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Re: Old MBP's headphone jack port don't always work with connected speakers.

Cross-posted to 2 groups.

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In comp.sys.mac.portables David Empson <dempson@actrix.gen.nz> wrote:
> Ant <ANTant@zimage.com> wrote:

> > The old 13.3" MBP (mid-2012; Mac OS X v10.8.5/Mountain Lion)'s headphone
> > don't always work with various speakers (powered and non-powered). 
> > Speakers seem to have no problems with his iPhone 6+ though. I looked at
> > MBP's headphone jack to see if it was dirty, but it looked OK? It was
> > hard to see inside though even with a flashlight.
> > 
> > Has anyone had this problem before? Thank you in advance. :)

> A possible explanation is a faulty socket which is mistakenly activating
> digital optical audio output rather than analog audio output. If it only
> happens for some speakers, it might only be happening while the plug
> from those particular speakers is connected - perhaps it is a slightly
> different shaped plug which is falsely triggering the digital optical
> output mode, or there could be a physical obstruction in the socket
> which is preventing the plug from going all the way in, resulting in the
> same effect.

I forgot to mention that these are analog speakers only.


> If the output was stuck in digital mode you would see a red light in the
> socket when looking into it, but if it only happens while a plug is
> inserted, it may be hard to spot.

Hmm, we never saw this red light before but then we don't have any 
digital speakers.


> There is another way to tell: with the speakers plugged in but not
> working, if the output is in digital mode and you try to use the
> computer's volume adjustment keys, the on-screen popup to show the
> volume adjustment will indicate that volume adjustment is disabled.
> (That's because digital optical output is fixed level - volume needs to
> be adjusted on the output device, not the computer.) 

> Similarly, the output volume adjustment in System Preferences >
> Soundwill be greyed out, and the list of output devices in System
> Preferences > Sound > Output should mention digital output rather than
> "Internal Speakers" or "Headphones".

Ooh, we will check that. Will it say analog if analog speakers are 
connected?
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Old MBP's headphone jack port don't always work with connected speakers. ANTant@zimage.com (Ant) - 2017-02-07 00:41 -0600
  Re: Old MBP's headphone jack port don't always work with connected speakers. Nelson <nelson@nowhere.com> - 2017-02-07 04:31 -0500
  Re: Old MBP's headphone jack port don't always work with connected speakers. dempson@actrix.gen.nz (David Empson) - 2017-02-08 10:33 +1300
    Re: Old MBP's headphone jack port don't always work with connected speakers. ANTant@zimage.com (Ant) - 2017-02-08 02:14 -0600
      Re: Old MBP's headphone jack port don't always work with connected speakers. dempson@actrix.gen.nz (David Empson) - 2017-02-08 21:29 +1300
      Re: Old MBP's headphone jack port don't always work with connected speakers. Jolly Roger <jollyroger@pobox.com> - 2017-02-08 15:14 +0000
        Re: Old MBP's headphone jack port don't always work with connected speakers. ANTant@zimage.com (Ant) - 2017-02-09 03:02 -0600
          Re: Old MBP's headphone jack port don't always work with connected speakers. Jolly Roger <jollyroger@pobox.com> - 2017-02-09 13:11 +0000
            Re: Old MBP's headphone jack port don't always work with connected speakers. ANTant@zimage.com (Ant) - 2017-02-09 19:18 -0600
              Re: Old MBP's headphone jack port don't always work with connected speakers. Jolly Roger <jollyroger@pobox.com> - 2017-02-10 02:10 +0000
              Re: Old MBP's headphone jack port don't always work with connected speakers. Lewis <g.kreme@gmail.com.dontsendmecopies> - 2017-02-10 23:51 +0000
          Re: Old MBP's headphone jack port don't always work with connected speakers. Steve Carroll <frelwizzen@gmail.com> - 2017-02-10 18:21 -0800

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