InFocus Projector - Intermittent display due to Audio Frequency

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  • Audioplus
    Senior Member
    • Feb 2012
    • 157
    • USA

    #1

    InFocus Projector - Intermittent display due to Audio Frequency

    A church is having an intermittent issue with their InFocus projector. Whenever a particular low frequency bass note is present, the picture on video display will shut down.

    Initial idea is video cable termination and what other component within the projector might be a culprit?

    Any ideas to trouble shoot is appreciated!
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: InFocus Projector - Intermittent display due to Audio Frequency

    Perhaps a problem with insufficient power supply to the projector and amplifier. When the amplifier draws too much current, the line voltage drops causing the projector to reset. Or, it could be mechanical vibration - cold solder joint etc.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

    • Audioplus
      Senior Member
      • Feb 2012
      • 157
      • USA

      #3
      Re: InFocus Projector - Intermittent display due to Audio Frequency

      Hi Tom

      Gut feeling is mechanical, I guess I could run a frequency sweep. I think there is a EQ in the audio system, might be able to filter that frequency out?
      I'll have to check on the power supply idea as well, if they're using same circuit for audio & video.
      As always, thank you! FYI, been in the A/V industry for 25 years, worn all kinds of hats, recently about 15% of my business is TV repair. www.audioplusidaho.com

      Comment

      • shovenose
        Send Doge Memes
        • Aug 2010
        • 6575
        • USA

        #4
        Re: InFocus Projector - Intermittent display due to Audio Frequency

        Try placing the unit on a bettery backup UPS unit and then unplug the UPS. Then you will know it's not electrical

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #5
          Re: InFocus Projector - Intermittent display due to Audio Frequency

          If you do that, make sure the UPS is true sine wave; a lot of projectors can't ballast the bulb properly from the modified square wave output of some cheaper inverters/UPSs.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

          Comment

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