Troubleshooting B&W Original Powersupply

[Slawit]

I volunteer at a local repair cafe and someone's brought one of these Zappelin speakers in, with a blown power supply board.

We've not had any success repairing the board, and B&W Trek me they aren't manufactured any more. Nor do they have any circuit diagrams.

I was wondering if anyone knew the output pinout (on the six pins)? What voltage they should be, which pubs are ground, etc. If we know that, maybe we can put together an alternative that provides the same requirements.

Thanks for your help!

[R_J]

Re: Troubleshooting B&W Original Powersupply

The diode is a MiniMELF diode, it could be a BAQ134-GS08 Switching diode or it may also be a zener diode BZV55 series?

The zener diodes pdf is here:

[mikey2230]

Re: Troubleshooting B&W Original Powersupply

Hi. can anyone idendify what component this is please (PIC1). I was soldering a CAP onto the board and this came off D305 (PIC2). I think its a Rectifier Diode but with it being in half I cannot test it. Also I am not good with the color's !! Quite close by there is also one I found on the board but not sure if it is the same (PIC3).





Mike

[thesmith]

Re: Troubleshooting B&W Original Powersupply

Hello!
anyone solved the problem?
My zeppelin 1g only red light flashing
my power supply have 5v and 25v too!

I Changed

2200uF 16V
470uF 16v
220uF 25V
1000uF 35v
caps, but same problem!

[ReeceyBurger123]

Re: Troubleshooting B&W Original Powersupply

Im half way through making a repair video of the zeppelin generation 1.

[DropThePuck]

Re: Troubleshooting B&W Original Powersupply

Thanks for all the information here.
I managed to pick up an original Zeppelin (inc remote) with the flashing red light in almost mint condition for £30.
I ordered the 4 grouped capacitors from Farnell. For anyone else that is going to do this, these were my issues:

• Disassembly is easy, apart from the grill removal. The buttons to unlock the grill are there but you have to press them just right. Then sliding to the left and right is tricky, but a firm grip will do it.
• Be careful removing the old capacitors. I managed to remove the copper tracking underneath two of them. Never had this problem on a circuit board before. So had to solder new caps from the top.
• As mentioned before, the plastic mounting posts are very brittle. I just ended up removing the broken bits and screwing into the base of the post that remained. It seems to be fine.
• Reattaching the ribbon cables is fiddly - be careful.
• Reattaching the grills is not easy, as a combination of squeezing the grill and sliding is awkward. Then, I got them the wrong way around!

I was not convinced it was going to work, but it did. It was definitely worth it, and an old iPhone 4 now plugged into it. Fantastic sound.
Thanks again.

[PanicMechanic]

Re: Troubleshooting B&W Original Powersupply

You can use basically anything from this: https://export.farnell.com/w/c/passi...-in-stock-grp1

Not sure what voltage you need, I put 16V to 35V. These are all low ESR.

[bsjoling]

Re: Troubleshooting B&W Original Powersupply

Some great info here too...
https://www.abcelectronique.com/foru...t=97071&page=1

[bsjoling]

Re: Troubleshooting B&W Original Powersupply

Hi fellow Zeppelin lovers.
I'm really struggling to find YXG 470uF caps. Can someone tell me an equivalent? Farnell, a major UK supplier no longer stocks them, so they are either superceded or ?
I'm going a bit cross eyed looking!
Thanks

[bsjoling]

Re: Troubleshooting B&W Original Powersupply

Does anyone know what 'flashing red' means? mine does it, but once I get it to turn on it says on untill I turn it off?
ANyone tried replacing the psu altogether? Is it just 25v or is it multi v output?
thanks

[Horatio]

Re: Troubleshooting B&W Original Powersupply

Oh boy, I lost mine Zep (1st Generation, metal back), too. - When plugged in, red light is flashing.

When reading related topics here and elsewhere, i suspect the PSU.

After dissassembling the unit, I expected to find some broken caps, but I would say that all caps look fine.
So this is the root cause why I'm here, I hope that some more experience eyes hint me to the possible reason.

But to be save, there are several photos taken from PSU and Controller Board #1 and #2, maybe i have overseen the broken part.

[sam_sam_sam]

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.

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

[OmidN]

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.

[OmidN]

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

[Per Hansson]

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

Yes I was going to say they look bulged in your first pictures...
Replace them and see how you go...

[stj]

Re: Troubleshooting B&W Original Powersupply

bulged caps are bad.
it means the liquid in them has boiled or generated gas.

[OmidN]

Re: Troubleshooting B&W Original Powersupply

Any advice please?

[OmidN]

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

[OmidN]

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

[stj]

Re: Troubleshooting B&W Original Powersupply

if you dont have a meter then how can you fix anything?