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SONY 27" Color gone.

Discussion in 'Electronic Repair' started by PaPaPeng, Aug 20, 2004.

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  1. PaPaPeng

    PaPaPeng Guest

    SONY 27" Trinitron model KV27T530

    Images mostly Blue and some Green. Reddish hue in the corners and on
    the onscreen Channel number. Color areas do wander around somewhat.
    Otherwise image is sharp and clear.

    Its a hernia box that I'd rather try to fix myself. I had opened it
    before to fix a jittery upper screen that finally turned out to be a
    cold solder. Its a single PCB and the wiring is so tightly routed
    that there is little room to poke around. That is the PCB has to be
    in its mounting or the cable harness won't reach the connector
    receptacles. Therefore the TV won't function and impossible to tweak
    or measure anything.

    I worked as a computer service tech then as an oilfield
    instrumentation tech. Ages ago I had several night classes in TV and
    VCR repair so I am not entirely clueless. But I have never done TV
    repair as a job to do it with minimum poking around.

    Will appreciate any advice what to look for and fix.
     
  2. David

    David Guest

    Probably a fault in the degauss circuit from description, troubleshoot
    the degauss thermister and related parts.

    David
     
  3. beaudoin

    beaudoin Guest

    I have identical color changes with a KV-27TR10. I have poked at the
    de-gaussing control device and the individual color drivers with negative
    results. I have yet to try de-gaussing. I plan to try it with a soldering
    gun powering a couple coils of #14 and waving it around the face of the CRT.
    Available time is a problem with me. I have the Sam's photofact on it. If
    you succeed, please keep me in mind. Jules Beaudoin
     
  4. Jerry G.

    Jerry G. Guest

    If you have patchy colours in the picture, this is usually caused by a
    failed degassing coil. If the problem occurred after you serviced the set,
    look to see if the degaussing coil became disconnected. It is common that
    the degausser-thermo resistor goes bad in some of these sets.

    --

    Jerry G. GLG Technologies GLG
    ==========================


    SONY 27" Trinitron model KV27T530

    Images mostly Blue and some Green. Reddish hue in the corners and on
    the onscreen Channel number. Color areas do wander around somewhat.
    Otherwise image is sharp and clear.

    Its a hernia box that I'd rather try to fix myself. I had opened it
    before to fix a jittery upper screen that finally turned out to be a
    cold solder. Its a single PCB and the wiring is so tightly routed
    that there is little room to poke around. That is the PCB has to be
    in its mounting or the cable harness won't reach the connector
    receptacles. Therefore the TV won't function and impossible to tweak
    or measure anything.

    I worked as a computer service tech then as an oilfield
    instrumentation tech. Ages ago I had several night classes in TV and
    VCR repair so I am not entirely clueless. But I have never done TV
    repair as a job to do it with minimum poking around.

    Will appreciate any advice what to look for and fix.
     
  5. PaPaPeng

    PaPaPeng Guest


    Thanks for the tip. I haven't got around to servicing it yet. TV
    watching isn't that vital to me.

    The problem happened last week. It was perfect but appeared after I
    fell asleep on the sofa.
     
  6. Art

    Art Guest

    Panasonic and Sony tend to have problems relating to the DGS Thermistor and
    Relay, ocassionally the control circutry to activate the degauss relay. Seen
    many of these with the three pin thermistor that just flippin does not work
    correctly after a few months service.
     
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