So I got a good deal on an as is, pre-owned max neo… I got it put together, and everything looks great! Like brand new! I turned the power on, and the switch lit up, and the fans came on, but the display didn’t even flicker! No lights on the motherboard, and no movement. So, I thought I might try printing directly from cura, and plugged in to the front of the machine. When I plugged in the micro USB cable, the board lit up, the display lit up, and so did the filament runout sensor, and the touch sensor. I got all excited, but I can’t get it to do anything! I can scroll through everything, and click on anything at all, but nothing does anything! It just says, after a few minutes of trying, that home failed, or heat failed!! As soon as I unplug the cable, everything but the power switch and cooling fans go dead! Nothing on these machines are super expensive, but I don’t want to have to replace every single piece on it, to figure it out! I’m guessing probably motherboard… Please, anybody help!! I really need my printer!!! Thanks in advance!!
Hello Adam_Filyaw,
Do you have access to a multimeter ? And are you safe using it with power on the printer ?
Check the voltages from the power supply on the motherboard.
I am guessing it may be due to a power supply problem. ( a missing voltage)
You may need a printout of the connections of the motherboard showing voltages expected.
Cheers.
I do have a fluke, and yes, I’m comfortable using it with the power on. And when I realized that the display, and other components came on with the USB connected, I thought that those components weren’t getting any power normally, but were from the USB. Just wasn’t sure where the issue was. I was checking out the board, before I powered it up, and was shocked to find that every single terminal was loose, and the wires were falling out! I did tighten them though. I hope that didn’t fry something! Also, does it actually mean much if the green light is on, on the power supply? Because it is on. Where can I get a printout of the wiring on my machine? One more thing… Just for testing purposes, any way, with the correct firmware, would I be able to use the motherboard, and or the power supply, from my working regular ender 3? And thank you so much for the help!!
so… Everything is definitely getting power!! Every single wire in the ribbon cable to the display also has 24v instead of 5v!! That’s why it’s not working!! Now why is the question… Is the chip on the motherboard fried? And in that case, new motherboard??
Hello,
Not knowing the motherboard it is not easy to say … but …
Generally, the power supply creates the different voltages required for the motherboard.
These voltages can be 5volts plus 12volts plus 24 volts etc.
There are cases where the 5volts is generated from 12volts ON the motherboard rather than simply from the power supply.
What is first needed is a diagram showing the connections to the motherboard from the power supply . Remove the connections from the power supply and check the voltages it is supposed to produce.
This is being said with the hope of not paying for a new motherboard only to have it also fried by a faulty powersupply.
Cheers.
Where can I get the diagram? Can I get it from the creality website? Thank you!
I looked in to the power supply, and it’s a single output voltage supply, which means it’s only 24v out. And it checks out. I’m assuming the board has to have a chip that drops it to 5v… Is there any other thing that could cause it to have 24v on the display cable?
Hello Adam_Filyaw,
Since you say that only 24 volts comes from the power supply to the motherboard, then the 5 volt supply is generated by a regulator on the motherboard itself.
It would be safe to assume that a new motherboard is needed.
I would guess that the 5 volt regulator has a short. (likely repairable if you know electronics).
Cheers.