Chosen Solution

One of the speakers on my B&W P5 headphones is not working. How can I fix this?

First you have to find the where the problem is located. To do that use a multimeter to narrow done the offending line break or component break. This guide amy help you determine that: Bowers and Wilkins P5 Headphones Audio Cable Replacement Digital Multimeter

Measure the cable.. Maybe replace it

i have the same problem, an i use the multimeter and in the offending side is not showing any numbers, any solution to this?