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Old 04-15-2020, 06:01 AM   #21
Rich2371
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Default Re: Troubleshooting B&W Original Powersupply

Hi just joined this forum, I need help with an Zeppelin ( early MK1) my Red led is on not flashing, I've replaced all six caps ( two showed signs of stress outer casing s wrinkled) but it still the same just a constant red led on (Stuck in standbye)? Checked all three fuses all ok�� .
Any ideas please, thanks��
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Old 11-14-2020, 12:09 PM   #22
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Default Re: Troubleshooting B&W Original Powersupply

Hi all,

Picked up a B&W Zeppelin for free last night and was told it had stopped working although it lights up but shows the red flashing LED. After following the guide I found the 47uF 400v and 2200uF 16v caps swollen, ordered up a full set of Panasonic FR caps for 12 and going to see if I can get it going.

I'll keep you posted on whether its operational at the end of the next week.

Thanks for your write ups and advice, most helpful.
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Old 11-17-2020, 03:29 PM   #23
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Default Re: Troubleshooting B&W Original Powersupply

Hi again,

I took the opportunity to replace all 6 caps with Panasonic FR types and paid princely sum of 12, it took no more than an hour to repair. It's now working again and sounds great, for a freebie I cant complain. Just need a blue tooth dongle and add some new fabric over the speaker grills to make it mint again.

I am a little gutted as my son has pinched it for his room.
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Old 01-22-2021, 04:03 PM   #24
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Default Re: Troubleshooting B&W Original Powersupply

Hello,
I came across this forum and it seems it the only good help on the net. I had the same issues and I decided to follow the instruction to open my speaker, but when I reached PSU it doesn't look evident to me. Maybe the yellow one?

I appreciated it if someone could help.

Thanks
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Old 01-22-2021, 05:51 PM   #25
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Default Re: Troubleshooting B&W Original Powersupply

strange,
the 4 diodes - D201 etc look like they have burned/corroded leads.
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Old 01-23-2021, 03:47 AM   #26
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Default Re: Troubleshooting B&W Original Powersupply

Hi Stj,
Many thanks for your quick reply, so do you think i would change them first and give it a try?
could you please let me know the model and the details of the 4 diodes to purchase?

Sorry I don't have electronic background , I am just trying to avoid throwing electronics
Thanks again
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Old 01-23-2021, 04:13 AM   #27
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Default Re: Troubleshooting B&W Original Powersupply

test them with a meter
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Old 01-23-2021, 04:25 AM   #28
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Default Re: Troubleshooting B&W Original Powersupply

Thanks for your help and prompt reply.

I should find a place to test them since I don't have the meter.

When i looked closer it doesn't seem to me that they are burnt, maybe it was the photo.

PFA a better photo

Thanks
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Old 01-23-2021, 06:37 AM   #29
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Default Re: Troubleshooting B&W Original Powersupply

if you dont have a meter then how can you fix anything?
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Old 01-23-2021, 08:33 AM   #30
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Default Re: Troubleshooting B&W Original Powersupply

Yes you are right, I thought if I can find the problem I will go around and ask someone in the electronic repair shop, but anyway I am going to buy the meter and soldering kit to be independent!
Thanks
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Old 01-25-2021, 08:03 AM   #31
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Default Re: Troubleshooting B&W Original Powersupply

Hello Stj,
I have check the diodes D201, all 4 seems to be good, on the good direction they are reading around 470 and opposite OL.

on the other hand I touched the surface of the capacitor in the photo, it seems bulged, I also see the one behind is a bit bulged, as far as I understood from this forum I have to order 4 capacitors below:

Rubycon ZLH 2200 uF 16 VDC
Rubycon XYG 470 uF 16 VDC
Rubycon ZLH 220 uF 35 VDC
Rubycon ZL 1000 uF 35 VDC

could you please advise?
Thanks
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Old 01-27-2021, 11:02 AM   #32
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Default Re: Troubleshooting B&W Original Powersupply

Any advice please?
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Old 01-27-2021, 11:52 AM   #33
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Default Re: Troubleshooting B&W Original Powersupply

bulged caps are bad.
it means the liquid in them has boiled or generated gas.
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Old 01-30-2021, 03:44 AM   #34
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Default Re: Troubleshooting B&W Original Powersupply

Quote:
Originally Posted by OmidN View Post
Hello Stj,
I have check the diodes D201, all 4 seems to be good, on the good direction they are reading around 470 and opposite OL.

on the other hand I touched the surface of the capacitor in the photo, it seems bulged, I also see the one behind is a bit bulged, as far as I understood from this forum I have to order 4 capacitors below:

Rubycon ZLH 2200 uF 16 VDC
Rubycon XYG 470 uF 16 VDC
Rubycon ZLH 220 uF 35 VDC
Rubycon ZL 1000 uF 35 VDC

could you please advise?
Thanks
Yes I was going to say they look bulged in your first pictures...
Replace them and see how you go...
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Old 02-01-2021, 03:49 AM   #35
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Default Re: Troubleshooting B&W Original Powersupply

Many Thanks, I will keep you updated, I am ordering them through https://fr.rs-online.com/web/ca/recapitulatifpanier/

Just for the record in case if anyone else need that in future
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Old 02-05-2021, 04:43 PM   #36
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Default Re: Troubleshooting B&W Original Powersupply

Hello,
Many thanks for your feedbacks, I changed those 4 caps and my speaker is back to live. I appreciate it, A few comments for the next person:

1. I have damaged the seat for PSU, basically I tried to screw it back gently but somehow all the seats damaged. The plastic became brittle. I eventually managed to fix 3 of the screws so PSU doesn't move.
2. Please look at the disassembly a few times before you start opening, I damaged the locks for the front cover. now the cover is not 100% fixed in its place.
3. In my order the 470uf caps were a bit fatter than the original one, so I was struggling to solder it in its place.

Last edited by OmidN; 02-05-2021 at 04:45 PM..
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Old 02-05-2021, 08:25 PM   #37
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Default Re: Troubleshooting B&W Original Powersupply

Quote:
Originally Posted by OmidN View Post
Hello,
Many thanks for your feedbacks, I changed those 4 caps and my speaker is back to live. I appreciate it, A few comments for the next person:

1. I have damaged the seat for PSU, basically I tried to screw it back gently but somehow all the seats damaged. The plastic became brittle. I eventually managed to fix 3 of the screws so PSU doesn't move.
2. Please look at the disassembly a few times before you start opening, I damaged the locks for the front cover. now the cover is not 100% fixed in its place.
3. In my order the 470uf caps were a bit fatter than the original one, so I was struggling to solder it in its place.
If you have access to plastic spacers or plastic square bar and the right length screws and square bar would probably be the best thing to try or metal “L” bracket screw one side of the “L” into the cabinet and the other side of the cover if you have access to treaded rivets mount them on the side of where the cover is being mounted to the “ L” bracket


I have done this many times in the past when the original plastic pin break use plastic spacers and screws in place of the broken plastic pins or if you have access to circuit board stand-off is the best solution for this type of problem
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9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *


These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board

All of these had CAPs POOF
All of the mosfet that are taken out by bad caps

Last edited by sam_sam_sam; 02-05-2021 at 09:13 PM..
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