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Sony KV-35V45 CRT Short, i'm clueless now..

Discussion in 'Electronic Repair' started by cheebster, Aug 26, 2007.

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  1. cheebster

    cheebster Guest

    Hi Folks. I'm posting here as a last resort, i've spent more time on
    this tv it ever worths, but money isn't the point more that i wouldn't
    give up. I hate spending time on something and give up on it at the
    end argh.

    Ok here's my issue, i have a 1996 Sony KV-35V45 CRT, some friend gave
    it to me. At first, tv was Greenish and flashing on and off. Also,
    when set on tuner, image was kinda pinkish instead of white and black.
    So i read a bit online, and it seems i've got a green Cathode (KG) to
    Heater short.

    After checking the voltages, i've found the KG signal on the crt neck
    jumped from 109 to 209V. The other ones were stable. Some guy on
    another forum tells me, that it's KG to K shorted.

    First thing ive tried, after reading, was to tap on the crt neck. It
    worked a few times.. for max an hour. Sometime i tapped on it a few
    times, had a nice spark, image got clean and nice... But it never
    lasted.

    So i went and found a CRT rejuvenator, made myself an unversal adapter
    for it with the proper signals. It's a B&K model 467 rejuvenator. It
    was unable to clear the short on it. But after giving it a shot, the
    TV was much better, having a black background instead of the greenish
    one i've used to have. For a few minutes.. a spark occured in the CRT
    neck again, and back to square one.

    So then i read that if i put the tv on it's front and tap on the neck
    with CRT board removed, i can clear the particles out and that might
    do it. Did that, and now the TV wont get outta standby, and i don't
    see the heater glowing up (?) anymore, even with CRT rejuvenator
    hooked up. It's like knocking on the CRT neck pushed the short even
    worst..

    Even the 'restore' more of the rejuvenator wont show any activity when
    i push on any of the 3 color guns button. It used to do before i did
    the tap on the neck thing.

    If anyone could clearly tell me what happened, and if i can do
    something, i'd really appreciate it. Else, i'm giving that tv a trip
    to the dumpster, but i'd seriously hate to. I have no tv repair
    experience, i'm learning with that one (ok i'm a little late, but i
    guess it'd serve me for something else someday).

    Thanks in advance, Vincent.
     
  2. Ken G.

    Ken G. Guest

    It sounds like the filaments burned out in the tube or one of the
    filament pins sticking out of the tube pulled loose and came unconnected
    ..
     
  3. cheebster

    cheebster Guest

    Well, i can still see a 4 OHM resistance on the heater pins, would
    that change if one of the filament pins had came loose ? Thanks.
     
  4. cheebster

    cheebster Guest

    Oh well, you was right. I didn't check well it seems the first time. I
    can SEE one of the 2 filament pins at the very end of the tube where
    the pins are, the metal there is broken and disconnected. No
    continuity there anymore. I've broken the heater connection. Time for
    junk i guess ! That's a sealed part, is it ? Thanks.
     
  5. James Sweet

    James Sweet Guest


    Yep, the entire CRT is one piece of glass with a hard vacuum in it. Those
    35" Trinitron tubes are notorious for failing, the 27s are much more
    dependable.
     
  6. cheebster

    cheebster Guest

    James, i'm looking in the ads here for used tv's, and some folk sells
    a 27 incher XBR sony, dating 1997 (mine was 1996). He's asking 100$
    canadian bucks for it. Is it a good buy, less chances that one would
    fail like the 35 inch one ? I could do a clean/balance on it using my
    rejuvenator even to give it a cleaner picture, was wondering if it was
    a good idea also. Would appreciate any input, thanks again !
     
  7. Hi!
    See the set in person and running before you make any committment to buying
    it. Ask if the seller will accept an offer on it. To me, $100 is a bit hard
    to justify spending on a ten year old TV...even if it is a Sony. Try to find
    out how much it has been watched--a set that wasn't watched excessively or
    left on for all hours of the day and night would be better than one which
    was used heavily.

    If the picture is good, I'd be inclined to leave the tube alone and not play
    with it too much. I seem to remember hearing that CRT rejuvenators are hard
    on picture tubes.

    William
     
  8. James Sweet

    James Sweet Guest

    James, i'm looking in the ads here for used tv's, and some folk sells
    a 27 incher XBR sony, dating 1997 (mine was 1996). He's asking 100$
    canadian bucks for it. Is it a good buy, less chances that one would
    fail like the 35 inch one ? I could do a clean/balance on it using my
    rejuvenator even to give it a cleaner picture, was wondering if it was
    a good idea also. Would appreciate any input, thanks again !



    Those are good sets, but that seems a bit high in price given analog is
    being phased out. Don't rejuve the tube unless it needs it, Sony CRTs don't
    tend to respond well to that, and any tube can be made much worse.

    Too bad you're not near Seattle, I have a 27" Sony in excellent cosmetic
    condition with some sort of electronic problem (not the tube but I haven't
    looked into it) sitting in my garage you could have for free, I'm tired of
    tripping over it and will never get around to fixing it I've decided.
     
