Did you check the basics, like selecting left/right position switch?

Yes, I tried both left/right lever positions when daisychaining the speaker and also when going to toslink in first. Is there a required position when the speaker is first or second in the chain? I am happy to try again.

Yes, I tried both left/right lever positions when daisychaining the speaker and also when going to toslink in first. Is there a required position when the speaker is first or second in the chain? I am happy to try again.

It doesn't matter if it is left or right; just can't be on the wireless position.

Regarding the toslink connector on the speaker...there is an input and output. Did you check if the output of one speaker is connected to the input of the other?

Once I had problems with my BL5 for not observing this...

I connected the streamer toslink out > toslink in of speaker A + toslink out of speaker A > toslink in of speaker B = sound for speaker A, no sound speaker B

I also tried going directly from streamer to toslink in of speaker B = no sound. Putting the same cable to toslink of speaker A = sound. 

Because the RCA in of speaker B works, I think the speaker is fine. When I bought them the prior owner also demonstrated them with his Beo system (using powerlink) and both speakers worked fine. 

It really looks like a speaker problem...

Toslink is the optical version of SPDif, right? Using a flashlight, try to see if there is any debries blocking the light inside the connector.

Another try would be using a Wisa transmitter to check if the problem is on the Toslink input only or in all digital input processing.

Thanks for all the tips. I put the the speaker on the side and looked at the optical input. To my untrained eye, it all looked fine. 

Yeah, I think SPDIF is a digital interface that can be both optical or coax. I think toslink is the name of the connection. 

I dont have a WiSA transmitter at hand so I cannot check that. I just hope that because the previous owner used a powerlink cable, the speaker is generally fine on the other inputs. And the analogue in is working too for what its worth (dont  want to use analogue though due to loss of sound quality).

Next Monday I want to go to a nearby B&O store and check if the toslink can be repaired at a reasonable expense. But I am almost expecting that it will be cheaper to just use a different mode of connection. 

Would someone perhaps know about my questions around connections? I am basically looking for the cheapest way to connect the speaker without using the one broken toslink.

Is there a (digital) cable from coax or toslink into the RJ45 powerlink input? 

Or can I use the toslink in of one speaker and then connect that speaker through a powerlink to the other one? Or do I need to use toslink throughout if I start the daisychain with toslink?

Would a Beosound Transmitter 1 work, i.e. optical in from my Yamaha and then through WiSA to the speakers? Or is there a cheaper alternative?

Thanks