This issue with getting defective boards is killing my drive to continue working on my printer. This is now the 3rd dead board, all are dead drivers… 1 was a board meant to for RMA with a blown driver, but I got it instead. The printer hasn’t event printed at all.
its a confirmed grenaded driver. nothings shorted. Z motor works on every other driver.
Ill clarify the first board shit itself within 60 seconds, the seconds was a screw up being a pre blown board. This recent board barely has 10 hours being powered.
They are legit duets. I HIGHLY doubt wiring shorts are the cause. The duet team has stated they’ve had blown driver issues… the second board was from another customer which was mistakenly sent to me…
I do not see the Sense resistors on these boards. They should be 2w resistors used to control the current to the drivers. If the Sense resistors are an SMD type, they are then too small to survive any stall currents, and will damage themselves and the drivers. Stall currents are the electrical feedback that happens when the stepper motor stops or stalls while the electronics continue to operate it.
Ouch. Sorry to hear that. I’ve got a couple Duets with those drivers and mine seem fine so far. The most recent print run was 24hrs. I use them to run NEMA23 motors at the full current they let those boards go (2.4A).
seeing a lot of people blowing up smoothies and duets on first builds … i think a better path would be to get the printer running on cheap ramps boards and then migrate to these boards!.that way u can blowup a ton of a4988s even if you make mistakes and it wont blow a hole in your wallet…
@Jordan_Bourns those are gonna be quite tough to desolder with a hot air iron. I have trouble getting small FET’s to reflow with lead-free solder, let alone something that large.
They aren’t willing to replace it? And is it the same exact driver every time?
Also, any chance you are willing to sell one of the blown ones??