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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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    Freddy99
    Lyricist I
    May 15, 2021

    Great information and guide.

    I had the exact same symptoms and after following the advice here……exact same faulty resistor.

    All working now. Thank you.

     

     

    Japtastic
    Trending Lyricist I
    June 16, 2021

    Thanks for all the info. My Play 5 has been the same as the above for the last year or so. I don’t have enough expirence to troubleshoot my self but with the info here I started testing and found that all resistors mentioned were within spec apart from R27828 which gives OL so I will repalce it tomorrow.

    Earlier it was doing the same thing, playing music but very very low even on full volume. Now, strangly, it has just started working which it would do intermittently before. 

    With it working I measure 25v on the MOSFET at all 8 pins when playing music so not sure quite what is going on here?

    Also, is it normal for a slight hissing sound to be heard from these units while powered up?

    timc995
    Prominent Collaborator I
    June 16, 2021

    The hiss isn't normal.

    On the MOSFETs...that's not right either.  The device may have failed.  With no power applied, give it time for the capacitors to all discharge, and then check for continuity between the pins.  If they are all shorted together then it's bad.  If not, you can use the diode test function and should see either infinite or a small voltage drop between the gate drain and source pins (check all six combinations).

    This isn't guaranteed to work as a test of a MOSFET in circuit, but it will usually be enough to find a problem if there is one.

    Japtastic
    Trending Lyricist I
    June 16, 2021

    Thanks Tim, will give that a go. The odd thing is that it’s been sat here on my desk working for the last few hours but this is what it did before and it just got so bad that it only worked occasionaly.

    Japtastic
    Trending Lyricist I
    June 17, 2021

    Repalced the resistor and still working. Still get 25v on all pins of that MOSFET though :hushed:

    Will just have to see how it goes now. Was intermittent before so wont know for a few days / week if this has worked.

    ScottFerg
    Lyricist I
    August 23, 2021

    Pietje, you’re a genius. You saved me $600! My Play:5 went down just after buying my first Gen2 Sonos product so I thought it was a software problem. Just before giving up I found I could barely hear music at max volume, searched & found this thread, and replaced the same resistor. Back alive! I nearly ruined the solder pad on the PCB but managed to get it done.

    I was lazy and didn’t replace any of the hot glue on the coaxial antenna connectors. I guess I should go back inside and do that given how much vibration they will endure.

    Thanks again for sharing this solution!

    Scott

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