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Old LCD worth repairing?

Discussion in 'Electronic Repair' started by Chas, Mar 14, 2012.

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  1. Chas

    Chas Guest

    My 32" Polaroid LCD tv just got the black screen. Sound is good and channel
    changing works...just the video...It is pretty old as it cost over $900 when
    I got it, so that dates it 12 plus years I would think.
    .. . .It had a wonderful screen and although I have already replaced it with
    a 32" Emerson, I am wondering if the Polaroid would be worth investing $$$$
    in, that is if one can find a tech here in SW. Montana. any imput
    please...chas.
     
  2. The first thing is to figure out what's wrong, then how much it will cost to
    fix it. You can then make a value judgment.

    The once-proud Polaroid name (there was a time when Polaroid held the
    position -- "maker of magic" -- Apple now does) has been attached to many
    indifferent products. It's unlikely you'll be able to get parts.
     
  3. Guest

    If you have to take it to a tech it's probably not worth repairing.
    While Polaroid was well known for their instant cameras, their TVs
    were noteworthy only for low quality and lack of service support.
    Your estimate as to it's age is off by a factor of 2, I'd say. The
    Polaroids were dumped on the market in the 2006 - 2009 time frame.
    The Emerson you replaced it with is cut from the same cloth.

    There are several tests I suggest for the 'no picture' problem.

    1. In a completely dark room, is there any light visible from the
    screen when it is turned on? This may be mst noticeable around the
    edges of the screen. If so, does it flash briefly, or does it stay
    on?

    2. Again, in a completely dark room, is there any light visible
    from the back of the set when it is turned on? Again, if so does it
    stay on or only flash briefly?

    3. With the TV on and receiving a signal, can you see an image if you
    shine a bright light at an angle onto the screen?

    These TVs are notorious for an inverter failure. This may be either a
    bad transformer, which will result in a brief flash before the
    protection crcuit shuts the inverter down; or an open fuse, in which
    case you will not see any signs of light.

    If you do see a faint glow from the screen, but no picture, you may
    have a tcon failure. Search for the TV model number on eBay to see if
    they are available.

    If you can see an image with the bight light you have confirmed it is
    either an inverter, CCFL, or possibly a power supply fault. Another
    common problem with these sets are bad capacitors in the power supply.
    A complete set of caps will cost $15-$20 from Digi-Key if you are in
    the USA.

    PlainBill
     
  4. Sometimes a bad fuse link on the T-conn board.

    Mark Z.
     
  5. Chas

    Chas Guest

    Bill,
    . . .thanks for your insight.
    The first indication of a problem was the screen darkened while being
    watched. I shut it off and a few minutes. Later I turned it on and had the
    pic back, but only for a short time (like -2 mins?). Off again. On again
    and the same...pic but soon lost. Off again...this time on restart there
    was no pic but there were colored vertical 2" bands on each side of the
    screen framing a black center band. After that, no pic at all but the black
    screen with just a touch of light around the edges...very small almost
    pencil line thin light highlights.
    The symtoms made me consider putting a fan behind the TV to cool it.
    .. . .I checked my dish for snow (we are getting hammered) and it was clear.
    My malfucntion is not like a common snow blocked dish anyway. No lost signal
    msg.
    .. . .Incidentally, my old Polaroid weights probably 2.5 X the Emerson.
    ...................again. . thanks chas.
    ************************************************************
     
  6. Guest

    Those symptoms point squarely toward a problem with the tcon.
    Typically those will run in the $20 to $50 range. Certainly the
    inverter and backlights are eliiminated as a cause.

    One piece of information that helps a great deal is the model number
    of the TV. Polaroid made more than half a dozen 32" LCD TVs.

    PlainBill
     
  7. Chas

    Chas Guest

    Bill, a private email to you was blocked so I ask more help here.

    Bill,
    It was manufactured Apr 2006. Newer than I thought.
    Model # 3200.
    Product # FLM323B.
    Dist. by Petter Consumers Brands, . . .Minne.
    .. . . .
    Bill, is the 'tcon' a transformer or inverter type assembly? I could
    replace that by myself, if I had an address where to get one online.
    Sure would help to have a hint as to what it may look like and where it
    possibly may 'live.
    Sure appreciate your support.. . .chas
    ******************************************************
     
  8. Guest

    Chas,

    The tcon (timing and control) is a circuit board. It takes the
    video information from the main board, translates it into X, Y and
    intensity information and drives the appropriate pixels at the proper
    brightness. If you look at the main board of the TV you will probably
    see a shielded cable disappearing under a cover at the top of the
    panel. The tcon is behind the panel.

    The manufacturer of an LCD panel will include the tcon and backlights
    as part of the assembly. And there lies the problem. One popular
    source for parts like this is 'ShopJimmy'. They list three different
    tcons for this TV; searching eBay for 'FLM323B tcon' brings up
    pictures of three different tcons. Prices range from $10 to over $50,
    but be careful, a tcon for a CMO panel will not work with an AUO
    panel.

    Your task will be to take the back off the set, attempt to locate
    the tcon, and identify which tcon you have.....

    My email address is disguised. A little thought should allow you to
    discern the real name of the host. Certainly the [email protected]%%@ spammers can.

    PlainBill
     
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