1. Ask Sling if they offer a fix.
2. Consider using Component Video instead.
3. Get a HDMI port duplicator. One of those boxes (figure under 100) that let you run 2 displays in parallel. These little boxes have to do the HDMI HDCP handshake so it sidesteps the TV on issue altogether.
Remember that HDMI is not consumer friendly. The committees did a fine job with the connector (well if you call Intel a committee?) but they were so concerned about copy protecting the content that you see too many failures like this.
I have a new Samsung 55 inch TV Model #UN55EH6050FXZA. The TV is great but since I purchased it, my Slingbox will only work when the TV is on. I believe that the HDMI cable shuts down the handshake to my set top box and therefore I cannot view my TV via my slingbox over the internet when i am away. I have been told to turn off CEC-HDMI setting in the settings menu. That particular screen does not appear on my Samsung model. Is there a way to control the CEC function of this TV and will that help with my issue?