MKS Base Reverse Polarity Repair

About: I am 21 years old, hard working and excited about doing stuff around technology. I fell in love with technology at the age of 7, where i started taking my dad's tools, and opening every device in the house ...

I was up all night, and decided at 5 am to fix my Printers input, because it had broken a few days ago. So I replaced the connector, but confused the polarity, yes I know, clever me, and I broke the board.

It wouldn't work from the power input, but it still would work from a USB, the motors wouldn't work of course.

My board was MKS Base V1.2

Sorry for the quality of the pictures, my phone has 5mp only with no manual focus and terrible autofocus.

Step 1: Step 1. Check the Fuse

Check with the continuity function of your multimeter across the F3 Fuse (near the power input)

If you have continuity continue to the next step.

otherwise replace the fuse.

Step 2: Step 2: Replace the Regulator

Disolder the regulator, clean the pads, and make sure you don't have any short circuit.

Solder a new regulator (L5970D) make sure you don't have any short circuits between the pins of the regulator.

PS: Be careful the resistors and capacitors next to the regulator so that you don't disolder them. I had to fiddle with R5, because I wasn't careful.

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15 Discussions

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pt.marcelo

16 hours ago

I don’t know what happen in my case, but the TFT35 still working, starting etc.. but the board MKS base 1.6 don’t answer... no preheat, no home, no movement.. I don’t know if is in the TFT35 or in the board, everything start with bad connection in the FAN... and it’s like there is no communication between board and screen, I tested everything, change the baudrate, reinstall the firmware etc.. everything... I think is in the board but itlook like everything is ok but no work. When I try to start preheat, the temperature shows 0/0 .... before was th ambient/0 like (29/0) please anybody with in any information can help..

2 replies
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atanasovgoranpt.marcelo

Reply 14 hours ago

the thermocouple would explain the preheat, not about the movement, did you change the pots? Did you check your cables? Can you test different motors and/or boards with these motors.

(I come from a pc repairing background, so I work by elimination, sorry I couldn't be of more help)

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atanasovgoranpt.marcelo

Reply 14 hours ago

Did you try replacing the Thermocouple?

My display is driven directly by the micro, so if there is output is not the power delivery, however I am not sure how the TFT ones work, I would simply change the thermocouples to eliminate it as an issue, but not sure how else I could help you.

If it is actually your board just replace it with a Bigtreetech SKR V1.3 32-Bit control board (20USD without the stepper drivers)

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kyoday

1 year ago

Hi, I have a MKS GEN v.10 biqutreetech . after wrong polarity connection is dead... one diode burn.. i have change two diode but nothing.. one fuse ok but another no.. what is the valor of these fuse? 15 is 15A ??

mks.png
2 replies
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pt.marceloStefanM46

Reply 16 hours ago

I’m sorry, I have just simple question, if have trouble with the polarity or bad connection in the fan cinecto 12/24V, can damage the board? My MKKS base 1.6 start end look like working but not responde the TFT35 comanda and it was after feel like the screen stop when I cine the the fan... can you help with some opinion

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Lipigl

Question 1 year ago on Step 1

hi! I need to change the fuse labeled '15'. do you know its parameters?

2 answers
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StefanM46Lipigl

Answer 1 year ago

15 Ampere. Now you should measure the dimension of the fuse for buying a new one. i see this on ebay also.

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atanasovgoranLipigl

Answer 1 year ago

Hi Lipigl, I can't find F15 could you send me a photo marking it?

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Lipigl

Question 1 year ago

Thanks for helping!

It's not F15, it's a fuse with the number 15 on it. I'm using the MKS Gen L and I messed it up by reversing the psu polarity. I was hoping the fuses would be similar in your board.

20180410_202642.jpg
1 answer
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atanasovgoranLipigl

Answer 1 year ago

I am sorry but I don't know which fuse it uses, and they still haven't published schematics and BOM "Open Source" my A**.

But according to reprap Wiki it is a remix of Arduino mega2560 and RAMPS1.4.

And according to the photo you send the fuze 15 is actually fuze F2 on the board,

on ramps F2 fuze is a ressetable PTC fuze that is guaranteed to not trip at 11Amps and guaranteed to trip at 22Amps and maximum voltage of 16V. But since the MKS claims to work on 24V that wouldn't work. I did a quick search on digikey (I am not sure if the fuze is an 0603) but there where options at 24V for 15A (which I guess the number 15 means) I couldn't find one for 32V as a buffer. Sorry I can't be of more help

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LT_WANG

3 years ago

MKS Base V1.1 - Does it look like I should replace the Fuse?
My multi-meter has no continuity setting; any idea what resistance should I be looking for over f3?

WP_20160315_02_20_23_Pro.jpg
2 replies
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atanasovgoranLT_WANG

Reply 2 years ago

If it is a fuse, there should almost no resistance.

Sorry for taking so long to respond, I just logged in after almost a year

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atanasovgoranLT_WANG

Reply 3 years ago

A fuse, it should have almost not existent, resistant, like a piece of wire.

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seamster

3 years ago

Good info, thank you for sharing. And welcome to instructables!