While I love my 1 year old 50inch 2021 QN90A TV, every 2 weeks or so I I will get a black screen/no sound or video but no audio. The only way to get everything back is to restart the cable box, coincidentally a 4K Samsung rented from my cable distributor. Unplugging/plugging the HDMI cable does not work and switching on/off both devices neither. Only a reset of the cable box (at times even that doesn't work) sets things back to normal.
The TV's HDMI test says the cable is fine, everything else works. I tried different ports to no avail.
I'll buy a new HDMI cable to see if that fixes it. Any suggestions for a good HDMI for 4k TVs?
Could the cable box be at fault? I'd rather change it than have my TV serviced.
If you tested this cable with another device with no issues, call your cable provider and see whats the best option to replace your cable-box due to your issue. If they don't provide HDMI cables, make sure you buy at least a Premium Certified Cable, the newest one will be an Ultra Certified Cable.
More info at hdmi.org/resource/cables