How to Test a Coax Cable

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A coaxial cable is used to connect audio/video devices together, such as televisions, VCRs and DVD players. The single cable send both A/V signals, so damage to the cable can cause issues with both. Even though the cable is inexpensive to replace, you should text the coaxial cable to see if you can continue using it, without taking a trip to the electronics store.

Things You'll Need

  • Coaxial cable
  • Electrical tape
  • Needle nose pliers


  1. Securely connect the cable to the device you want to send the A/V signal to and the hardware you want to send the signal from. The coaxial cable screws onto the connection port, so you want to hand tighten the cable as much as possible.

  2. Power on the television and the connected device. Turn up the volume and change the stations. If the video and audio is fine you know the cable is functioning properly also.

  3. Inspect the cable for any damage if the audio or video is dropping out or you are receiving distorted signals. Any cuts in the cable can cause this. Secure the cuts with electrical tape. This prevents the signal from escaping the damage in the cable.

  4. Remove the coaxial cable from the devices it is connected to and look at the small metal pin in the middle of the cable's connector. If the pin is bent you are going to receive distortion. Straighten the pin with the needle nose pliers.



  • Photo Credit Coaxial cable image by lefebvre_jonathan from

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