How to Troubleshoot LNB

By Allen Coleman

The LNB (Low Noise Blocker) on your satellite dish is the piece of equipment on the dish that receives the information from the satellite in the sky and sends it to the receiver that is hooked up to your television. If your LNB goes bad then your whole system goes down. In order to make sure that it is the LNB that has gone bad and not another failure in your system, you need to take a few minutes to troubleshoot your LNB.

Things You'll Need

  • Satellite signal strength meter
  • Coaxial cable

Step 1

Turn off the satellite receiver that is hooked up to your television. Wait 30 seconds and turn the receiver back on. This will reset your receiver. When the receiver resets and you still don't have a signal you know that the receiver is still working.

Step 2

Check the cables that are coming from your satellite dish to make sure they are not damaged and that they are properly connected.

Step 3

Remove the LNB from the end of the LNB arm by removing the screws on the bottom of the LNB bracket and sliding the LNB off the end of the arm.

Step 4

Remove the cable that is connected to the LNB and replace it with a shorter 3-foot coaxial cable. Twist the end of the cable counterclockwise to remove it and clockwise to tighten the cable.

Step 5

Slide the 3-foot coaxial cable through the LNB arm and slide the LNB back onto the arm. Do not secure the LNB to the arm yet.

Step 6

Connect the other end of the 3-foot cable to the input on the signal strength meter. Turn on the meter and check the signal strength. If you don't get a reading move the dish either right or left about 3 degrees at a time to see if you can locate a signal. If you do locate a signal, even if the strength is weak, your LNB is working. If you are unable to find a signal your LNB isn't working.

References & Resources