Actually it makes perfect sense Your TV provider has implemented HDCP so will not output a video signal from the cable box until it receives a valid handshake from an HDCP-compliant device. The TV is compliant, the Slingbox isn't. So you only get a signal with the TV on.
BTW, you are wrong about the POWER ON. Slingboxes are permanently switched on, I think you actually mean the video stream ?
Thanks for the info. I was just really surprised that the TV had power
control over the Sling without having any direct connections, all via
the cable box.
Re: POWER ON- you are right in a sense that the Sling has no power
switch. It's electronically switched by sensing a signal I guess from
I'm not sure you understand my explanation so let me try again. The Slingbox actually has nothing to do with this discussion, It is not being switched in any way, so you can forget all about it.
All that is happening is that your cable box will not output a video signal until the TV is switched on.
So both your statements are incorrect. The TV does NOT have any power control over the Slingbox, it simply has control over the video output of the cable box. And in your second statement, there is NO electronic switching going on. It is just that if there is no video signal arriving at the Slingbox then it will display a blank screen. Once a video signal arrives it will start to stream it.