Issues with connection (possibly burned chip?)

[laggenerator]

Hello, I made my own PCB with ESP32-S3-Mini-1U-N8. I have an issue that it doesn't show up on my PC nor my laptop, i checked with two normal cables and one with swapped data pins. I've already made two PCBs with S3-mini, the only difference from the working ones and this one is that it's a 4 layer board and the gpio assignments changed.

I already checked:

• 3.3V gets to the 3.3V pin on the ESP32
• GPIO0 is at 3.3V, goes to 0V when pressing Boot button
• EN pin is at 3.3V, also goes to 0V on press
• GPIO45 and GPIO46 are pulled down.

I don't know what could cause this since the microcontoller, chip boot control and button sections were copied from the schematic of a working pcb.

After some thought I came up with a possibility that I burned the chip. For the first assembly I decided to desolder ESP32 from a PCB that got destroyed (the esp worked fine), I used default 350C hot air station temperature for quite some time since I had to heat up the chip take it off, then solder it on the new board with a hot plate set to 215C. Then it didn't work, so i took it off and hot air soldered a new one with the same 350C setting. I swapped this chip before and it still works, but is it possible that I ended up damaging both esp32?

TLDR: I don't know what causes ESP to not work, is it possible to damage the board by heating it up for too long while hot air soldering?

[Sprite]

Can you still reach U0TXD? Might be useful to see if there's any serial debug info emitted on that pin.

[laggenerator]

I never thought about including test points or pins for uart but it could be useful in future projects.

I could try getting a small wire or a probe on the TX pad, thank you for that idea.

[laggenerator]

Case closed. I didn't get any signal on TX pin so I surely damaged it during soldering. I assembled a new board and it works fine.