Question about Sony FD Trinitron WEGA KV-32FS120 32" TV

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Sony TV KV-X2973E uk model: no sound in SCART or AV1, AV2.

Hello!
I have this sony crt TV model KV-X2973E whitch first, had sync and sound problems (picture sliding horizontaly and sound going loud out of control after some 20 or 30 mins of warming up.). I changed IC 304 and, to make sure IC 201 (CXA-1855s and TDA6612). After that all seemed OK, but after some 10 mins or so, sound faded and went silent. Searching on the net I found the cure were it was said to change R627 (on audio PS board). Now everything is OK but when I connect the VCR or Satellite or AV camcorder there is no sound. I haven´t either audio out on the scart from the external sources. I checked the power suplies. +22V -22V +9V all seem ok. No blinks on the LED´s. I have no ideia where to search to cure this problem. I hope someone will kindly suggest a psssible solution. Thanks in advance for your help. Answers to: arturduque@hotmail.com
Ple

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  • ticotur Aug 16, 2008

    Yes, I downloaded the diagrams.
    I´m a retired electronics service engineer, (Scientific and medical equipement). but no oscilloscope. Thanks for your help
    Ticotur


  • ticotur Aug 16, 2008

    Hi Welcomegee!
    Thanks for your fast and kind help. I got the manual fromhttp://www.free-service-manuals.com.
    Set is around 11 years old and wish to give it away.
    I´m following your suggestion through the mute circuit. In TV reception the mute and sound are working perfect.

    I guess I have to get a scope and trace the audio external source.
    Thanks
    Ticotur



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Do you have its schematics or service manual? This kind of problem needs detailed schematic diagrams of related product. Let me know, are you Tech-Person or TV-Repairman?

Posted on Aug 15, 2008

  • Shahid Electronics
    Shahid Electronics Aug 16, 2008

    Thanks for response and nice to know you as engineer. Though I don't have info for UK models in my PC yet I would try some tips or hints.

    There would be Audio Mute command comes from System Control IC, please locate it in schematics and temporally disable it by some sort of open circuit ( remove resistor ).

    If your TV is around 5-6 years old, then it has IF Module near RF Tuner. check this IF Box as its responsible for demodulated audio.

    Your might has defective Source Selector IC i.e RF / A-V1 / A-V2 selection.

    Hope these info would help you.

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