Connect with us

Problems with a TDA3565 PAL decoder

Discussion in 'Electronic Repair' started by J.Oppermann, Apr 28, 2004.

Scroll to continue with content
  1. J.Oppermann

    J.Oppermann Guest

    Perhaps anybody has some experience with the "older" TDA3565.
    I have the datasheet, but that's a bit too brief for me as I happen to have not
    too much experience with TV-Electronics.

    In the "S-Video to RGB Converter" where the IC is used the TDA3565 gives no RGB
    output anymore. Only about 1.5V DC on Red. It gets quickly quite hot (about
    50-60°C I'd estimate) even though the datasheet says sth about 1W power
    consumption, it makes me considering a damaged IC...

    The adjustment voltage on pin 6 (contrast - actually 1-4V) is pulled down to
    about 0.5V. I was wondering if this might indicate a damage of the IC, or a
    feature that might be some kind of output protection.

    Before the RGB output "vanished" I got a very dark picture (voltage on pin 6 was
    already "pulled down").

    Funny enough, as I disconnected the poti from pin 6 to check if it was providing
    the correct voltages (i.e. 1-4V) - which it does. Suddenly the input on pin 5
    (saturation) pulled the voltage down to 0.5V instead.

    maybe somebody can give me some advice?
    TIA Jo'
     
  2. Jerry G.

    Jerry G. Guest

    Change the IC to check it!

    --

    Greetings,

    Jerry Greenberg GLG Technologies GLG
    =========================================
    WebPage http://www.zoom-one.com
    Electronics http://www.zoom-one.com/electron.htm
    =========================================


    Perhaps anybody has some experience with the "older" TDA3565.
    I have the datasheet, but that's a bit too brief for me as I happen to have
    not
    too much experience with TV-Electronics.

    In the "S-Video to RGB Converter" where the IC is used the TDA3565 gives no
    RGB
    output anymore. Only about 1.5V DC on Red. It gets quickly quite hot (about
    50-60°C I'd estimate) even though the datasheet says sth about 1W power
    consumption, it makes me considering a damaged IC...

    The adjustment voltage on pin 6 (contrast - actually 1-4V) is pulled down to
    about 0.5V. I was wondering if this might indicate a damage of the IC, or a
    feature that might be some kind of output protection.

    Before the RGB output "vanished" I got a very dark picture (voltage on pin 6
    was
    already "pulled down").

    Funny enough, as I disconnected the poti from pin 6 to check if it was
    providing
    the correct voltages (i.e. 1-4V) - which it does. Suddenly the input on pin
    5
    (saturation) pulled the voltage down to 0.5V instead.

    maybe somebody can give me some advice?
    TIA Jo'
     
  3. Andre

    Andre Guest

    Its probably fried. I have a few spares, so E-mail me if you want one
    (pulls from dead boards)

    -A
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-