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Re: Sort of kinda accidentally set my printer on fire.

Posted: 12 Nov 2018, 18:56
by DomingosRodrigues
Hello rgjeppesen,

What parts have you replaced? I suspect the motherboard and the stepper drivers/fan, what about the LCD? there a big possibility that when the board got fried the lcd screen went the same route.

Have you measured the output from the power supply, is it a stable 24v?

Another real possibility is that you have reversed both the LCD cables either in order or in orientation, double check those. that would cause the non stopping beeping.

Also what firmware are you using right now? Be sure to use the latest version available here without any changes:
viewtopic.php?f=8&t=719

After you try these please report back.

Re: Sort of kinda accidentally set my printer on fire.

Posted: 14 Nov 2018, 21:45
by rgjeppesen
I have replaced the Motherboard, all stepper drivers, the Y-stepper (it froze), both cooling fans for the stepper drivers, the power supply, the lcd screen.

I have not measured the power supply output, but I can check that.

I thought maybe I had the cables reversed, but I double checked them and they looked right.

I think I downloaded the latest firmware, but I might not have.

Other things of note, I bought a MKS Gen V1.4 instead of the original V1.2 and I also got the A4988 drivers instead of the DV8825, though I do have a new set of those too.

Can someone give me a direct link to which firmware I would need? I am really bad with firmware and have almost zero experience.

Re: Sort of kinda accidentally set my printer on fire.

Posted: 15 Nov 2018, 13:30
by DomingosRodrigues
Hello rgjeppesen,

the firmware you need is the one I linked on the previous post, you just need to edit the configuration.h file, and uncomment (Removing the "\\" before the line of text) the correct line for your stepper driver:

- Line 68 if you only use A4988 on the extruders (two bottom stepper drivers)

or

- Line 71 if you have all 5 A4988

Save the edited file, then follow the instruction on how to install the firmware (there is a pdf on the page I linked on the previous post)

Can you please share the links o the components you ordered, that is in case you did not order from Beeverycreative as there are some clones of the same LCD that helloBEEprusa uses, or even some version of MKS gen 1.4, have the connectors for the LCD reversed (the orientation notch in on the wrong side), causing the problem you mentioned, there is an easy fix but I need to be sure before I can try and help you. If possible post a photo of your board and LCD so I can verify the LCD output and input have the correct orientation.

Re: Sort of kinda accidentally set my printer on fire.

Posted: 16 Nov 2018, 03:06
by rgjeppesen
Here is the screen I bought:
https://www.amazon.com/gp/product/B01FL ... UTF8&psc=1

The Mainboard:
https://www.amazon.com/gp/product/B0756 ... UTF8&psc=1

Stepper Drivers:
https://www.amazon.com/gp/product/B0166 ... UTF8&psc=1

I will try messing with the cables and then your recommendations for the firmware too, but I won't be able to mess with the printer until Sunday, stupid work...

Re: Sort of kinda accidentally set my printer on fire.

Posted: 16 Nov 2018, 11:39
by tgala
As @DomingosRodrigues said previously, that looks like an LCD cable issue!
I don't know why they did it but I think the LCD connectors on the motherboard changed orientation from MKS GEN V1.2 to MKS GEN V1.4.
On one version, the pastic notch is torwards the inside of the motherboard, on the other version it points outwards.

Can you check that?

Re: Sort of kinda accidentally set my printer on fire.

Posted: 19 Nov 2018, 16:45
by DomingosRodrigues
Just to clarify what Tgala said a little more here's a photo comparing the lcd plugs on mks gen 1.4 and 1.2,
Image
as you can see you will need to cut the small notch on the cable like shown here
Image
then connect it as if it was connected to a mks gen 1.2, with the notch you just cut facing the top of the board.

Re: Sort of kinda accidentally set my printer on fire.

Posted: 21 Nov 2018, 17:39
by rgjeppesen
It looks like that was the main problem. I cut off those tabs and reconnected it, and that has solved most of my problems. The screen works, the X and Y axis seem to move right, the Z is a little wonky and I still trying to determine if the extruder steppers are moving right. But progress is being made

Re: Sort of kinda accidentally set my printer on fire.

Posted: 23 Nov 2018, 14:31
by tgala
Nice! Let us know how it goes.

Re: Sort of kinda accidentally set my printer on fire.

Posted: 26 Mar 2019, 14:15
by rgjeppesen
I have finally made some progress on my printer. I decided to order the original version of the board and then it took 2 months for it to ship from Hong Kong, grrr. But it is in and installed and I have a working printer, kinda. I am still having three problems I am hoping for help with.

A) Fan on Extruder 1 which should always be constantly on isnt. It is twisted in with the wires of the other constand on fans. I am guessing it is dead and needs replaced. This shouldnt bee too much of an issue, I just cant use E1 unril that is fixed.

B) Heated bed begins heating as soon as I turn the machine on and finally levels off at about 123C, which is not great for printing PLA. The screen shows a temperature of 123/0. I have tried setting the temperature to something lower like 50, and then it says 123/50. Is this a firmware or a hardware issue do you think?

C) My Y-axis sensor works, red light comes on and everything, but when I autohome, or begin a print, it ignores the signal and keeps grinding the motor to the left, past when it should stop. I have tried swapping it with the x-axis switch and I can command the x-axis to stop, but not the Y. I have also tried a couple of different configurations, like trying to plug it into Y+ on the board instead of Y- and that didnt work either.

Re: Sort of kinda accidentally set my printer on fire.

Posted: 26 Mar 2019, 16:23
by DomingosRodrigues
Hello rgjeppesen,

Good to know you are making advances in recovering the printer :)

As for the problems, double check if everything is correctly wired, on the bed and on the endstops, according to the manual, if possible post a picture here for a double check.
If it is correctly assembled, it appears your board has 2 defects:
- A defective Hotbed Mosfet that is locked on the ON position, it can be replaced but it is a little hard to do without a hot air station
- A defective endstop input that can't read it's correct state.

As a extra check try connecting the Y endstop to the X axis and vice versa and check if the result changes.

Best regards