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Faulty LCD TV

Discussion in 'Electronic Repair' started by Ian N, Sep 8, 2005.

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  1. Ian N

    Ian N Guest

    Probably a long shot, but ...

    My parents have a Samsung LCD 17" TV (model LCDLW17N13W). Had it for around
    a year and only used about 10 times in total.

    At the weekend when the kids came round they had a PS2 plugged in (via
    scart) for a couple of hours while playing games. After that someone
    switched off the TV but left the PS2 switched on and connected over-night.

    Next morning when they tried to switch on the TV they found it was not
    working.

    When it is plugged in, the power LED comes on for a couple of seconds
    followed by the normal 'start-up' beeps, then the power LED goes out. After
    a few seconds the sequence repeats ad infinitum. The display never actually
    comes on - the TV just seems to perform a start-up test then resets every
    time.

    Has anyone come across this model of TV before? Are there any known faults?
    Is it possible that the PS2 being left plugged in has caused the problem?

    As the TV is out of warranty now they will probably have to pay to have it
    fixed. I'm just trying to get an idea of the likely cause of the fault if
    possible.

    Cheers,
    Ian.
     
  2. JANA

    JANA Guest

    This sounds like a failure in the power supply section, or there is a short
    on one of the boards, thus over-loading the supply. Without proper
    diagnostics, it is impossible to guess. The service rep will fix the set by
    swapping out the defective board(s).

    The failure has nothing to do with anything connected to the set, unless
    what is connected has a serious defect. These sets can fail on their own
    from use and age.

    --

    JANA
    _____


    Probably a long shot, but ...

    My parents have a Samsung LCD 17" TV (model LCDLW17N13W). Had it for around
    a year and only used about 10 times in total.

    At the weekend when the kids came round they had a PS2 plugged in (via
    scart) for a couple of hours while playing games. After that someone
    switched off the TV but left the PS2 switched on and connected over-night.

    Next morning when they tried to switch on the TV they found it was not
    working.

    When it is plugged in, the power LED comes on for a couple of seconds
    followed by the normal 'start-up' beeps, then the power LED goes out. After
    a few seconds the sequence repeats ad infinitum. The display never actually
    comes on - the TV just seems to perform a start-up test then resets every
    time.

    Has anyone come across this model of TV before? Are there any known faults?
    Is it possible that the PS2 being left plugged in has caused the problem?

    As the TV is out of warranty now they will probably have to pay to have it
    fixed. I'm just trying to get an idea of the likely cause of the fault if
    possible.

    Cheers,
    Ian.
     
  3. Guest

    Does the set have any kind of parental lock-out feature? Or maybe a
    PAL/SECAM/NTSC switch? The kids may have fooled with the set and turned
    on the lockout or set it to the wrong video standard. The way to reset
    it may be in the owner's manual. Or maybe it's as simple as they turned
    the brightness all the way down. Most sets will go to some minimum
    brightness picture instead of going completely dark, but I guess having
    it go dark might be a "feature" enabling you to listen to the TV audio
    without running the LCD if you're in the next room or something.

    If it has any pushbuttons on the set itself, you might make sure that
    they all operate freely. A stuck-down button might be confusing the
    set. Find the remote and remove the batteries from it - maybe the kids
    spilled soda in the remote and the "power" button on the remote is
    shorted, causing it to run continuously and shut off the TV as soon as
    you turn it on at the set.

    This may not help, but it's free to try: unplug the set from the mains
    and disconnect _everything_ connected to it - antenna, cable TV, PS2,
    headphones, stereo, whatever. Leave it disconnected from the mains for
    half an hour or so, then plug it back in and try again. If the
    microprocessor got confused, this may reset it. If it works after this
    treatment, add back the things you disconnected one by one to see which
    one makes the TV fail. If it doesn't work after this treatment, your
    problems are probably more expensive.
    It's possible, but unlikely. Any decent TV set should be able to stand
    having its A/V or SCART inputs driven while shut off.

    Matt Roberds
     
  4. Andy Cuffe

    Andy Cuffe Guest

    Try shining a bright light on the screen when you turn it on. Look
    for any sign of the picture. If you can see a faint picture under
    bright light, the LCD's back light isn't working. Problems with the
    back light power supply are very common with LCD TVs and monitors.
    Most will shut down when the back light doesn't turn on.
    Andy Cuffe

    <-- Use this address until 12/31/2005

    <-- Use this address after 12/31/2005
     
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