If the cable itself looks good, ie. no breaks, tears, cuts, then it is most likely the plug end.

It doesn't matter which end you start with, it's a good idea to open and inspect both.

Firmly hold one of the plug ends by the tip and sleeve, and twist off the back body housing counterclockwise.

Well, Doctor, this one looks just fine. The signal conductor in the center is clearly connected to the center tab. Below, the shield is firmly soldered to the retaining tab. It must be the other one...