My Naze32 rev6 died mid-flight this weekend. Just stopped working. I completely disconnected it from the quad and connected to the computer and there's no lights flashing on whatsoever. Computer *does* register the usbserial port but I can't connect to it. The board then gets hot to the touch in the area around the usb port. What's that, a short-circuit or borked chip somewhere? There's no visually burnt-out components on the board and no funny smell either. I fly with the noisy LittleBee 30A ESC's but have a 1000uF cap on the main power loop, which should help with that. After crashing I immediately checked motors and ESC's and they weren't even warm to the touch. No funny smells.

Things I changed recently:
- upgrade from Betaflight 2.8.3 to 2.9.1.
- started using superexpo but with relatively low rates (0.2 if I recall correctly)
- added an OSD for the first time, but with some troubles (see http://intofpv.com/t-losing-fpv-signal-w...-manouvres)

  - on this flight I had resoldered the video signal to go directly to vtx and bypass the osd, but keeping the osd connected to power.
  - I haven't checked if the OSD still works since this crash (.. relevant?). No funny smell there.
- changed gyro/pid looptime to 2kHz/2kHz on a whim. This is kind of high for a f1 chip but I was just curious.

Personally, I'm suspecting the high looptime to have over-stressed the cpu but I don't actually know what happens if the FC is overloaded. Hoping for some ideas from you.  Thanks!

i don't know if it's CPU overloaded, but i think the chance is small. It sounds like a damaged 3.3V step down voltage regulator? Things do break over time, randomly, and I would blame back luck really unless someone else has a different theory

Have you tried to connect +5V on the other line ? (new connection) just to check?

You mean on like one of the servo pins instead of the USB port? If so then yes, I tried it there too. In fact, during the flight I was powering the board with a BEC on one of those servo pins.

> Computer *does* register the usbserial port but I can't connect to it. The board then gets hot to the touch in the area around the usb port

I had that happen with a brand new Naze32 after a crash. There was no obvious physical damage but turns out a chip fried and the thing was completely dead. The "gets hot to the touch" part is exactly what mine did.

I had the same problem with my first Naze32 but I did crash at full speed into the floor. I ended up having to replace it as I couldn't figure out what was wrong.