If you have a faulty LNB on your minidish, you may experience missing channels or a ‘no signal’ error message displayed on your TV screen. We’ve put together a list of some of the symptoms of a faulty LNB:
If you are not able to watch some channels, or if you have lost all of your Sky TV channels, you may have a faulty LNB.
Check that this is not caused by a fault with your Digibox by connecting a borrowed Digibox to your dish and seeing if that solves the problem. If the problems persist, it indicates that your Digibox is not faulty, and that the issue may lie with your LNB.
Problems with either horizontal or vertical polarisation channels
Sky TV channels are transmitted in either horizontal or vertical polarisation, and the LNB switches between these polarisations depending on the channel. You can find a list of the horizontal and vertical channels online.
If there is a problem preventing the LNB from switching, you will experience a loss of some channels, and an on-screen ‘no satellite signal is being received’ message will be displayed.
You may also see intermittent disruptions to channels on a particular polarisation, including a breaking-up or freezing TV picture.
The fault could also be caused by the Sky Digibox not switching the DC voltage correctly, so make sure that the Digibox is not faulty. Replace either the Digibox or the LNB.
Problems with low band or high band channels
In addition to switching between vertical and horizontal polarisation, the LNB also responds to a tone sent by the Digibox to switch between low and high band satellite channels.
If there is a problem with the LNB preventing it from switching between low and high bands, you will see an on-screen ‘no satellite signal is being received’ message on the affected channels.
This may mean that the LNB is faulty, and needs to be replaced. Reference: How do I install my Sky Hub?
TV reception problems during cold weather
If the temperature is extremely cold outside and you experience a loss of signal, it may be caused by a faulty LNB. However, snow or ice build-up on the dish can also lead to poor reception.
How to replace a Sky Dish LNB
If you have checked that there are no faults with your cables and connections, and have checked that your Digibox works when you connect it to a friend’s dish, your Sky TV problems are probably caused by a faulty LNB on your dish.
A step-by-step guide to replacing your LNB:
1. Buy a replacement LNB that is suitable for use with your Sky dish model
2. Turn off the power supply to the Sky box
3. Remove the LNB’s retaining pin from the arm on the dish
4. Remove the self-amalgamating tape from around the F-type connectors
5. Disconnect the coaxial cable from the LNB
6. Connect the cable to the new LNB
7. Connect the LNB to the LNB arm on the dish
8. Waterproof the connections by covering them in self-amalgamating tape
9. Check the dish’s alignment, especially if you’ve replaced a single output LNB to a Sky+ Quad output LNB, as the extra weight can alter the dish’s alignment.
If after following this guide your problem is not resolved. Then consider picking up the telephone to call Sky customer services. Before you call be sure to have the items listed on this page available to expedite your call.