The left loudspeaker of my Beosound 2300 is not working when the radio is playing. It works fine with CD and aux. Any thoughts?

what's PCB?

I have no tv connected, I own a Beosystem 4500 + Beolab 4500. Tournedos you were absolutely right! The remote works ok ( I am impressed by the trick using the digital camera, it is really a good party trick to impress friends) , for some reason the remote switches to video. I only have to press again CD or Radio ot whatever I am listening in that moment

I have put a round piece of aluminium foil on those dots because they were worn but the problem is still there. I don't think is due to that because there are other dots with intact conductive paint ( for ex the buttons for mute) with the same problem. The funny thing is that after pressing the working buttons( for ex CD, Radio, Phono, Tape etc

I am new in this forum. I have a question for you : My Beolink 1000 has a peculiar problem. Sometimes the volume buttons don't work. Then I press the CD or Radio or Phono button which work normally and then I press the volume button again ant it works ok. Does anybody have an answer? Thanks