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Pietje Puk
Trending Lyricist I
February 28, 2021

Fix for Sonos Play:5 with very low volume

Hello Forum,

I just fixed a play 5 which was having very low sound at max volume settings. Scanning through the forum I see many other posts but no fix. The issue is not the amp but the fact that the 24V for the amp stage is not triggered when you select "play". There is a mosfet (Q27621) switching the 24V power to the amp stage. This mosfet could be dead or, like in my case, the signal feeding the gate of this mosfet not getting applied. There is a small circuitry near the mosfet, tracing this back leads to the large CPU board  connector. Just before reaching the connector there is a 10kOhm resistor (R27835) which was dead in my case. I replaced it by an "old fashion" one which can take some more power. I hope this will help some folks to give their Play 5 a 2nd life. Good luck!

 

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    26 replies

    timc995
    Prominent Collaborator I
    March 1, 2021

    Nice find!

    When the circuit did not come on… Was there any error in the app or light on the Play:5?

    Pietje PukAuthor
    Trending Lyricist I
    March 1, 2021

    Nice find!

    When the circuit did not come on… Was there any error in the app or light on the Play:5?

    No errors or light. Everything looked normal. Just no sound and very faint at max volume.

    amun
    March 1, 2021

    It’s really good to see people posting about actually fixing faulty Sonos kit, rather than simply ‘recycling’ it.

    For the sake of a few (probably quite cheap) components and some skill, the planet’s just a tiny bit better off ;-)

    Keithmac
    Virtuoso
    March 1, 2021

    Excellent repair there!, a 2 pence resistor saving a very expensive speaker.

    Jywl12
    Lyricist III
    March 3, 2021

    Great share Pietje. Will try to replace the resistor this weekend.

    Pietje PukAuthor
    Trending Lyricist I
    March 3, 2021

    Great share Pietje. Will try to replace the resistor this weekend.

    Jywl12, before you replace, check the value with a multimeter. No need to replace a working part...as I indicated, the mosfet is another target as well as a few other parts controlling the gate signal.

    Jywl12
    Lyricist III
    March 5, 2021

    Here are my readings

    R27835 - 10k ohm

    R27834 - 4.99k ohm

    R27827 - 5.00k ohm

    R27828 - 20.08M ohm

    R27833 - 198.7k ohm
     

    looks like R27828 is the one.

     

    Pietje PukAuthor
    Trending Lyricist I
    March 6, 2021

    Here are my readings

    R27835 - 10k ohm

    R27834 - 4.99k ohm

    R27827 - 5.00k ohm

    R27828 - 20.08M ohm

    R27833 - 198.7k ohm
     

    looks like R27828 is the one.

     

    Yes for sure, R27828 should be like R27834 and R27827, from the foto they seem to have the same code (68b - 4.99kΩ ± 1%). This resistor is also in the path from the CPU board to the gate of the mosfet. I bet replacing it will fix your problem. Please let us know!

    Jywl12
    Lyricist III
    March 6, 2021

    My store doesn’t sell 68b, so I used the normal resistor as well. 
     

    Finally my play 5 bounced back to life!!!!
    Really thanks to you, Pietje in pointing out where to troubleshoot. Cheers!!!

      Pietje PukAuthor
      Trending Lyricist I
      March 6, 2021

      My store doesn’t sell 68b, so I used the normal resistor as well. 
       

      Finally my play 5 bounced back to life!!!!
      Really thanks to you, Pietje in pointing out where to troubleshoot. Cheers!!!

      Thanks for sharing Jywl12. As amun said, 

      "the planet’s just a tiny bit better off"...hopefully this post can rescue a few more. And whoever at Sonos reads this, think about recycling this way instead of the entire device!

      Show more replies
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