Hey,
I installed two tmc2208 for Z and extruder and two tmc2209s for X and Y axis yesterday in UART mode. I made sure the drivers (made by Bigtreetech) were inserted correctly, checked the DIR and EN pins and all. Infact, I quadruple checked.
Since my Arduino's onboard 5v regulator is fried, I use the USB's 5v to trigger a relay in my PSU (Not an ATX). Upon connecting the USB cable and then flipping the PSU switch, I heard a loud pop and the printer reset. The printer display was very dim and was not showing any characters, only backlit
.
Me still being in denial about the noise, thought maybe something else is wrong. Turned everything off, and tried to smell for smoke near the board and PSU. Nothing. I took the drivers out and inspected both the chips under my usb microscope. Aaaaand yep, both tmc2209 had a hole in their chip. tmc22
08 are completely fine and working. I switched to my old tmc2100 on X and Y and I have no issues there.
Edit: I think I should also mention that I tried one tmc2208 in standalone mode on Z axis first to make sure everything was okay. When I turned the printer on with only a tmc2208, I noticed that the Z motors became active as soon as printer was on. I know this because I have a board cooling fan that only turns on when motors are on. This didn't happen with A4988 that was on Z before.
I cannot for the life of me figure out what went wrong and why these two fried. The only possible clue that I have found is this:
https://github.com/MarlinFirmware/Marlin/issues/10162#issuecomment-397844847
No idea if what was said there is true or not. I do know both tmc2208 and tmc2209s are 3-5v logic, according to Bigtreetech specs. If the github post is the reason, why didn't tmc2208 fry as well?
I want to order more tmc2209s but I don't want them to fry like this again, so could someone here help me figure out what went wrong please?
Edited 6 time(s). Last edit at 04/29/2020 10:41AM by White.Renard.
