Troubleshooting B&W Original Powersupply

[budm]

Re: Troubleshooting B&W Original Powersupply

At least your version uses RUBYCON instead of the crappy caps.
https://www.badcaps.net/forum/showth...ighlight=B%26W

[Delirious]

Re: Troubleshooting B&W Original Powersupply

Thanks!

So are you saying I should use lets say Rubycon ZLH for all the caps I replace?

The reason I asked about the silicon grease was because I managed to remove quite a bit off it when removing and handling the board. Should I maybe add more?


Any point in replacing the Panasonic caps?

[stj]

Re: Troubleshooting B&W Original Powersupply

right, lots of questions.

rubycon is good, they only really fail from heat.
make sure you use the same series (ZLH, YXG etc.)

white stuff is nasty silicon grease, clean it off and use cpu cooler paste if you want - it will do the job better, but it's hardly critical.

caps should have a perfectly flat top, if it's slightly domed them the chemical inside has produced gas and created pressure.
sometimes instead of the top doming and then eventually bursting, the pressure forces the liquid out around the legs btw.

[Delirious]

Re: Troubleshooting B&W Original Powersupply

Thank you all. This is really good to know. I guess it is worth it to replace the capacitors. How confident can I be that the capacitors are the problem here?

Capacitors:

Top right (bulged) - Rubycon ZLH 2200 uF 16 VDC
Middle one left - Rubycon XYG 470 uF 16 VDC
Middle one right - Rubycon ZLH 220 uF 35 VDC
Bottom right - Rubycon ZL 1000 uF 35 VDC

Is new Rubycon caps a good replacement? They are easily available for me. Panasonic is also possible I think.


Also what is the white liquid? I am thinking it is thermal paste. If so can I replace it with thermal paste used for vga and cpu coolers? Or is there a better type to use.


Also how can you be so sure the top right cap is bad? Just curious. This is very helpful for me.

[CapLeaker]

Re: Troubleshooting B&W Original Powersupply

PSU is still in a good shape. Nothing burnt, but one cap (top right) is bad.

x2 on stj's comment.

[Khron]

Re: Troubleshooting B&W Original Powersupply

Going by the just-visible markings, i'd say that bulged(?) cap is a Rubycon ZL(H?), 2200u / 16v.

The bigger cap on the bottom right is a ZL 1000u / 35v, so it's a safe-enough bet the suspect one's a ZL as well.

[stj]

Re: Troubleshooting B&W Original Powersupply

nothing is burned, the brown is flux.

that cap top-right is bad, as you dont have an esr meter, yuo may as well change the whole group of 4 to be sure.
what exactly do they say on them?

[Delirious]

Hello all,


I just registered on this forum and hope that someone might be able to help me. I am trying to repair an older B&W Zeppelin for my parents. The status light is blinking red which according to B&W means that it need a repair. I searched a little bit around the internet and the power supply of this product seems to be a common problem.

I decided to open it up and take out the power supply. The first thing I noticed was that all the caps seems to be of good quality. Rubycon on the dc side and Panasonic on the ac side. (Excuse my terminology I am very much a beginner here).

However one of the caps a rubycon 2200 uF 16 VDC seems to slightly be bulging. Also there seems to be several burned spots on the backside of the pcb.


So as I see it there are two options:

- Replace some caps?
- Replace the power supply board for a new one (expensive)


Replacing the whole power supply will be quite expensive however might be worth it if this is where the fault lies. But how sure can I be that it is the psu? Also I have never replaced caps before at all so I am very much a beginner. Please keep that in mind.


I have attached some pictures of the board. Any help will be appreciated. The name and make of the psu is Abletec ALP0050-0000-H. Specs: +25V max 1A continuous 2.2A FTC/+5V max 1.5A continuous.