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Sony Trinitron KV-32LS35V CRT Dying ?

Discussion in 'Electronic Repair' started by Derek ^, Oct 15, 2006.

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  1. Derek ^

    Derek ^ Guest

    This UK model TV is nearly 4 years old has been heavily used and has
    the following fault.

    When switched on from cold the picture is very dark, the highlights
    appear to be crushed and "silvery", the colour balance is wrong with
    low level flesh tones (under the chin, say) taking on a magenta cast.

    This effect warms out quite rapidly within 5 or so minutes, and if the
    contrast is not run too high the picture is more/less normal for the
    rest of the day but highlights can still look a bit silvery and
    coloured yellowish. The problem appears to be getting worse.

    The set was bought with a "free" 5 year extended warranty *but* the
    retailer, Allders, no longer exists. In the UK I can make a claim
    against the finance company who provided the credit to buy the set,
    thankfully they still exist. But there is only one year left on the
    Ex. Warranty and I might have quite a lot of argueing to do with them.

    I am thinking the CRT has one or more low emission guns and the repair
    will be expensive/uneconomical. I don't want them to start a long
    backwards and forwards sequence of repair visits 'till the warranty
    expires.

    Forewarned is forearmed. ;-)

    TIA for any opinions.

    DG
     
  2. Meat Plow

    Meat Plow Guest

    Leave it on 24/7 and hope it fails.
     
  3. David Naylor

    David Naylor Guest

    they will most likely tell you to take it to a shop and the shop will or
    should give an estimate to the xredit company and they WILL rfusee to
    repair it and let you get a new set. at least thats the way mu shop does it
     
  4. Guest

    This is indeed falling CRT emission. I'd aim firmly for a replacement
    set, as although it could be fixed it would not last, and a CRT is not
    in any way economical to replace. Emission must have fallen quite badly
    to get to this point, and it will only deteriorate if not replaced.


    NT
     
  5. JANA

    JANA Guest

    Your description sounds like a CRT that has been failing for a while. Most
    of these CRT's are no longer available. If so, the cost would not be
    feasible. In these cases, most of the warranty contractors will give what is
    called a pro-rated rebate for an exchange.

    Read your warranty contract very carefully to know the agreement that is
    stated on it. This way, you will be in a legal position to argue for a full
    credit, if the contract indicates full exchange, which I doubt after the
    first year.

    --

    JANA
    _____


    This UK model TV is nearly 4 years old has been heavily used and has
    the following fault.

    When switched on from cold the picture is very dark, the highlights
    appear to be crushed and "silvery", the colour balance is wrong with
    low level flesh tones (under the chin, say) taking on a magenta cast.

    This effect warms out quite rapidly within 5 or so minutes, and if the
    contrast is not run too high the picture is more/less normal for the
    rest of the day but highlights can still look a bit silvery and
    coloured yellowish. The problem appears to be getting worse.

    The set was bought with a "free" 5 year extended warranty *but* the
    retailer, Allders, no longer exists. In the UK I can make a claim
    against the finance company who provided the credit to buy the set,
    thankfully they still exist. But there is only one year left on the
    Ex. Warranty and I might have quite a lot of argueing to do with them.

    I am thinking the CRT has one or more low emission guns and the repair
    will be expensive/uneconomical. I don't want them to start a long
    backwards and forwards sequence of repair visits 'till the warranty
    expires.

    Forewarned is forearmed. ;-)

    TIA for any opinions.

    DG
     
  6. Guest

    This is a classic picture tube failure, I've seen it as many as 50
    years ago on B+W sets. The silver shimmering is exactly the way to
    describe it. There is no way to do anything except replace the picture
    tube or buy another set.

    H. R. Hofmann
     
  7. Guest

    I guess the silvery effect is due to the effect of the electron cloud,
    which makes continuous electron output well below peak output. White
    edges are represented ok, but once that e- cloud is depleted the gun
    can only supply a rather lower output, thus highlight areas become grey
    while white edges are white.

    There are 3 simple means of repairing this. The issue is how long it
    would last on a tube thats reached this bad a condition in just 4
    years, ie is going down quite fast.


    NT
     
  8. Colin

    Colin Guest

    I would certainly refuse a repair! I agree that your CRT is as good as
    dead but if there is only a short time to go before the warranty expires
    some repair shops may decide to rejuvinate the tube instead of replacing
    it. The result will be a very good picture - for a short time. Check your
    warranty agreement and if possible insist on a new tube verified in
    writing, or a replacement set. Be aware though, that some policies
    guarantee the tube for 12 months only but the rest of the set can be
    longer. Watch out for this.
    Regards,
    Colin
     
  9. Guest

    I just presumed the end user would have no legal right to such, and
    would thus be taking a chance as to what the supplier decided to do.

    If all they offered was a tube rejuv, I'd say no, having nothing is
    better than doing that. The problem with rejuvenators is they make the
    tube smear badly when it saturates, meaning that as the emission goes
    down again, which it soon will, instead of just getting wonky or so-so
    colour, you get real bad picture smearing, and your set gets an early
    death as no-one would want to watch it like that.

    If OTOH you get nothing done, voltage boosting can keep old tubes going
    for years. I did some very aggressive boosting on a Sony set in much
    worse shape than yours, and it was still ok years down the line. I got
    it so bad that nothing could be seen on the screen at all, and I
    boosted it so hard I didnt dare give it to anyone else. IIRC +70%
    heater, +10% EHT. Whoever had it before must have had very good night
    vision :)


    NT
     
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