Sonos Playbase S11 dead. No led at the front

[waakye]

Re: Sonos Playbase S11 dead. No led at the front

Hi Zing, are there specific points on the logic board that I can verify the main voltages (RAM, FLASH,CPU)?

[waakye]

Re: Sonos Playbase S11 dead. No led at the front

Hi Zinge,
Could you tell me exactly which points I can measure the main voltages for the logic board (RAM, Flash, CPU)
Thanks

[budm]

Re: Sonos Playbase S11 dead. No led at the front

I'm sorry I got into your topic. I didn't have any output voltage from the power supply
There was a short circuit (0Omh) on the three Green capacitors
As a diode, there is a mosfet Q4. It's been burned down.
As I replace it I will say or do it


PS/
Author of the topic check the main voltages on the board (RAM,FLASH,CPU)

That MOSFET Q4 is part of Active rectification (or synchronous rectification) circuit, the Gate of the MOSFET is driven by IC U16. Look up the part number of the IC so you can get the spec sheet and it may include application circuit for the IC.
C249 connected in series with resistors R409//R410 are RC snubber for Q4 Source and Drain pin, make sure they are OK. Hopefully U16 is OK because if U16 us bad and the output of U16 causes Q4 to stay on instead of switching on and off then Q4 will be damaged.

[budm]

Re: Sonos Playbase S11 dead. No led at the front

https://www.badcaps.net/forum/attach...8&d=1619775827

I see at least two switching power supplies (look to Buck converters), you can see the black inductors with 4R7 printed on top, then in that section you will see lytic caps and look like some tantalum caps ( black rectangular device) with 107 printed on top, so check the DCV between the legs of those caps.
Also provide the zoom in pictures of those power supplies sections so we can read the prints.

[waakye]

Re: Sonos Playbase S11 dead. No led at the front

Hi budm, thanks for pointing it out. I took the DC measurements and attached an image with my findings.
I am getting 4.96VDC on all the caps. the side with the stripe. The other side reads 0v most likely because its the ground.

[budm]

Re: Sonos Playbase S11 dead. No led at the front

What DCV do you read on that Lytics cap C335 (22UF 35V)? I expect about 14VDC.
Since you are getting about 5VDC, that means it is 5V Buck converter.
How about the Voltage of another buck converter on the top right of the board? I see IC U4 in that section, you need to the Voltage readings on those MLCC (Multi Layer Ceramic Capacitor, TAN Color looking caps)

[Zinge]

Re: Sonos Playbase S11 dead. No led at the front

I installed Q4 AUIRFB4410 end the output voltage appeared 13.5V.
I'll try to enable it

[waakye]

Re: Sonos Playbase S11 dead. No led at the front

I am reading 14VDC on the cap C335.
I am reading the following voltages on the caps on the MLCC caps: 14.02VDC and 3.31 on the other side on the caps . I have an image attach with specifics. also C4 is reading 14.02VDC
Thanks

[waakye]

Re: Sonos Playbase S11 dead. No led at the front

Anywhere else I can verify?
Thanks

[Zinge]

Re: Sonos Playbase S11 dead. No led at the front

We need to look for software . Write to the manufacturer

[waakye]

Re: Sonos Playbase S11 dead. No led at the front

You think the software on it might be corrupted?

[waakye]

Re: Sonos Playbase S11 dead. No led at the front

Hey Zinge, any progress on your end?

[budm]

Re: Sonos Playbase S11 dead. No led at the front

I am reading 14VDC on the cap C335.
I am reading the following voltages on the caps on the MLCC caps: 14.02VDC and 3.31 on the other side on the caps . I have an image attach with specifics. also C4 is reading 14.02VDC
Thanks

So you also have 3.3V, so far you do have 5V and 3.3V to run the logic circuits.
What is the history of the unit? It mat be FW issue. Did you do any search to see if other people have the same similar issue?

[waakye]

Re: Sonos Playbase S11 dead. No led at the front

The unit randomly stop working when I was watching TV. I actually thought it was a bad cap that gave up.
Thanks for your help budm. I will search on Google if I can find a firmware. Thanks again.

[waakye]

Re: Sonos Playbase S11 dead. No led at the front

Sonos were no help. Hey Zinge, you mind sharing the firmware on yours here?

[Zinge]

Re: Sonos Playbase S11 dead. No led at the front

After the replacement, MOSFET started working. Currently working. I will check whether it will work
The firmware is unique. There's a MAC address...keys. I have nothing for you to read the software from The Flash

[waakye]

Re: Sonos Playbase S11 dead. No led at the front

So I plug the Ethernet cable directly to my router and from the Sonos app, I was able to successfully download the firmware even though the speaker did not have the standby led on. What I found that after I increase the volume of speaker via the app, the app stops responding and the speaker stops playing. Once I unplugged and plug the speaker, I have to go through the process of adding the speaker again.

[waakye]

Re: Sonos Playbase S11 dead. No led at the front

Many thanks goes to budm for helping me on how to troubleshoot the circuit.
Thanks Zinge for your input as well.