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No Color on My Sony trinitron tv

Discussion in 'Electronic Repair' started by [email protected], Jul 11, 2006.

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  1. Guest

    Hello there,

    I'm hoping you guys can help me with my tv query,

    I just bought a second hand sony Trinitron tv and when I brought it
    back home the color had gone and it only showed perfect black and white
    images.

    from various threads from the net, it seems the fault could be with the
    chroma chip/circuit.

    Now can you please tell me where i can find such part inside my tv? The
    idea is to prod around the chroma chip with an insulated tool to see if
    I can make the color come and go.

    Any other suggestions I would be grateful for. Bytheway the teletext
    seems to have color

    cheers,

    from London,

    Alfredo
     
  2. Make sure the color setting in the menu is not the culprit. It does not
    affect the teletext.
    Try inputting something through the SCART, does it make any difference?
     
  3. Guest

     
  4. Guest

    I tried everything possible including using the scart, the next thing
    would be to get inside the tv, im looking through some service manuel
    to familarize myself before I start touching anything

    How do I recognize the chroma chip?

    cheers,

    -A
     
  5. Deke

    Deke Guest

    The set is old, AND its a sony. Use it as a boat anchor.
     
  6. Gerard Bok

    Gerard Bok Guest

    Sorry, I missed the start of this thread.

    If 'London' means: London UK, you probably have a PAL set.
    Color (or is it colour :) on teletext and black and white
    pictures is usually very simple:
    There is a 4.43 MHz or 8.86 MHz crystal on the board, next to a
    trimmer. The tuning of that trimmer probably has gone bad.
    (The chroma chip is the chip closest to that crystal. But who
    cares :)

    Find the region for the trimmer that shows color. And leave the
    trimmer at the center of that region.

    If you can't get color on any trimmer setting, replace the
    trimmer by a ceramic capacitor; 18 pf comes to mind :)
     
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