Today I plugged my FOCBOX into my computer and then powered my FOCBOX with a battery. The FOCBOX then didn’t turn on while it worked 5 minutes before.
After reading a bit around here I took these measurements:
Measuring 5V on UART port: 5.12v
Measuring 3.3v on UART port: 0.3v
When I put my multimeter in “check” mode and short the leads: 002
Measuring C25 on one end to ground (of can port): 008
Measuring C25 on the other end to ground (of can port): 002
Is is a single motor setup, so no connections through the CAN port. No lights on at all, except the one on my receier that gets 5V through thr COMM port. And I don’t think it’s under warranty.
You can remove the canbus chip and it will either work or it won’t but if it was the chip that was causing the issue then the focbox will be alive again. The can bus chip won’t affect anything else or make things worse except linking another via can bus.
It could be any number of things to be honest but as i said it is behaving like a focbox with a blown can bus chip. No lights but still retaining the bec voltage. Its also something you can do yourself with a small pair of side cutters. If you want it repaired then there are a few guys that offer that service here.
I believe @Martinsp does focbox repairs in europe very reasonably priced.
I brought 2 back to life by removing the chip. It was a failing on the earlier versions of the focbox but they fixed it just before discontinuing them lol
Wait till one of the real experts chime in before attacking it though.
If you disconnected power to one vesc while the can bus was connected it blew both chips. If you removed the can bus cable while powered up it blew one. I did it trouble shooting a seperate issue and blew both. I just use split ppm now.
But that doesn’t mean it can’t just fail on you. I can only go on what the symptoms are without a good look at the board. Most other common faults display flashing lights although my focboxes have always been good in that regard.
I’m the sort that would have snipped them off by now because its already bricked and what have you got to lose? But thats just me lol
and you are very welcome just sorry I couldn’t have been more helpful.