New Original Prusa i3 MK2 - Nothing on Power Up  

Re: New Original Prusa i3 MK2 - Nothing on Power Up

Hi Marcus

The following suggestions may sound rather obvious, but we have to start troubleshooting somewhere...

The RAMBo can be powered from the USB, so ability to update firmware is not much of a clue.

Firstly, can you please check that the PSU is set to the correct voltage for your supply. The voltage switch is usually offset, so switch it the other way and back again if it "looks" correct.

Then, can you please check that the power connectors from the PSU are in the correct power input sockets on the RAMBo. Many users have plugged the power cables in to the heater outputs and vv.

Can you please also check the 3 fuses on the RAMBo with a continuity tester if you have one; a visual check is not always good. There is also a fuse on the power inlet of the PSU, just above the socket, molded in the same black plastic; check that one as well.

Can you then please upload a couple of photos of the RAMBo and the connections you have made and one of the back of the LCD panel with the ribbon cables connected.

Thanks

Peter

Re: New Original Prusa i3 MK2 - Nothing on Power Up

Thanks for your response Peter!

I flipped the voltage switch from 220V to 110V, I also did what you said at some point and toggled the switch to 220V and back again.

The 12V power supply connectors are indeed connected to the RAMBo as indicated here and not the heater and vv outputs:

I am currently at work and will check the fuses and send some pictures when I get home in an hour or two.

Thanks so much!

Re: New Original Prusa i3 MK2 - Nothing on Power Up

Marcus

The important thing for you is to have a completely open mind about everything. It is all too easy to get your mind set on everything being spot on - I know, I have done just that!

Peter

Re: New Original Prusa i3 MK2 - Nothing on Power Up

Marcus, when you connect powered-up printer to PC with Pronterface, does the printer response to movement commands or temperature commands set from Pronterface? If you didn't try, try this, stop at first failed step:
1. Power the printer on, ignore dark LCD (or better, disconnect it first)
2. Are Z motors powered? You should not be able to turn Z screws by hand easily.
3. Try to connect to it from Pronterface. It should work as well as firmware upgrade did.
4. Click on controller of X axis to move it to right by smallest step (0.1mm or 1mm). Does extruder move?
5. Try to set target temperature for bed to 40°C. Does it work? (LED on bed should go on and the bed should become warm)
6. Try to set target temperature for extruder to 55°C. Does it work?

If all steps above passed, the problem is in LCD only. It is either dead or you connected it wrong. Unfortunately, you will not be able to do selftest and XYZ calibration without working LCD.

Re: New Original Prusa i3 MK2 - Nothing on Power Up

I can confirm that all fuses on the board are fine. I will check the PSU fuse as soon as I get a few minutes to disassemble it.

Here are some pictures of the board:

http://imgur.com/jMWDyKd
http://imgur.com/Ckdc6WS
http://imgur.com/2DIco67
http://imgur.com/1vB81ps

Sorry for the low quality, kind of a difficult angle to get into. Hopefully you're able to see all of my connections.

Thanks for your response also David, It appears that the Z axis motors are powered, They are very difficult to move by hand. However nothing else you suggested is working... 🙁

Re: New Original Prusa i3 MK2 - Nothing on Power Up

I just confirmed that the PSU fuse is fine. I also checked the 2 output pairs from the PSU and they're both delivering 12V. I'm very confused now. 😕

Re: New Original Prusa i3 MK2 - Nothing on Power Up

Marcus

I checked your photos and all seems to be in order.

I think that your best course of action is to contact support - use the "Live Chat" on the shop pages and give them a link to this thread.

Peter

Re: New Original Prusa i3 MK2 - Nothing on Power Up

Thanks for your response also David, It appears that the Z axis motors are powered, They are very difficult to move by hand. However nothing else you suggested is working... 🙁
If Z axis motors are powered, it means that the control board has booted and firmware has started. "Nothing else working" means that you even didn't manage to connect the printer with PC via Pronterface? What did it exactly do?

Re: New Original Prusa i3 MK2 - Nothing on Power Up

Thanks Peter, I will give that a go.

