Sonos Playbase S11 dead. No led at the front

[waakye]

Good days guys,
First of all I want to thanks all members of badcaps. This site and its members have help me troubleshoot and repair tv.
My issue is a Sonos Playbase S11 that completely died on me. Fuse check out ok. No indication of burn on the power supply board. The two big caps are showing 135vdc. I can't seem to find a schematic anywhere.
I need your help once again.
Thanks in advance.
Images are attached

[waakye]

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

Any help guys.

[budm]

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

Canadian AC Voltage is 120VAC, correct? If it is then the Main filter caps should have about 165VDC measured between the + and - legs of the main filter cap.
What is the P/N of that SMPS IC, U15?, that drives the power MSOFET on the heatsink?

[waakye]

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

Hi budm thanks for replying. That's correct canadian AC voltage is 120VAC. U15 P/N is NCP 1937B1G.
Thanks again for your help.

[budm]

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

So recheck the DCV of the main filter cap again, the cap will be charged up to the peak Voltage of the 120V RMS, 120V x 1.414 = about 169VDC. So may be your meter is not calibrated or error in measurement.

[waakye]

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

I double check with another multimeter and am reading 160.3vdc on the main caps.

[CapLeaker]

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

I double check with another multimeter and am reading 160.3vdc on the main caps.

That is o.k. probably your mains are 110-115V.

[waakye]

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

Is odd because the power led on the Playbase is not on. There is no switch to turn it on. You just connect the Playbase to 120vac outlet and the the front led turns on.

[waakye]

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

Are there any schematic of this power supply board around. Could someone help to troubleshoot the circuit.
Thanks

[waakye]

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

A more zoom in pictures below.
Thanks again

[waakye]

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

I guess am on my own on this one.

[waakye]

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

Any help guys!

[Zinge]

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

I have the same one. Problem
Does anyone know how to solve it? Maybe it's the software?

[budm]

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

Any help guys!

If you measure the DCV between the two legs of any one of the 3 lytics green caps that are glued together, do you get any Voltage when the AC is applied to the board? Be real careful not to touch anything in the hot, so to be safe you may want to plug the AC cord into GFCI outlet.

[waakye]

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

Thanks budm for replying. Below are my observations:

I have AC applied to the power supply circuit and the each one of the 3 lyrics caps are measuring 13.25VDC and it jumps to 14.53VDC and it keeps cycling continuous from 13.25VDC to 14.53VDC.

Thanks again

[budm]

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

1) So the power supply is not dead then, that power supply is an always on power supply, it will run 24/7 as long as it is plugged into the AC outlet.

2) What is the DC Voltage rating as printed on the bodies of those 3 caps?

3) There are four lytics caps on the cold side, so check and see if they have any DCV on the two legs of each cap, also tell us the Value and Voltage rating of those 4 caps.

[waakye]

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

Hi budm. Thanks for the quick reply.

1) If the power supply is not dead then that means the logic board is toast?

2) the voltage rating on the 3 caps are 35V

3) I verified the voltage on the four lytics caps on the cold side and all four reads 13.25VDC then goes to 14.53VDC and keeps cycling between the above values. The DC voltage rating on the caps are 50V.

[budm]

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

The board you have is the power supply/Amplfier board.
Can we see the main logic board next?

[waakye]

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

Hello budm,
Below are the pictures of the logic board as requested.
Thanks for your help in this.

[Zinge]

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)