Terrible ground loop interference..

[vNa5h]

Any more inputs guys...

Will a coaxial isolator help...
There is something like 75 ohm.. Lightening protector written on it

Guys a little help with this

 

[jls001]

An isolator is most likely a transformer to stop transients induced by lightning from reaching the set to box. It won't do any good for your current problem.

A number of suggestions had been given for you to try. May be you'd like to tell us what you have tried and with what results.

 

[vNa5h]

See if you can try one more thing - check the path of the TV coax cable from outside your home to the set top box, and see if at any point the coax is running very close to a power line. If yes, try separating them permanently by at least 6 inches. And if possible, run power line and coax crossing each other and not parallel side by side.

This can't be done as the wires are concealed

 

[vNa5h]

You mean thick wire coming from Dish Antenna to STB?
If that is correct then all mains earth pin in your 3-pin adapters are non working or improper. Get it corrected if below thing does not work.
As a workaround - using thick diameter copper wire, connect outer shield or pin metal jacket of coaxial wire to RCA metal jacket or towards PC chassis.

This didn't help...

 

[vNa5h]

Still not able to solve this guys..

 

[vNa5h]

Still have to remove the plug every time.

 

[vNa5h]

This is a very annoying issue