I recently got this TV and so needed build an upgrade for it. There's already a lot of Samsung upgrades in the file download area, and it seems Samsung haven't changed their codes during the years. The existing stuff worked fine... except for DiscreteOn/Off.
Digging through old memories I remembered a search method and found the EFC-Search protocol document. Some experimentation later, I found DiscreteOff was hex E6 and DiscreteOn was has 66. IR converted those into EFCs, which I could then enter into keymap master.
I've uploaded my resulting file to http://www.hifi-remote.com/forums/dload ... e_id=11673 in case it helps anyone else.
Samsung UN50EH6000
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