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Thanks for all the background, super detailed! I had a similar problem on a new Samsung that was really flaky with my HDMI from a raspberry pi. Would have to do all kinds of unplugging, cycling power etc like you're doing to get it to work. Once on it would work until I turned the tv off (actually doesn't turn off, but goes to sleep) and back on. Finally figured out that the resolution I was outputting wasn't supported, BUT sometimes it would work. Once I changed the resolution to a supported resolution it worked all the time.
you may need to change the HDMI board in the tv. it will be the hole board the parts are just to small to replace them all to get the HDMI board working again. find a second hand replacement. should be fine with another known working one.
I am also having the same symptoms for my SV421XVT. TV works great except all HDMI ports are not receiving signal. Devices work through the AV Ports, and TV reception is fine. New Roku box is also not working through HDMI but works with AV. Wish I had a solution to this.
On a another forum for another TV it was suggested that boards need to be replaced. I hope I can get these boards for a reasonable cost.
I don't believe I can solve the solution, only sympathize, as I have a 46" C8000 and the 4 HDMI ports only seem to work when the TV has been in use for a while, and sometimes not then, I normally have to go to stand-by and turn the BD player on which in turn sends a signal to turn the TV on and on to the HDMI port being used, sometimes this doesn't even work. This is a replacement for the first TV which also had the same problem.
Try new hdmi cable. Try different inpus on set. Try another known good signal source to determine is tv or souce device if at fault. If aother hdmi connector on set ok then replace main brd in tv, if none of the hdmi inputs work even with known good cable and known good signal sourse the replace main board in tv