ESP32 Forum

I designed a custom PCB to control a 64×32 RGB LED matrix using an ESP32-S3. The issue I’m facing is that when I first plug in the power, the power LED lights up but the PCB doesn’t actually work. However, if I then unplug the power and reconnect it immediately, the PCB starts working perfectly.

This behavior repeats any time I disconnect the power. If I leave the board unplugged for about two hours, I need to do the unplug-and-reconnect step again to make it work.

Find attached the schematic.

You're lacking a proper reset circuit on your EN line; add an 1uF capacitor from EN to gnd to fix that. Also, you have C5 on GPIO0; on first powerup this will pull that line low and force the chip into download mode.

What does it mean? do I need to remove C5?

Yes, simply remove C5 and add an 1uF cap from EN to GND.

Thanks! that worked!