Then hopefully I can send mine to David to be repaired
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Great news, David says he can fix them for free and I just need to cover the shipping!!! What a life saver! I have to say that their tech-support is awesome! They’ve always gotten back to me quickly, and have always been very helpful.
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Be amazing if they could design them to function properly when powered on seperately. I’m still perplexed why my board has been fine powering escs on seperately and others haven’t???
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Yeah this isn’t that difficult to do, even was fixed on the OG focbox.
Canbus blown on 2x D75 here, simply from powering them off within a second of each other.
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Did you get them fixed? David’s fixing mine and I just need to cover the shipping.
If I can get the enclosure cracked open I’ll just fix them myself.
It’s easy to get into
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Not at 2am it isn’t. 
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@YUTW123 are you guys interested in fixing your canbus interface design to prevent this from happening?
Does your currently offered fix involve simply replacing the same canbus transceiver or have you selected a new part?
I can point to two design examples of fault-tolerant canbus implementations, with schematics, if that’s helpful.
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What would the changes need to be to protect from this failure mode? Looking at playing around with canbus in the next month and I’d rather not accidentally fry my D100S
It’s hardware level, I think they basically need to hunt down any path for power to backfeed through the CAN lines. I’d be very surprised if it didn’t require a different PCB
For some reason my M100s haven’t had this problem (I didn’t know it existed for quite a while and have powered them on separately with CAN still connected). But this is not an endorsement that the M100 is safe, it could be something inadvertently saving them in my specific serup
Powering them on however you want isn’t the issue
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Right, I figured that would be the case; what I’m asking is: what hardware changes need to be made to resolve this in a future production run? I really like the MakerX VESC’s however if they are going to bork in weird ways when you have stuff hooked up to CANBUS, they aren’t a good option in my book; I’d like to see such issues resolved. Blowing the CANBUS transcievers means your dual ESC becomes a single ESC. Having this happen while you’re out on a ride could even be a safety issue since you then have to ride home on one motor at half the power/brake force and traction.
Did anyone ever take you up on your offer?