If your LNB is receiving Horizontal (H) frequencies but not Vertical (V), or Vertical frequencies are working, but H frequencies are not getting DD Free dish signals. The most likely cause is a polarity switching issue — either the LNB itself has failed on one polarity, or your receiver/cabling isn’t supplying the correct voltage to switch between H and V.
Satellite LNBs switch between polarisations using the voltage supplied by the receiver:
13V DC → Vertical polarization
18V DC → Horizontal polarization
If you only get H channels, then your receiver may not be sending 13V properly.
If you only get V channels, then your receiver may not be sending 18V properly.
What to do?
Set-Top Box Settings -
Ensure your satellite receiver is configured to output the correct voltage for V/H channels.
Some receivers have “LNB power” options — confirm it’s enabled.
Some receivers have "Polarity" options in satellite settings - confirm All is selected not H or V only.
Connect a different satellite receiver to the same dish/LNB.
If V or HD frequency still doesn’t work, the issue is likely with the LNB or cabling.
Inspect Coaxial Cable & Connectors -
Look for corrosion, loose F-connectors, or damaged cable.
Replace with a fresh cable if in doubt.
Change the LNB -
The simplest fix: replace the LNB. They are inexpensive and often the root cause when one polarity fails. It means the LNB is faulty.
If still not working, then? -
Faulty LNB: The LNB is getting signals from one polarity; the other one is defective.
Check Connection: Using long or poor-quality cables can cause a voltage drop, preventing proper switching.
Receiver faults: Rare, but possible — if the power supply inside the receiver is weak, it may not deliver 13V or 18V consistently. So, try to change your Power adapter.