Can't flash PICO, it not show any COM PORT - how to fix it?

Posted on Tue 23rd, February 2016

• #1

bigplik

Hi, today plenty of times I uploaded code into my Pico and it stock,
I wanted to flash it but now I can't see the com port, when I pressed the button I see two LEDS on, stable not dimming.
How Can I fix it?
• #2

DrAzzy

Check voltage on VBat and Vcc pins.

They should be 4.7ish and 3.3 respectively. If they're much lower, you probably shorted the output and blew the diode.
• #3

bigplik

I fixed it, before I soldered 4 usb wires into usb plug on Pico and after some time it stop working (bad wiring) and when I cleaned it port com wasn't recognized until I cleaned plug more.
• #4

Gordon

Glad you got it sorted...

The USB pins in the USB sockets aren't really 'sprung', so it's really important the face of the USB plug on the Pico is flat.

Also the Pico's plug is gold-coated - if you then cover it in solder, that solder can oxidise and mean there isn't a very good connection any more.

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