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.
Hello, almost the same problem on the same board. I want to charge my battery. I read the instructions on Quick start guide and it says “The charger circuitry can be connected to a wall outlet charger through the Type-C USB connector”. So i connect my cell phone charger to the wall outlet, connect it to the board and i also connect my (new) battery to the board. My charger says output 5V 2.0A 10.0 W. Then the heat goes up very fast, almost burns my fingers so i unplug it. What am i doing wrong? Maybe the Amps output is higher?
Welcome to RAK forum @hercules ,
The polarity if your battery is wrong.
You can check on the quick start guide the polarity of the battery connector.
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Thanks a lot!!! Your figure with the pin order helped me!!