Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Troubleshooting Power Supplies and Power Supply Design
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 05-26-2020, 04:33 PM   #1
bosscharles
Member
 
Join Date: Mar 2013
City & State: BRISTOL
My Country: UK
I'm a: Knowledge Seeker
Posts: 32
Default Sonos Play 3 Power Supply

So I picked up a faulty Sonos Play 3 with a messed up power supply. Capacitor blew up took out traces.... fairly common occurrence. I recapped it and ran a cable connecting to the bridge rectifier. Upon trying it out, it always blows the fuse and gives a large bang... so shorting somewhere. Can anyone provide some guidance on how I could fix? It keeps blowing on the back of the board.. See Pics attached.
Attached Images
File Type: jpg D317064C-6AEE-46A7-98B8-67564F230A13.jpg (310.5 KB, 14 views)
File Type: jpg 4D7F0DB4-A3F2-46C6-BE63-419B28CC865F.jpg (254.1 KB, 13 views)
bosscharles is offline   Reply With Quote
Old 05-26-2020, 05:32 PM   #2
stj
Great Sage 齊天大聖
 
stj's Avatar
 
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 22,449
Default Re: Sonos Play 3 Power Supply

you need to check the rectifier, cut/scrape away all that carbon, and replace that jumper that almost touches with an insulated one - preferably with a curve in it to clear the other rectifier terminal
stj is online now   Reply With Quote
Old 05-26-2020, 06:01 PM   #3
R_J
Badcaps Veteran
 
Join Date: Jun 2012
City & State: ☻
My Country: Canada
I'm a: Professional Tech
Posts: 6,134
Default Re: Sonos Play 3 Power Supply

I found this picture of an undamaged board, top view of that area.
Check if the bridge rectifier is shorted
Attached Images
File Type: jpg 931f6835-b323-4276-8c16-c7ba8f553d58.jpg (616.7 KB, 8 views)
R_J is offline   Reply With Quote
Old 05-26-2020, 06:40 PM   #4
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 37,247
Default Re: Sonos Play 3 Power Supply

You should also remove the carbonized section of the PCB, it is conductive once it is carbonized like that.
I found some pictures here also: It looks likes those caps are all bad in these pictures.
https://en.community.sonos.com/wirel...86/index4.html
https://www.dropbox.com/sh/ba5g91xey...w=IMG_3695.jpg
__________________
Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956

Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999

Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl

Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/

TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809

Last edited by budm; 05-26-2020 at 06:54 PM..
budm is offline   Reply With Quote
Old 05-27-2020, 03:16 AM   #5
bosscharles
Member
 
Join Date: Mar 2013
City & State: BRISTOL
My Country: UK
I'm a: Knowledge Seeker
Posts: 32
Default Re: Sonos Play 3 Power Supply

Quote:
Originally Posted by stj View Post
you need to check the rectifier, cut/scrape away all that carbon, and replace that jumper that almost touches with an insulated one - preferably with a curve in it to clear the other rectifier terminal
Thank you very much for the response, so I'll cut away the charred bit of the trace/board. The jumper and the insulated wire are going to the + on the rectifier. I connected both directly as I'm not sure how bad the trace is. I know the one for cap 3 is completely busted but unsure for cap 2. Cap 1's trace seems fine hence I didn't jumper it. Could the carbon be causing it to blow the fuse and pop when I apply power? Thanks.
bosscharles is offline   Reply With Quote
Old 05-27-2020, 03:19 AM   #6
bosscharles
Member
 
Join Date: Mar 2013
City & State: BRISTOL
My Country: UK
I'm a: Knowledge Seeker
Posts: 32
Default Re: Sonos Play 3 Power Supply

Quote:
Originally Posted by R_J View Post
I found this picture of an undamaged board, top view of that area.
Check if the bridge rectifier is shorted
Thanks, I ran some tests on the rectifier and it checked out (as far as I'm aware) using this video https://www.youtube.com/watch?v=11JPy4t36oo

All my results were in the 500 range. So guessing it is OK. Could it be reporting erasonable values but still be busted? Thanks.
bosscharles is offline   Reply With Quote
Old 05-27-2020, 03:22 AM   #7
bosscharles
Member
 
Join Date: Mar 2013
City & State: BRISTOL
My Country: UK
I'm a: Knowledge Seeker
Posts: 32
Default Re: Sonos Play 3 Power Supply

Quote:
Originally Posted by budm View Post
You should also remove the carbonized section of the PCB, it is conductive once it is carbonized like that.
I found some pictures here also: It looks likes those caps are all bad in these pictures.
https://en.community.sonos.com/wirel...86/index4.html
https://www.dropbox.com/sh/ba5g91xey...w=IMG_3695.jpg
Thank you very much for the response. I have a feeling the issue is with the charred remnants of the traces so I'll cut those out with an xacto. One question though, what if there is an SMD sitting above the charred area? There is an area with 2-3 small smd components on the upper side but below it, the copper film has blown off...... I don't have the schematics so tricky to figure out how to jumper everything.
bosscharles is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums 2003 - 2020
Powered by vBulletin ®
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 05:32 AM.
Did you find this forum helpful?