Thank you for inquiring. My model is UN50KU6300FXZA. I have additional details to share... I have a cable box. If cable box is in Standby mode, TV remote turns on TV but does not turn on cable box. TV instructs me to press OK on TV remote to turn on cable box, and this works consistently. This is not a problem as same was case with my older nonsmart TV. It does demonstrate TV can send a cable box instruction to turn on. If the cable box is already on, the TV remote turns on TV with last selected cable broadcast on. Do not have to press OK on TV remote. Now the issue raised in above entry is...when TV remote turns off TV, it NEVER turns off cable box. Cable box remains on unless manually turned off or after 8 hours cable box automatically reverts to Standby mode. As noted above, TV remote can send a cable box instruction to turn on by pressing OK, so it must have capacity to communicate a cable power related instruction. I do not know if the same instruction would work for power off or if there is a different power off instruction (in other words is the instruction specific to "on" or "off" or instead "power toggle"). I hope this helps you understand the issue to relay to Samsung.
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A number of months have passed since the problem of not turning off cable box when turning off TV first appeared in this user forum. Many users with various Samsung smart TVs and various cable services have reported the TV remote turns on the cable box and TV consistently, but the remote turns off only the TV and not the cable box. Suggestions to update firmware, point the remote squarely at the cable box, etc. have failed to solve the problem. Can anyone confirm this issue has actually been brought to the attention of Samsung software engineers? Is there any hope of a solution?
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