How to determine what is wrong in Arduino?

Question

Arduino

Good afternoon.
I decided to find a hobby and found it on my head, so much so that I lost my sleep :) candy wrappers like a fool) soldered the board according to the scheme, cleaned it with alcohol and a brush, it cooled down during this time and connected it. This board is built using the cp2102-gmr chip (I would kill that asshole who designed this circuit on this chip, and even for beginners). The MK itself works blink blinks the LED, but the cp2102 worked for 10 minutes and fell off the device manager. USB power comes in, the com port does not appear in the devices. Tell me where to drop to fix it, otherwise it's inconvenient for me to sew through ISP

Answer 1

Judging by the story, poor soldering cp2102.
PS in Chip and Dip'e notably scoff - to solder nano3 with a grm chip, and even take money for it 5 times more than a ready-made board can cost. And you agreed to this - yes, I see you are a pervert, my friend !!!