HDMI Connection flickers when ceiling Fan is switched on/speed increased
Although some may suggest a better cable it may be the amount of electronic noise from your speed controller, electronic speed controls create electronic noise in the form of harmonics, an external torid on the outside of the longer cable may dampen the noise picked up on the longer cable a ferrite washer shaped disk with the cable running thru it possibly with a extra pass through may do the trick on your existing cable. The next option might be placing a faraday cage over the controller this cage dampens the em noise signal much like a toride or ferrite core. If you have multiple phases or a split phase system moving the TV &amp; computer to a different leg of the system may also resolve the problem. I have experienced many kinds of electrical noise in my career some times even a better (longer and multiple ) grounding rods have helped but more often EMI filters prior to the power supplies have done the most good (emi filters are usually simple capacitive / inductive filters that dump non 50/60hz signals to ground).