Hello, i am new to arduino, i plugged in my Wemos D1 Mini Pro to my powerbank of 5V 2A to test out my program, it works for few time, even after plugging in and out , and after that, my Wemos does not work anymore when i plugged in to pc , any one knows how to fix this? Any help is much appreciated! Thanks!
It’s probably dead - the max supply voltage is 3.3 volts , I’m guessing you’ve just connected 5v to it and it’s died
I run a WeMos D1 mini on a powerbank 24/7, so that's not the problem.
Do you have the flashing blue light on startup?
Leo..
hammy:
It’s probably dead - the max supply voltage is 3.3 volts , I’m guessing you’ve just connected 5v to it and it’s died
It sounds as if you do not know what a Wemos D1 Mini Pro is. 
Suggest you do some research. 
Hello!
What do you mean by "does not work anymore when i plugged in to pc"?
I use a number of NodeMCU devices, and they sometimes refuse to be programmed. In my case, when that happens, it's usually because the Arduino IDE can't find the USB port it wants to use to upload my program to the device. If that's the sort of problem you're having (and you're using the Arduino IDE), check Tools/Port and see if you're USB connection to the Wemos is being recognized.
Please tell us more about the problem -- unless you've already solved it 