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bigtreetech / BIGTREETECH-SKR-V1.3

32bit board with LPC1768, support marlin2.0 and smoothieware, support lcd2004/12864, On-board TMC2130 SPI interface and TMC2208 UART interface no additional wiring is required
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SKR 1.4 Turbo - Dead Mosfet? #400

Open skappers opened 4 years ago

skappers commented 4 years ago

Hi Github community,

After fixing the short in the board with the TH0 terminal by swapping terminals THO and TH1 around in Marlin, I am now experience an issue with my hot end instantly hitting up as soon as I switch the power on.

I have been doing some reading and this can happen if the thermistor is short or the heat cartridge is dead but I also saw that this could be because of the Mosfet's shorting as well.

How do you go about testing Mosfet's for shorts? I have tested the voltage output for terminals for HB1 and HB0 respectively and neither is outputting 12V when I turn on the machine so I assume the issue is at the hot-end.

Am I testing the Mosfet's correctly and if they are short, does anyone know where to get replacements for the skr 1.4 turbo board?

Thanks

lextc commented 4 years ago

Same problem here. But mine is a little different.

Last night I just finished setting everything up. extruder calibration, steppers calibration, PID tuning for both Bed and head, and started printing. After a while, I got a thermal runaway alert and the printer... Didn't stop. The head temp kept on rising, and I had to trun it off after 285C. When I tried to power it back on, the head temp keept on rising. I quit and left it overnight. Now, after trying again, the head dosen't heat but the bed is always on and heats by himself.

radek8 commented 4 years ago

If you don't dare solder a mosfet, you can use an external Mofset and switch it with the pin that went to the original mofset.

https://www.aliexpress.com/item/32816837677.html?spm=a2g0s.9042311.0.0.27424c4deDO57A

lextc commented 4 years ago

I ordered a new board, the mosfet was ok, the gate cip was fried.