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Beolab 8000 Amp Modul removal & repair [Solved]

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gerard
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gerard posted on Sat, Aug 25 2018 12:52 PM

Hi,

my right BL8000 does not have any sound anymore.

Led turns to green from red when switching on.

The BL8000 is from 1993 Type 6801 I'm the first owner.

I have the service manual, took of the grid and took out the T20 torx screws from the amp modul.

But the modul wont come off , it apears to be glued.

Any idea how to get it out?

Thank's for your help.

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tournedos
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Verified by gerard

"Glued" is about right - it's the goo that used to be the gasket between the module and the pole. It WILL come off simply lifting it, but you will need quite a bit of controlled force. Do not bang it, just keep the force applied and you will see it slowly starting to lift. Work slowly and try to avoid scrathing parts of the pole that will remain visible, as you will probably need to apply some kind of a lever.

For the actual problem, look for broken traces at the edges of the PCB (and anywhere that has been in contact with the disgusting mess that once was the damping foam).

--mika

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tournedos
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Verified by gerard

"Glued" is about right - it's the goo that used to be the gasket between the module and the pole. It WILL come off simply lifting it, but you will need quite a bit of controlled force. Do not bang it, just keep the force applied and you will see it slowly starting to lift. Work slowly and try to avoid scrathing parts of the pole that will remain visible, as you will probably need to apply some kind of a lever.

For the actual problem, look for broken traces at the edges of the PCB (and anywhere that has been in contact with the disgusting mess that once was the damping foam).

--mika

gerard
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gerard replied on Sat, Aug 25 2018 5:38 PM
Thank's Mika

The modul does not move a 1/100mm even using all my force

Where could I use a lever?

Would applying some heat loosen this gasket glue?

At the long side border of the modul I can see very very little white drops of some sort of hard glue.

Is this the gasket you mentioned?

Using some heat from a household hairdryer did the job !! Big SmileBig SmileBig Smile

Not an industrial heatgun !!

hears a picture when its loose

gerard
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gerard replied on Sat, Aug 25 2018 9:30 PM
Thank you very much Mika.

Your tips were great! The Modul was not glued but only stuck on the old gasket.

1. I took off the gasket on the right lower corner near the modul

2. While heating with a hairdryer (not heatgun) I took away 1mm of the gasket between the modul and the tube using a sharp knife

3. Now I could get a 3.0 mm flat screwdriver into the little space I opened with the knife.

4. Still heating I pushed the screwdriver under the module half a mm after half mm.

5. I used a electro work screwdriver as the plastic isolation does less harm the aluminium when bending the screwdriver to lift the modul

6. Once it came off I saw the messy foam you talked about, there was only a little of it on the PCB ass you can see in the picture above. It was on the outer trace to the relay. I realy thought trace could not be harmed.

7. Testing the trace with the Ohm-meter , there was no contact between the starting points of the trace.

8. Cleaning it all up with some alcohol I got this view of the trace:

9. I soldered a new "trace" for each of the contacts of the relay:

10. put all together again and the speaker now works fine !!! Lets have a Party !!! Lets have a Party !!! Lets have a Party !!!

THANK'S THANK'S THANK'S

gerard

tournedos
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Well done! Yes - thumbs up

It seems very common that those particular traces develop a problem. While you're in there, you should remove the old damping foam and clean the boards - and do the other speaker as well as long as it still works.

--mika

gerard
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gerard replied on Sun, Aug 26 2018 2:00 AM
Do you replace the foam with new one?

If so, which one?
tournedos
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I didn't put anything in there, but I never play very loud either.

I believe you can still order new foams from B&O, if you find a dealer that agrees to do that for you. Or just cut a similar piece of some acoustically soft foam.

--mika

Dillen
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Dillen replied on Sun, Aug 26 2018 12:11 PM

And don't use ESD-foam. It's conductive.
Oh yes, I have seen that ...

Martin

gerard
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gerard replied on Sun, Aug 26 2018 12:53 PM

Do you have any Links for the right foam to use? As it appears to by possible to make fatal errors.

In the service manual I think the foam is listed as "damper", but there are no pictures of the place where they are and no picture of their original form.

Does anybody have this information?

Martin
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Yes, I had the same problem.

 

GLOP
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GLOP replied on Wed, Jan 13 2021 6:28 PM

Hello everyone, my very first post here.

I came to this thread by seeking out solution for exactly the same issue, one of my Beolab 8000 MK1 stopped working. It was the same trace and I rebuilt it.

I had to use the hair drier and everything worked.

While looking for the replacing foam I bumped into this eBay auction:

https://www.ebay.it/itm/Bang-Olufsen-Dampfungsmaterial-Dammung-BeoLab-8000-B-O-BeoPlay-Beo/154203121912?hash=item23e738e8f8:g:DSwAAOSwunNdpIEJ

What do you think guys? Should I buy 2 sets?

My best

GLOP

gerard
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gerard replied on Wed, Jan 13 2021 10:58 PM
it looks like the original replacement kit for one speaker.
GLOP
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GLOP replied on Thu, Jan 14 2021 9:23 AM

awesome, I was not really sure about it because the foam in mine looks black and less dense.

Any advise about where to buy spare parts (like the internal power section plastic support)?

Thanks for your kind support, gentlemen!

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