I need help, currently I am working in final project about portable monitoring system. I am using Arduino Pro Mini 5V/16MHz as microcontroller and a Li-Po battery to power it up through XL6019 boost converter. I have created the PCB and assembly all components but suddenly when I turned it on, the Arduino Pro Mini suddenly stopped working. Recently I am adding a feature to measure the battery capacity so I connected the battery voltage to arduino pro mini Analog Pin, is that the problem? But I have tested the method of measuring battery capacity using Arduino Uno before and it worked fine. 
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I am confused right now about what is the main problem.. and also is there any way to repair the Pro Mini? The Pro Mini used in project can't be reseted and I can't upload any program to it.
Pls help.
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Denny Octavian
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What voltage did you connect to the Pro Mini's analog pin? Was it greater than 5 VDC? – VE7JRO May 18 '18 at 18:08
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The Li-Po battery output voltage, it around 3V - 4.2V (fully charged). – Denny Octavian May 18 '18 at 18:56
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Are you have checked the voltage in the output of XL6019 is 5V? – Ian May 18 '18 at 20:47