I have the same problem. 75" Q7FNA TV doesn't recognize the HDMI connecting to a N850 soundbar、PC and android TV box. It worked fine until 14 days ago. I've tried a few different hdmi cables. Samsung have changed new HDMI circuit board of smart hub for me, but can't sloverd this issue. Maybe it was caused by an update of firmware of 1294.1.
I have the brand new 55 inch Frame tv and the hdmi will not recognize my cable tv box but will recognize all my other accessories....3 calls to tech support and they said i needed a service call..this tv is a week old
I have a Samsung 55" Q6 Series QLED 4K UHD Smart TV QN55Q6FNAFXZA for a little more than one year old. Tried all the method like power off for a long time and factory reset many times. All 4 HDMI ports not working. Any help will be appreciated!