Question

Sonos Sub logic board schematic or serial port?

  • 7 August 2020
  • 5 replies
  • 1140 views
T

Hi dear community!

I just got a used Sonos Sub off a deal and I knew it is not working when I’m doing the purchase. However, after I got the Sub and did some testing to set it up I realized it is more complicated than I thought to fix it.

 

So basically the devices just have a white LED constantly flashing, no response to anything, including hold the button to reset. I read from the support page that a constant white LED flash indicates boot failure. There are some interesting symptoms as well: when I connect it to ethernet cable, and search for devices using the iPhone app, it gives “found 0 Sonos product”,(instead of “No Products Found” when it completely powered off), and when I click the Setup button the app just crashes.

 

 

So basically I assumes there are some problems in the logic board, since it powers up fine and both boards looks in good shape(it’s already teared down). I have no other clues and searched around the community but can't seems to found any resources. For some reason I am not able to refund this unit, so I am stuck with it, and some how I would like to take the journey to repairs it for fun. 

 

Just wondering if anyone experienced similar symptoms on the Sub? Or are there any serial debug ports on the logic board I can use to see the boot loader debug logs ?

 

 

Any help or chat would be awesome!

Thanks

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5 replies

T

So this is when I have it plugged in:

 

 

This is the screen when there are actually no devices found:

 

N
Userlevel 7
Badge +18

How much do you know about Sonos products? Do you have any other Sonos speakers? The sub needs to be bonded to another speaker; it can’t operate on its own. 

T

Yeah I currently have a Playbar and two Ones configured.

N
Userlevel 7
Badge +18

That’s fine - nothing was showing on your profile so wasn’t sure! 

T

Ok, so I've got the logic board powered up here on a 12V supply via the connector to power supply board, as expected no different behavior, still just a while LED flashing.

 

Also I have noticed there a 4 pin connector footprint:

Not sure what this is, but this is the closest thing to probably a UART serial port I can found after looking around the board. Will have a look at what it is

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