[eiouwa]

Hello.
My K701s recently fell down to the floor, now the right side dosn't work anymore. I don't see any obvious damage on the headphones. Is there anythig I could do to get it working again? What could have gotten damaged when nothing is visible?

 

[Mad Max]

Perhaps your cable is quite oxidized and that tumble was the nail in the coffin for the right channel wiring.
 
Maybe a solder connection was loose already and the tumble broke it off.
 
It could be that the tumble caused the right channel signal wire inside to loop over itself, which cuts out the sound, I don't know why.  I learned that the hard way when recabling my K701 - it took me a while to find the right way to position the internal wiring in the left cup to avoid cut outs.
 
Maybe the right driver's voice coil somehow took damage from the impact and now it is "dead", but I consider this the least likely outcome, very highly unlikely.

 

[eiouwa]

Yes I also thought that it's unlikely that the voice coil is 'dead' now. I'll have a closer look at the inside some time.