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Thread: Touch humming

  1. #1
    Senior Member
    Join Date
    Aug 2012
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    187

    Touch humming

    My SBT running 7.8.0 r16754 has started a low level hum / buzz on its audio outputs, almost like a ground loop effect.

    Nothing changed in the in overall system.

    The buzz/hum noise only kicks in once the unit is past the initial Logitech boot logo.

    The sound is present on digital coax, spdif, and RCA. It more noticeable/louder on the digital outputs.

    From time to time there is the odd crackle and pop.

    The SBT uses ethernet, WiFi is not connected.
    The SBT is on the original OEM PSU.

    I don't think it's a group loop issue with the amp, as the problem happens over optical, when no coax/RCAs are connected.

    Any ideas? I've done a search but can't find anything similar. Could this be just a PSU issue or more drastic? It's odd it's on digital and analog outs.

  2. #2
    Senior Member
    Join Date
    Aug 2012
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    187
    Just tested with a different PSU, still buzzing - something on the touch has failed. Any ideas?

  3. #3
    Senior Member
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    Aug 2012
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    187
    Seems to be a DAC issue. Fingers crossed.

  4. #4
    Senior Member
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    May 2010
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    Quote Originally Posted by atca View Post
    Seems to be a DAC issue. Fingers crossed.
    Even though you hear it on analogue/rca ?

    Long shot - disconnect Ethernet & try WiFi, to rule out very unlikely ground loop through Ethernet. (I donĺt have a Touch, so I donĺt know if it would be possible with a shielded Ethernet cable).

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