Left ear phone isnt working

[J doggy dog]

The subject explains it all I have gone through 30 head and ear phones at least and persisted in my s3 and later on 6

 

[hang-the-9]

Not really sure what your question is about the 30 headphones you went though. Are you saying in all of them the left side stopped working? Only time this happens is when a connection breaks, cable gets yanked, something physical. You either need to open it up and solder the connection, replace the wire, whatever needs to be fixed or replace it. If it never works, then you may be the jack in whatever you plug it into.