BeoLab 8000: suddenly switches to Off while playing music

6 replies

KolfMAKER

Bronze

569 posts

Posted December 29, 2023 at 03:07 GMT ? Edited December 29, 2023 at 03:30 GMT

I have one BeoLab 8000 (serial nr. 1086 xxxx) with strange behavior. My music source is connected via the RCA/Line input in the foot. The selector switch is set to RCA/Line. This is what happens:

When I start playing music, it does not immediately switch to On. Only when I set the volume on my source quite loud (appr. 85%), the BeoLab switches from Standby to On.
After having played music, but at a lower volume level then that made the BeoLab switch On, the BeoLab 8000 switches back to Standby/Off after appr. 35 seconds.
When playing music on the same volume level as the level that made the BeoLab switch On, it keeps playing.

Question

Anyone, any idea what could be wrong?

Location: The Netherlands

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auric

Bronze

681 posts

Posted December 31, 2023 at 09:28 GMT

#706450

The damping material has been known to degrade in Beolab 8000. Possible it has become conductive and shorting out some of the circuitry? https://www.youtube.com/watch?v=O9MHj4XsklE

KolfMAKER

Bronze

569 posts

Posted December 31, 2023 at 12:09 GMT

#706451

Thnx for responding and sharing your suggestion Auric. Yes, I know about the foamrot issue. In this I did check all PCB’s, connectors, etc. for foamrot. Some copper traces have had a ‘by-pass’ already. What bothers me is that at high volume/signal strength the Stand-by/On switching works well. But at low volume/signal strength it doesn’t. Do you have any other suggestions?

Location: The Netherlands

My B&O Icons:

auric

Bronze

681 posts

Posted January 2, 2024 at 05:00 GMT

#706480

I don't have any additional suggestions. My original thought was that the residue from the foam could be creating a short or adding some resistance hence higher signal goes through. But if the PCBs are all clean the fault is somewhere else.

Die_Bogener

Bronze

1477 posts

Posted January 2, 2024 at 11:22 GMT

#706491

The copper traces of the BL8000 pcb are very thin. Acid of the foam does it's job. And when there are already a lot of "by-pass" repairs... ok, you will need some more. There is not only the amplifier. There is also a round board in the foot with the LED. This board gets all the acid and debris of the foam... and is always forgotten...

KolfMAKER

Bronze

569 posts

Posted January 2, 2024 at 11:26 GMT

#706493

Thanks @Auric & @Die_Bogener I think what I will do next is switch the PCB with the LED. I have one of a working BeoLab 8000 that I can try if that makes a difference.

Location: The Netherlands

My B&O Icons:

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