doesn't 'click' on, the picture just

    > comes
    > > back silently without a standard 'I'm turning on' click.
    > >
    > > It then turns off again 30 seconds later!
    > >
    > > I repeat this 2-7 times, then it stays on for the rest of the night

    until
    > I
    > > choose to turn it off. It's like it gives up fighting with me and just
    > > stays on, displaying a perfect picture.
    > >
    > > It's not an IR issue as when I turn off with IR, I hear a click and fizz

    > in
    > > the box.
    > >
    > > Any ideas? Help much appreciated. I'm tech-savvy and would like to

    > attempt
    > > a home repair if you can advise a simple part I need to replace.
    > >
    > > John
    > >
    > >
    > >

    >
    >
     
    Jerry G., Oct 15, 2003
    #4
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