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Snap, crackle & pop

Discussion in 'Projectors, Screens & Video Processors' started by larsan, Feb 18, 2002.

  1. larsan

    larsan
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    I just got back from a vacation and fired up the old BG1209.

    Approx. 1 hour into the movie I hear a loud POP from the PJ, and at the same time the image shrinks both horiz. and vertically for a second. Then all is normal.

    This happened again after 2 more hours.

    What is this?
    Powerspikes?
    Tubes arcing?

    I don't want to turn on my PJ if I don't know why it occurs...

    Please helppp

    Regards,
    David Karlsson
     
  2. Roland @ B4

    Roland @ B4
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    Opps just remembered I owe you a bit. I'll look it out and send it off.

    Your tube just flashed over it is normall after abit of inactivity. the surge of switching it on after a fest stured up some stuff an caused the beam of electrons to short to the side of the tube rather than carry on down to the phospher.

    the fact that it recovered shows it was only a minor flash. I would leave it running with a moving image. (there you go, a proper excuse to watch a few films).

    Some times the circuits which dump the high tension voltage when this happens can't recover and it shuts the EHT right down (fans will keep running) the only way to recover it is to phsyically switch it off the back on again once the RED light had gone off.

    One word of warning although it sound frightening the later Barco's had clever circuits to deal with flash overs and it is always better to let the projector shut down on its own or from the remote rather than pulling the mains lead or switching it off.

    The only time to worry is when this get progressivly worse, which could be an indication of a tube starting to fail because air is getting in but I don't think that is your case.

    Hope that helps
    roland
     
  3. larsan

    larsan
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    Yeah, thanks.

    So I should not be concerned that it happened twice in 4 hours?


    'Bout that Decoder board, I had planned to contact you about it. Take your time. No rush.


    Regards,
    David
     
  4. Roland @ B4

    Roland @ B4
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    Only worry if it starts getting much worse. Keeep the projector running.
     
  5. larsan

    larsan
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    Hey Roland.

    I had it up and running for about 3 hours yesterday.

    Silent as a whisper :cool:
     

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