BeoLab 8000: suddenly switches to Off while playing music

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  • December 29, 2023 at 3:07 pm #27870
    KolfMAKER
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      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?
      December 31, 2023 at 9:28 am #27991
      auric
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        The damping material has been known to degrade in Beolab 8000. Possible it has become conductive and shorting out some of the circuitry?

        December 31, 2023 at 12:09 pm #27993
        KolfMAKER
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          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?

          January 2, 2024 at 5:00 am #28035
          auric
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            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.

             

            January 2, 2024 at 11:22 am #28050
            Die_Bogener
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              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…

              January 2, 2024 at 11:26 am #28052
              KolfMAKER
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                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.

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