BeoLab 3500 remote (IR) not working

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  • #27892
    B3OHACK3R
    BRONZE Member

      Just a quick note here serving as a reference for people having issues with a BL3500 / LCS9000 not responding to remote IR commands. I think this wasn’t mentioned here before.

      You can fix it by replacing the electrolytic capacitors around the IR receiver chip (U 2506 B). Likely you are fine by just replacing the 22 uF / 6.3V connected to pin 3 of that IC but when you are at it maybe replace the larger 22 uF / 10V and the 4.7 uF / 25 V as well.

      Certainly that also applies to other products using the same IR circuit.

      #27912
      Madskp
      GOLD Member
        • Denmark

        Great info. Think i has been mentioned now and then, but with reference to the same IR circiut in other products and that it was the blank/shiny caps. So great with actual reference with values.

        #27916
        B3OHACK3R
        BRONZE Member

          BTW I got the schematic from the old BeoLink Active service manual. The IR eye is using the same circuit and it’s included in there.

          Only had matching ceramic caps on hand but that’s working well. Used slightly higher voltage ratings due to the dc bias characteristic.

          #29755
          B3OHACK3R
          BRONZE Member

            Nice how-to repair guide with pictures by another forum member available from here:
            https://forum.beoworld.org/forums/topic/beolab-3500-sometimes-responds-to-remote-control-sometimes-it-doesnt/#post-29738

            • This reply was modified 1 week, 3 days ago by B3OHACK3R.
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