Powerline adapter affecting television signal reception.

Solution
Is the TV on the same electrical ciruit or outlet?

How is the TV receiving its signal - coax?

Is the TV on your home network or is some other home network device connected to the TV.

Do any of the television's cables run past the power line adapters or their respective cables?

There really should not be any interference so my suspicion would be a possible IP conflict with respect to the TV and/or any related network connections.

Can you provide any additional details about the overall network and television setup? Especially if the TV is network capable.
Is the TV on the same electrical ciruit or outlet?

How is the TV receiving its signal - coax?

Is the TV on your home network or is some other home network device connected to the TV.

Do any of the television's cables run past the power line adapters or their respective cables?

There really should not be any interference so my suspicion would be a possible IP conflict with respect to the TV and/or any related network connections.

Can you provide any additional details about the overall network and television setup? Especially if the TV is network capable.
 
Solution