  9. JANA

    JANA Guest

    Your set needs a new picture tube. There is "no other solution". After all
    the fooling around with it, it is possible that some of the drive components
    on the CRT board are also damaged. When I have had shorts in the CRT,
    sometimes there has been damage on the CRT board.

    It's time to retire the set, and get a new one!

    --

    JANA
    _____


    Hi Folks. I'm posting here as a last resort, i've spent more time on
    this tv it ever worths, but money isn't the point more that i wouldn't
    give up. I hate spending time on something and give up on it at the
    end argh.

    Ok here's my issue, i have a 1996 Sony KV-35V45 CRT, some friend gave
    it to me. At first, tv was Greenish and flashing on and off. Also,
    when set on tuner, image was kinda pinkish instead of white and black.
    So i read a bit online, and it seems i've got a green Cathode (KG) to
    Heater short.

    After checking the voltages, i've found the KG signal on the crt neck
    jumped from 109 to 209V. The other ones were stable. Some guy on
    another forum tells me, that it's KG to K shorted.

    First thing ive tried, after reading, was to tap on the crt neck. It
    worked a few times.. for max an hour. Sometime i tapped on it a few
    times, had a nice spark, image got clean and nice... But it never
    lasted.

    So i went and found a CRT rejuvenator, made myself an unversal adapter
    for it with the proper signals. It's a B&K model 467 rejuvenator. It
    was unable to clear the short on it. But after giving it a shot, the
    TV was much better, having a black background instead of the greenish
    one i've used to have. For a few minutes.. a spark occured in the CRT
    neck again, and back to square one.

    So then i read that if i put the tv on it's front and tap on the neck
    with CRT board removed, i can clear the particles out and that might
    do it. Did that, and now the TV wont get outta standby, and i don't
    see the heater glowing up (?) anymore, even with CRT rejuvenator
    hooked up. It's like knocking on the CRT neck pushed the short even
    worst..

    Even the 'restore' more of the rejuvenator wont show any activity when
    i push on any of the 3 color guns button. It used to do before i did
    the tap on the neck thing.

    If anyone could clearly tell me what happened, and if i can do
    something, i'd really appreciate it. Else, i'm giving that tv a trip
    to the dumpster, but i'd seriously hate to. I have no tv repair
    experience, i'm learning with that one (ok i'm a little late, but i
    guess it'd serve me for something else someday).

    Thanks in advance, Vincent.
     
  10. JANA

    JANA Guest

    I would not go near an old set like that even if I got it for free! Over
    here with our new pollution and environment laws, it can cost $100+ to get
    rid of an old TV set! If you buy it, you will be doing the man a favour.
    The $100 can be a nice deposit for a discent LCD TV that comes with a
    warranty, and it will give you a number of years of good service and
    enjoyment!

    --

    JANA
    _____


    James, i'm looking in the ads here for used tv's, and some folk sells
    a 27 incher XBR sony, dating 1997 (mine was 1996). He's asking 100$
    canadian bucks for it. Is it a good buy, less chances that one would
    fail like the 35 inch one ? I could do a clean/balance on it using my
    rejuvenator even to give it a cleaner picture, was wondering if it was
    a good idea also. Would appreciate any input, thanks again !
     
  11. James Sweet

    James Sweet Guest


    Over where? It's 15 bucks to dispose of an old TV here, some of us still
    prefer a good CRT over an LCD TV, I'd take a 27" Sony over any standard def
    flat panel.
     
  12. cheebster

    cheebster Guest

    On a side note, anyone knows how are Sanyo TV's ? Some local dude
    wants 30$ for a 32'' Sanyo TV, only having the coax input to be
    resoldered. I wonder how Sanyo tubes hold against the latest POS
    sony's ?

    Thanks, Vincent.
     
  13. b

    b Guest

    I recently acquired a Sanyo CE29FFV1 tv (chassis 2114 eb5-c). I was
    contacted by a lady who said that another tech had said the tube was
    duff on their 28" Sanyo and since I was a local tech, would I like it
    free, for parts? I called round, and was expecting some knackered old
    thing, lo and behold its a pureflat screen, very recent model. They
    had the contrast and sharpness set wrongly and changing that was all
    that was required. I think it was just an excuse to get a new plasma
    set or something, as I fail to see why else anyone would toss a set
    that good.

    that sanyo has been in my lounge for about a month now giving
    absolutely no probs and a nice sharp pic. ;-)

    In response to your query, provided the set is not a 100hz model , go
    for it. The sanyo's I have had in for repair made within the last 9 or
    so years have been pretty good sets. I hated their early-mid 90s stuff
    though.

    -B.
     
  14. cheebster

    cheebster Guest

    Hi there. Thanks for the input. I picked it up tonight, 30$. Set is a
    sanyo AVM-3156U. It looks much cheaper than the sony inside, smaller
    boards, less components and such. Problem was the composite input
    grounds were floating around, cracked solder there. 4 points to fix,
    tv works now.

    I'm just wondering if that small speaker there gives some kinda sound.
    Maybe i could take the speakers off the sony one and put 'em in that
    one hehe

    Oh well. Thanks, Vincent.
     
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