Unable to enter boot mode after some use of a custom pcb

[malfrax]

Hi everyone,

I'm new to designing pcb and using esp32.
I created a custom pcb that permit me to have easy use of wled, potentiometer and other stuff on it.
For that I have two buck converter in paralele with 5V and 3.3V.
At start everything worked fine, I was able to enter boot mode without a problem but after a while, pressing the boot button doesn't work anymore. I got the red led flashing with a delay of a second but no serial communication.
It seem that when I press the boot button, it does simply nothing and I got the error :
A fatal error occurred: Failed to connect to Espressif device: Wrong boot mode detected (0x13)! The chip needs to be in download mode.

I tested all capacitors on my pcb and the esp32 and nothing is shorted.

You can find the schematic of my pcb, and the schematic of my esp32 NodeMCU module.
Thanks in advance for your help !

Custom PCB :


Esp32 NodeMCU :


Esp32 PinOut :

[bidrohini]

The board functioned well at the beginning, as you've written. So, I don't think there is a problem with the design. The common solution to this problem is to press the boot button on the esp32 board when running the code. But sounds like you already tried that with no luck. However, some other points have been suggested here:https://github.com/espressif/esptool/issues/741 you can check these out.
And if you still want to check your designs by PCB experts, you can post your design here: https://www.pcbway.com/project/questionpublish