Well, I interfaced an opto-isolator that turns a relay on to provide power to a stereo and sub-woofer. When the TV is turned off the stereo turns off as well but then 10 seconds later turns back on to eventually turn of later. So I think there is a capacitor still providing power to the port until it drains. I was looking here to find answers but do not see any. I have to check the voltage and current and see if it drops of and how. That may shed light on it.
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