David, whoops, I could have made that a bit clearer. I was able to make a connection using Pronterface, however, it's either unresponsive to commands, or I don't know how to use Pronterface. This is what my Pronterface console looks like:

Re: New Original Prusa i3 MK2 - Nothing on Power Up

or I don't know how to use Pronterface. This is what my Pronterface console looks like:
OK, your Pronterface is definitely connected. You can command it to move extruder head a bit by clicking into direction circles, the more off-center means bigger step (or distance). Click on +X at 0.1 or 1 mm (see red dots in image). Does it move or not?

Re: New Original Prusa i3 MK2 - Nothing on Power Up

No response to clicking any of the buttons. 🙁

The yellow status LED on the RAMBo blinks whenever I click one of the command buttons in Pronterface.

Re: New Original Prusa i3 MK2 - Nothing on Power Up

Not good. It seems that dead LCD is consequence of some other failure.
One last test before you finally contact PR support.
Disconnect all components but input power and flat LCD cables from miniRambo. Double check that both input power cables and LCD flat cables are connected with correct polarity. Switch the printer on. If the problem is in one of disconnected components, the display should come up and you should see ERR MINTEMP (disconnected temperature sensors cause this).
If it don't work even with components disconnected, it is either dead miniRambo or dead LCD.

Re: New Original Prusa i3 MK2 - Nothing on Power Up

Yeah... I fear it's the mini RAMBo, I will try what you've suggested when I get home. I tried disconnecting everything but the servos, input power, and LCD connectors and the symptoms were the same. I can try disconnecting the servos as well but I don't expect it will make much of a difference. I'm not sure why the mini RAMBo would be dead, it checked out OK before it left Prusa, and I took great care when assembling the machine. Do you think Prusa would replace it? Was hoping not to replace a $120 board. 😯

EDIT:
As I suspected, the symptoms are the same when only input power, and LCD are connected.

Re: New Original Prusa i3 MK2 - Nothing on Power Up

I initially had similar, on a machine delivered about the same time - I got mine 19 Dec.

I assembled and got nothing on power-up. Redoing all connections at the rambo and double-checking solved nothing. PSU seemed to be OK. What solved it for me was unplugging and replugging the ribbon cables from the LCD. I have no idea why this worked - I took the cables off and put them back exactly the same, then when I powered up again it was ok.

You mention trying different combinations of ribbon cable connection, but have you tried unplugging and replugging at the LCD end, not just at the rambo end?

(I must admit, it seems unlikely that this will solve your issue, but I guess you're willing to try anything. I didn't try pronterface, but otherwise my symptoms matched yours).

Re: New Original Prusa i3 MK2 - Nothing on Power Up

Yeah, I wish it were that simple. I tried that and no dice. I appreciate the suggestion though. Glad you got yours up and running!

did you resolve the problem i have problems like you

Finally after 5 weeks of waiting, I got my Original Prusa i3 MK2 kit 2 days ago, this is also my very first 3D printer. I spent all day yesterday joyously assembling it, until I finally at midnight, I closed up the electronics panel, plugged it in, and hit the power switch. To my dismay, Nothing but a couple of LEDs came on. 🙁 I spent the next 2 hours reading forum posts, flipping LCD connectors, and other various troubleshooting. Somewhere along the way I read something about a green LED on the power supply and the Rambo board, the LED on the Rambo is on, but not the one on the PSU. I'm not sure if the PSU may be defective or I broke something since it never turned on in the first place, either way, I have a replacement already on the way just in case. However, it does appear that the board is getting power, the PINDA probe is also illuminated red. It is not apparent whether anything else is getting power. The status LED (yellow one), blinks a couple of times when it powers on and then turns off. I was able to hook it up to my PC, install drivers, and update the firmware. I'm assuming this means the board is not fried somehow? As for the LCD, I've tried swapping cables, flipping cables. I've tried just about every possible permutation of plugging in the cables and currently they are plugged in with the red stripe at the top, with cable I connected nearest the case, and cable II furthest from the case. As far as I can tell from diagrams, this is correct. I get nothing on the LCD, it doesn't illuminate blue, there's just nothing. I would greatly appreciate any help anyone has to offer. Thanks ahead of time. 😀

Re: New Original Prusa i3 MK2 - Nothing on Power Up

i have the problem like you how you resove it please

Re: New Original Prusa i3 MK2 - Nothing on Power Up

i have the problem like you how you resove it please

Prusa kindly replaced my mini RAMBo board and my printer now works like a charm. 😀 I would contact Prusa over their chat or email support!