My vizio 37in hdmi tv has a ticking noise that comes through the speakers while on. i live in a duplex the tv is against the dividing wall between the duplex could it be something that is bleeding over from other side . (xmas lights ect)
Unless you are getting your input signal from an antenna (in or outside) it isn't likely being disturbed by radiating sources such as blinking lights, kitchen mixers, etc.
The shielding on any cable or satellite system keeps such airborne interference from invading your receiver.
You might just check to see if signal cables are well-attached; not with a wrench but a firm twist or those that just plug in should be pulled and reinserted in case a shield is not contacting well.
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