ESP32 DEVKIT in infinite loop, no serial connection

[zgrate]

Hello
One day, after flashing software on my ESP32, it only dimmed the light down and disconnected from PC. Now, when I connect to PC (using different USB cables) the LED light up only a little bit, and the PC don't recognise the board. Only when I hold EN it is detected, but I can't flash new software using this method.
Is there any solution for this or the board is dead?

[ESP_Sprite]

What devkit specifically do you have? Are you sure there's nothing wrong with the power supply or USB cable, or anything shorted?

[zgrate]

DOIT ESP 32 DEVKIT V1

What pins should I check internally for shorts?
The power consumption (measured by USB charger doctor) is steadly on 0.02A during faulty boot, on holding ENABLE it drops to 0.00A (out of the range of the charger)

[ESP_Sprite]

Can you measure the 3.3V line on the board, see if that is drooping?

[zgrate]

Oh, it's 1.4V or 1.8V with ENABLE, so here is the problem
Should I check all pins or start with specific one?

[ESP_Sprite]

I think your LDO (the chip that generates 3.3V from 5V) might be broken in that case. Hard to say how that ended up happening, but you may be able to double-check by manually applying 3.3V to the board if you have a lab psu or something.

[zgrate]

Yep, problem solved. When I plugged in 3.3v external power, everything works. I've bought new regulator and will plug it as a replacement.
Thank you, topic to close