My loudspeaker does not work anymore

I fixed my broken display but now my loudspeaker is dead...

After investigating mored etailed I had to notice that there is a small conductor piece missing, so that the loudspeaker is lying directly on the frame / aluminium plate and there is no connection to any circuit board..

on this picture you can see that conductor piece: https://d3nevzfk7ii3be.cloudfront.net/ig...

Who has an idea?

Cheers

HaGe