I am running cm-11-20140719-NIGHTLY currently
Today my phone turned off on its own while connected to a car charger.
Here is what it is doing.
When the battery is connected the phone turns on and gets to the Samsung logo, then it goes black. No back light, nothing. If I pull the battery and re-insert it, it happens again. Once it goes black none of the buttons seem to be responsive (cannot force a reboot by holding the power button). Once it goes black if I connect it to a charger I get no LED indicating charge level.
If I try to boot into recovery I see the blue text and then it goes black.
If I try to boot into download mode I can get to the triangle screen if I am fast and then it goes black.
If I have a data USB cable connected and I connect the battery the phone does nothing, and will not respond to the power button, again no LED light indicating charge level.
If I have a charge only cable (wall outlet) connected and I connect the battery I see the battery charge icon for about 1 second and then the screen goes black. and the phone will not respond to any buttons.
I have duplicated all these things with 2 batteries both actual Samsung batteries, neither of the batteries is bubbled out at all.
I have tried leaving the battery out for several hours, but this did not help.
I have data on this phone that was not backed up so any suggestions I will try.