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Sony KV-32TS20 Tuner Problem?

Discussion in 'Electronic Repair' started by [email protected], Mar 26, 2006.

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  1. Guest

    Experts,

    I have a sony KV-32TS20, which has worked fine for several years.
    Of late, it has developed some symptoms

    1. On startp all channels are just snow, and no audio, just
    disturbance.
    2. After about 5-10 mins, the picture and audio kick in, and everything
    is fine.

    It worked like this for a few months. Now, the audio and picture do not
    kick in at all, and the TV often shuts itself off.

    I have seen several posts on this NG about bad solder joints. I have
    removed the A board from the TV, but am not sure where to look for bad
    solders. Several years back I had lost audio on the TV and had to
    replace the small board piggybacked on the A board. Could this new
    problem be related in the same area?

    Any and all help appreciated on this matter.

    Regards,

    Raj.
     
  2. Jerry G.

    Jerry G. Guest

    This is a very old set. I have not worked on one for many years.

    I have had some cold solder connections in the AFC and AGC circuits in
    this set. This is going by your fault description. The AFC and AGC
    circuits are mainly in the IF module.

    On occasion in some Sony models, I have had some component failures in
    the AGC circuit that is on the main circuit board. In some models there
    is an additional stage on the main board. The main part is in the IF
    module.

    When soldering in the IF and tuner sections, the effects of working on
    them can cause mistuning. To re-alighn these, you will need the proper
    calibration setup, and the information for it. When I've had big
    problems in these areas, I generaly changed the tuner or IF modules, as
    necessary to fix the fault.

    To perform any detailed work in this set, you will meed tp purchase the
    service manual. You will also need the means to follow it up.


    Jerry G.
     
  3. Guest

    Jerry,

    Thank you for an informative response.Not being too familiar with
    the electronics of TVs, is the AFC and AGC circuitery located in the
    "Jungle" section of the A-Board? I have the Sams service manual, but am
    not sure where to find the details for the AFC and AGC. Any additional
    information greatly appreciated.

    Thx,

    Raj.
     
  4. Andy Cuffe

    Andy Cuffe Guest


    There should be a metal box next to the tuner that contains the IF and
    AFC circuit. Usually the bad soldering is on one or more of the coils
    in that box. You'll have to remove the box from the board to get
    inside it.
    Andy Cuffe

     
  5. bjeasleysr

    bjeasleysr Guest

    Need help with a really strange problem. Watching program in ENGLISH and
    taping on VCR at the same time. Playback VCR and get Spanish broadcast. Both
    TV and VCR are Sony products. VCR is a Combo VCR/DVD unit.

    Please reply to my e-mail


    Thanks
     
  6. Guest

    Set vcr second audio program mode correctly, see owners manual for dvd
    vcr.

    Sounds like the vcr tuner is set to SAP mode, needs to be on standard
    or stereo mode.
     
  7. Guest

    Andy,

    Thanks for your response. I am a little confused on where exactly
    the tuner is. The main mother board has a silver box soldered on it.
    This box connects to the co-axial cable via a banana like connector. Is
    this the tuner?

    The mother board also has three vertical boards mounted on it. One
    of them is the "A board", which has two silver boxes on it too. Are one
    of htese boxes the tuner?

    Pulling out the vertically mounted "A Board" is simple, but I am
    not quite sure how to dismantle the whole mother board. If the tuner is
    mounted on the mother board and not on the vertical "A Board", I will
    have to figure out a way to dismantle the mother board.

    Regards,

    Raj.
     
  8. JANA

    JANA Guest

    If your TV is worth anything to you, after reading your response, I would
    strongly suggest you call a service centre that services Sony TV sets.

    If you start messing around in the tuner and IF sections of your set, there
    is a very strong possibility that you will most likely increasing the cost
    of the final repair, rather than saving anything at all. There are a lot of
    critical components involved in the tuner and front end. Disturbing them,
    can effect the calibration of the signal path. To work in the tuner and IF
    sections, the modules will have to be unsoldered from the main circuit
    board, to gain access to their internal circuit board, if any soldering is
    to be done. If there are any defects in these modules that is more than
    something simple, they are normally changed rather than serviced.

    These sets can get rather complex to service, require a lot of experience,
    training, having access to the proper service information, tools, and
    instrumentation.

    There are also some serious safety issues when working in TV sets.

    --

    JANA
    _____


    Andy,

    Thanks for your response. I am a little confused on where exactly
    the tuner is. The main mother board has a silver box soldered on it.
    This box connects to the co-axial cable via a banana like connector. Is
    this the tuner?

    The mother board also has three vertical boards mounted on it. One
    of them is the "A board", which has two silver boxes on it too. Are one
    of htese boxes the tuner?

    Pulling out the vertically mounted "A Board" is simple, but I am
    not quite sure how to dismantle the whole mother board. If the tuner is
    mounted on the mother board and not on the vertical "A Board", I will
    have to figure out a way to dismantle the mother board.

    Regards,

    Raj.
     
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