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  1. Member
    Join Date
    Aug 2019
    Location
    Cordoba, Argentina
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    Hi people! Ofesad here from Argentina!

    Recently I got this transcoder, got it for 10usd, tested the composite output and works fine.
    Brand it's "TVX television Experts" and in the back as a "made in USA" stamp.

    If feature bars generator, Svideo in/out, transcode and a procamp.
    Image
    [Attachment 58387 - Click to enlarge]


    I tested the composite output and it works like a charm, however the Svideo seems to have some issues.

    At the beginning I has having issues (noise) in the whites.
    Image
    [Attachment 58388 - Click to enlarge]

    (mostly when using a 25ft svideo cable)
    This was solved by increasing a trim pot in the main board, probably gain?


    However the issue that remains is in the top some sort of flickering. The same happens on any cable.

    Video:
    https://drive.google.com/file/d/1m_QNFplt3RikFTgYgc9X5wFGn8h2fuwb/view?usp=sharing

    I already changed the only electrolitic cap on the main board, didnt have any effect.

    Here some pics to see it:
    MAIN BOARD
    Image
    [Attachment 58389 - Click to enlarge]


    FIFO
    Image
    [Attachment 58390 - Click to enlarge]


    Image
    [Attachment 58391 - Click to enlarge]


    Image
    [Attachment 58392 - Click to enlarge]


    Image
    [Attachment 58393 - Click to enlarge]


    BTW some IC's have been sanded. The old practices so you cant know what they are.

    Capture was made with a brand new Hauppauge USB-Live2 using Virtualdub2.

    Any ideas are welcome!

    Also, if anyone had or has this transcoder and has the manual, would be kind enough to scan it and upload it? I haven't found any information on this device whatsoever.

    Thank you for reading!.

    Ofesad
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  2. Originally Posted by ofesad View Post
    The same happens on any cable.
    Even a short (6ft or less) cable?
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  3. Member
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    Aug 2019
    Location
    Cordoba, Argentina
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    Originally Posted by jagabo View Post
    Originally Posted by ofesad View Post
    The same happens on any cable.
    Even a short (6ft or less) cable?
    Yeah, even short cable (new old stock).
    Try'd different ones and the problem remains.

    I was thinking to change the svideo connector on the transcoder... I already clean it with isopropyl and contact cleaner. No difference.

    Maybe the caps on the psu? but it delivers 4.99 ~ 4.98v quite stable.
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