Overvoltage on the OAK-D

NicoLongchamps

Hi, our OAK-D broke due to overvoltage from the barrel jack. Initially, I thought only one part might be damaged, so I attempted to repair the board. Upon inspection, I noticed that the ideal diode (U9) was fried (using a thermal camera), so I replaced it. The 5V rail was restored, but then I discovered that the LDOs for the 3.3V, 2.8V, and 1.8V were also fried. Additionally, the 3.3V and 1.8V traces were shorted to ground (GND). While investigating further, I observed that the zener diode for input protection was unpopulated. Is this because the base board becomes nearly unsalvageable after an overvoltage incident? Did I overlook any design aspects that could cause the short to ground? Lastly, if the IMU is the source of the electrical short and I remove it, would the board be able to function properly without it?
Thanks!

erik

Hi @NicoLongchamps ,
We have accidentally plugged one OAK-D onto 12V and fried it. We quickly looked into schematics (here) and realized it's not worth the effort. So in short, we have never done this, so we can't suggest you much.
Kind regards, Erik

NicoLongchamps

Is it normal that the circuit protection (Zener diode - D6) is absent from the board? Because the docs doesn't mention anything and even the revision history mentions the input protection specifically for the barrel jack here

erik

@NicoLongchamps I remember this only vaguely, but I think that zener diode didn't entirely protect the whole board (it wasn't fast? not sure) so we just removed it in future revisions. I know we tried to replace that diode but that didn't fix the camera, IIRC SOM was fried as well.