are you sure that your infrared code ist correct? I had similar issues and the problem was a missing = sign at the end of the code.
Also: check out this app “Sure Universal Remote”
It works with the RM Mini and has many codes for Samsung TV. The nice thing is that you can use the same Broadlink RM device for receiving and sending the Code at the same time. This is how I captured a direct HDMI1 switch code and separate on and off codes for my TV while it wasn’t working with the normal TV Remote.