High quality cables - but with a soldering defects

I have several cables of this series and was actually
of the robustness and quality always satisfied.
As an engineer, I look always like the solder joints
at. From this it can be read out much.
The plugs go easily (perhaps too easy) to unscrew.
This Y-cable had an objectionable
Soldering on. The signal wire was not at the soldering point
been shortened and therefore had contact with the ground.
This short circuit in principle a KO criterion.
The problem I've finally solved itself.
Tip: Always look at the solder joints before use,
before you surprised that no signal arrives.