Help!
I’m no my second 19007 board form use with LoRa 4631 module. Both times my board has worked fine and I have been able to flash Meshtastic firmware to the board via my computers USB port. But after a couple of weeks when going to update the firmware the board when plugged into the PC produces magic smoke and a component on the bottom burns out. The second board and the second time it happened I was able to get the attahed picture. I was almost expecting this to happen same as last time. I attached a bear board with only antennas connected, and of course the component got red hot and burnt out. Has anyone else had this happen? I have another RAK 19007 board with a 4631 module happily chugging away up in a solar node on my roof and never had this issue when I have had to reflash firmware on this computer. How do I go about rectifying this?
Welcome to the forum @Soupbones
The component that is “burning” is D3, a zener diode that limits the incoming voltage 5.6V (upper limit of the charger chip).
If that diode is failing, it means there is a voltage much higher than 5.6V coming from your USB connection.
