Closed FauthD closed 1 year ago
Look like this is the same issue as this: V2 board starts burning when attempting dfu mode #26.
I measured the Q7 turns on the heater, voltage at R38/R40 junction is zero. The Raspberry was not connected for this test. Q7 gets very hot.
If MKS reads here, can you provide the Q7 and tell which are the correct values for the resistors please?
R38 100 Ω,R40 100kΩ,Q7
Look like this is the same issue as this: V2 board starts burning when attempting dfu mode #26.
I measured the Q7 turns on the heater, voltage at R38/R40 junction is zero. The Raspberry was not connected for this test. Q7 gets very hot.
If MKS reads here, can you provide the Q7 and tell which are the correct values for the resistors please? R38 100 Ω,R40 100kΩ,Q7 HYG024N03LR1D TO-252
Hi, The official MKS-Shop at Aliexpress provided me with the correct transitor (I had to pay 1.08€). Thanks! Replacing it was not too bad with my cheap hot-air station. Better would be some heating underneat the board, but it worked out well. Now the board works fine again.
Trying to find the root cause did not expose something:
So I cannot explain the issue, though I do not believe it was pure coincidence. I recommend to disconnect the heater bed while DFU, or just use the USB supply.
PS: I think R40 is only 10K, not 100K as MKS-hosiey mentioned.
Regards, Dieter Fauth
Solved and close. (second try to close)
Hi, with FW mks_monster8 v0.10.0-557.bin my Sermon D1 worked just fine regarding the bed. Since the neopixel did not work properly (looks like a timing issue), I tried the latest FW compiled locally. Did a make menuconfig and double checked the values agains the readme.md. Compiled with
make clean
followed bymake
. Then flashed withmake flash FLASH_DEVICE=/dev/serial/by-id/usb-Klipper_stm32f407xx_39003E001250304B56333920-if00
(Stopped the klipper service for this).Now the bed gets heated right after reboot until the emergency shutdown occurs.
Do you know about any changes that could cause this?