EASY !!!![br]
In most cases, it is the speaker that is the problem !!!
Easy to change:
1. 2 screws inside the earcups and the cloth piece (The earcups are "clips" on plce...use your finger all the way around until you hear click....every 2 cm.....)
2. Use a scalpel to open the cover of the speaker (NB!! warm up a bit first...hair dryer works fine!)
3.Unsolder the speaker and solder a new one !!
EVERYTHING OK !!!