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Brand new 75” Samsung TV wall-mounted above fireplace mantel, Beam placed on mantel, centered directly under (and close to) the TV.   When watching Netflix/Amazon Prime no issues at all.  When watching cable TV the picture flickers on and off.  When i move the Beam to the left side of the mantel the flickering stops.  As soon as I center it again the flickering resumes.  Anyone else experiencing this problem?  FYI, unplugging Beam HDMI didn’t help.  Not able to unplug  Beam power cord without removing the TV from the wall.  

Check the connections on the cable box cable.  It may be loose and experiencing vibrations.  It could also be a bad cable, so if it is tight, try another cable.


Thanks for your reply.  I checked the cable box connections and they all appear good.  The HDMI and cable are snaked behind the wall…..