I'm controlling two TVs both '09 Samsung 8000 series LED UN55B8000XF & UN46B8000XF. I'm using RTI with a CM-232 on an XP-8s and official Samsung EX-LINK adapters. The problem is not general control, I can turn the units on and off with ease as long as I've recently powered on the display either manually or with IR. I'm not sure how much time needs to elapse but it's probably more than an hour so troubleshooting is tough.

My first thought was an eco power saving mode setting but it's already set to off. Any ideas? Do I need to switch something in the installer menu. It's just an odd problem and I'm having the same issue on both sets, but not a 3rd unit that is a Samsung Plasma which I think is also from '09.