I picked up an HML-to-HDMI adapter, and an adapter to get it working on my Galaxy S4. When I first plug it into a TV, everything is great! I can get a picture and sound on my TV in the expected resolutions.
After a few minutes, TV reports "no signal". If I unplug the cable from either the TV end or the phone end, the phone reports the HDMI cable disconnected. Plugging it back in on both ends, the phone reports that the HDMI cable is connected. However, I still don't see anything on the TV.
Rebooting the phone (via holding the power button and choosing restart) does not resolve the issue. If I plug the phone into a power source or USB port, and then switch back to the MHL adapter, it starts to work again.
This problem has occurred with multiple TVs.
I have a couple theories:
Some sort of power management shuts off the video output after a few minutes. (Note that I can be playing video and the phone screen stays on while TV reports no signal.)
An error condition with the interface that requires it to reset.
Any thoughts on how to fix this? Am I the only one with this problem? If so, I suppose I could have a funky adapter.
Source: http://android.stackexchange.com/questions/49565/mhl-only-works-for-a-few-minutes-on-galaxy-s4
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