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Getting MHL/HDMI video out to work

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http://forum.xda-developers.com – I have both a genuine Samsung MHL adapter and the S2 mhl adapter with the 5pin to 11pin converter and I've seen both of these work on other phones. However, I can't get my video out working on my S3. Both of them connect and bring up active charge and indicate onscreen that "HDMI cable connected". So I know the adapter and cable is being detected but no signal on HDTV. The HDMI cable is good as is TV and monitor I tested on and of course proper input is selected. Now as far as I remember as soon as it is plugged in the video should automatically show up on HDTV screen...correct? No (HowTos)