UM2 is dead after short circuit.

[shurik 87]

Disconnect the motor to see if at least goes on?

No more that weak noise and clicks. The yellow light still blinks.

Otherwise, all the same. :-(

Edited March 15, 2017 by Guest

[neotko 1,417]

You haven't left the fan connected right? I mean, most probably is dead? So all unplugged and remains the same?

[electromu 364]

Cura 15.4 agrees to start the firmware installation but almost immediately fails with error message:

Failed to install firmware:

This firmware is not compatible with this machine.

Trying to install UM2 or UMO+ firmware on an UMO?

 

I already had this error with an aliexpress motherboard.

With cura 15.4 I choose "instal a custom firmware" and I select the file MarlinUltimaker2.hex which is in the installation folder cura / resources / firmwares

And it works for me

Edited March 15, 2017 by Guest

[shurik 87]

You haven't left the fan connected right? I mean, most probably is dead? So all unplugged and remains the same?

Yes... I tried to unplug some other things, all with the same result.

 

And it works for me

Yes, that way the firmware update worked. At least, from Cura's point of the view. It didn't help my poor printer, though...

[shurik 87]

So I gave the printer to our local dealer who also has a good lab.

In addition to the board, they also replaced the display's board, the flat cable and for whatever reason, the fans.

Now my printer works!!!

They also confirmed that the old board is dead, indeed.

Once probably last question - the new board came without the metal holders into which we should screw the four holding screws, like this one, on the old board:

How do I attach those? They seem to be firmly attached to the old board.

[neotko 1,417]

There's a printable version I think

[neotko 1,417]

https://www.youmagine.com/designs/printed-spacers-for-ultimaker-2-pcb

[shurik 87]

The description says:

 

These are designed to fit over the soldered spacers...

So I need to find a way to fasten these "soldered spacers".

[neotko 1,417]

It should work with a clip design and 100C+ material (t

[shurik 87]

At the end, I found some screws long enough to fasten the board with nuts.

My printer works again.

Thanks for everyone who tried to help, I do appreciate that.

[Alexjwb123 0]

Hi all i have had a similar problem.

 

My printer just died. No power to board. 

Power supply okay and 24v to board. 

Ive since inspected board and found the following component seems to have failed in the attached image. 

Does anyone know what this component is as the 1st letter of the part number is burnt. 

 

Someone mentioned a 5v regulator.  Is this it, and if not does anyone know where it is?

 

Thanks

[Alexjwb123 0]

On 2/28/2017 at 8:55 AM, Daid said:

I agree with electromu, it's most likely the 5V power regulator that is blown. Not the easiest part to replace sadly.

On the whole fan confusion. On older machines, there was no official connection for the small print head fan. This fan was added later in the design when the first large batch of boards was already ordered. (Those where chaotic times)

To get the 5V fan to work, we hooked it up to the 4 pin connector that you see now, this 4 pins has serial and power. (Actually designed to be hooked up to an Pi). Later a connector was added for this on the board, but due to variations in connectors this isn't used in this case. Most likely this board was already replaced once? As the connector on the fan cable is bigger then the connector on the board, requiring the old hackjob.

The fan could be power<->ground reversed, but that's fine, almost all fans do not care about this. And thus it's a mistake easily made by assembly.

Also note that there are 3 fan connectors on the board:

* Next to the 4 pins connect, this is 24V, always on.

* Near the limit switches, this is 24V, on/off by the controller, used for print cooling

* At the middle of the board, 5V, can be switched on/off in later revisions of the board. Missing in early versions.

Hi, i wonder if you could tell us where the 5v regulator is on the board? I have a similar issue and have found this component burnt but cant identody it.

Thanks

[electromu 364]

Hi

 

U6 is the 5V regulator.  

If you can change it take advantage to change also D16

[Alexjwb123 0]

Electromu. Thankyou so much!

[dbrgn 11]

Here's another thread with the same issue (U6 burned out):

 

[acca 0]

Hello,

I have an UM2 wich doesn't powers on at all

As proposed here, i have checked 24v on TP77, it's ok

And 5v on TP16 it's KO

I have visually checked U6, it seams ok

I have desoldered one side of D16 and checked it with a multimeter :

When set in ohmmeter : i have 0.3Ohms in both ways

In diode test mode, i have 1mV in both ways

 

Does it means D16 is dead ?

Is it possible to test if it is the only problem before buying D16 ?

Thanks