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These are my Solutions and what I Dug Up
When I first got my TFP I was having trouble charging with the Wall AC adapter. I tried multipul plugs in my house, sometimes 1 plug would work and my TFP would show it was charging. then if I unplugged it from the wall and plugged it back in it woudnt work. I researched for a long time thinking it was something wrong with the Cable, then Android build, finally narrowed it down to combination of Wall adapter and Voltage needed by TFP to initiate the Fast Charge state. Everything below is from reading other posts and trial and error with plugging and unplugging the wall adapter and USB cable. I did NOT use a Multimeter personally observe the voltage states. So if someone has correct me if my research is incorrect.
Solution #1: I unplugged the USB plug from the AC adapter and lightly scratched the pins with a knife or tweasers. I found out that in order for the Transformer Prime (TFP) to display the charging icon on the screen, the TFP has to recieve 12+ volts from the wall adapter to initiate (Fast Charge = 12v - 15v). Any time that the wall adapter was used to charge and the Charging icon does not appear most likely your TFP is only getting 5v (Slow Charge), same as connecting TFP to PC with USB cable ( Only if your PC recognizes the TFP when plugged in ).
Solution #2: Anytime Im not charging my TFP or TFP + dock, I have to leave the AC adapter disconnected from power. Until I wanted to charge my TFP or dock. From what I have found out is the Thermal Cut-Off that is built into the AC wall adapter is easily activated. When it is activated it will only allow an output of 5v. I recieved my Dock after I learned about the Thermal Cut-Off issue, but since then I try and keep my Dock Charged so when I plug my TFP into the Dock my TFP will charge.
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