➜ Confirm the input function of the sound bar is set to optical. Audio problems with the optical connection are normally caused by a faulty cable, poor connection, or improper sound settings. Tried going from a Windows laptop out to a projector (both 4K at 30fps). It utilizes light signals to carry audio data from the source device, such as a TV, soundbar, or game console, to the audio output device, such as a. However, like any other cable, optical cables can malfunction or become damaged, leading to poor signal quality, dropped connections, or even complete system failure. So, how do you know if your optical cable is working properly? In this article, we'll explore the signs of a faulty optical cable. Optical cables, often referred to as fiber optic cables, have become integral to our everyday lives, delivering high-speed internet and crystal-clear audio and visual signals.