No audio from S/PDIF optical output on Realtek ALC1200 (MSI B550 mobo)


  1. g502
    Posts : 2
    Windows 7 x64
       New #1

    No audio from S/PDIF optical output on Realtek ALC1200 (MSI B550 mobo)


    Hello all

    I have an MSI B550M Mortar motherboard which has Realtek ALC1200 onboard audio. Currently running Windows 7 x64.

    I'm trying to use the S/PDIF optical output with Logitech speakers but I'm not getting any sound output at all no matter what formats I test, or what settings I apply.

    Additionally, I only see options for "2 channel" output formats whereas there should be 5.1 channel options too.

    The speakers and optical cable are confirmed working with my old motherboard's onboard audio.

    The Hardware Ids of the MSI B550M's ALC1200 audio device are:
    HDAUDIO\FUNC_01&VEN_10EC&DEV_0B00&SUBSYS_1462EC94&REV_1000
    HDAUDIO\FUNC_01&VEN_10EC&DEV_0B00&SUBSYS_1462EC94

    Things I have already tried:
    • Latest "Univeral" Realtek audio drivers from their site (R2.82)
    • Older Realtek drivers which worked with an Asus motherboard (R2.80)
    • Drivers from a different MSI motherboard with similar onboard audio for Windows 7 (driver v6.0.1.8619)
    • Drivers from a totally different mobo (Asrock) which uses the same chip as mine (driver v6.0.9132.1)


    An extremely helpful driver modder has been trying to help me on a Techpowerup forum thread but so far I've had no success. I discovered a related thread on this forum from 2012 (!) so I thought I would ask here as well because people here seem very knowledgeable.

    I'll try anything at this stage - I've wasted a whole day trying to make this work.

    Any suggestions are very welcome.

    Thanks.
    Last edited by g502; 19 Apr 2021 at 22:01. Reason: More info
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  3. g502
    Posts : 2
    Windows 7 x64
    Thread Starter
       New #2

    First motherboard must have had a dried audio chip. No red light from optical port and even the analog 3.5mm speaker outputs refused to work.

    I replaced the motherboard with an identical but working one and then followed this procedure and it works now:
    Help needed: can't get Realtek ALC1200 working on MSI B550M motherboard under Windows 7 | TechPowerUp Forums
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