UM2+ Regulator on Main Board Burn't.

[AndreCarvalho 1]

Hello, 

So i have a Ultimaker 2+ since 2015 and some weeks ago i started a normal print with 3/4h and after 1h i came to the machine and the machine was tuned off. 

I tried to turn on again, no luck, no signal, no lights, nothing.... Started to dig, and the power adapter was fine, 24v on output everything fine.. 
Started to take off the main board and searching for burned components, and after a while i noticed a little "dot" on the regulator.. 

I thought "the regulator was gone", so, i ordered a bunch of them from farnell, same reference, and replace them, but after turn on the button the regulator is fried instantly. 

Anyone has passed for this? Any thought what can be? Some capacitor? 

I will leave here a video with test with a controlled power and we can see that the regulator start's to heat up wildly and burn's after a while. 
 

https://youtu.be/Iy4ykeSaOLo


(other question if i can't solve this, the china boards from ebay/aliexpress are reliable?, anyone with one? problems encountered? )
 
Thanks,
André.

[Torgeir 146]

Hi @AndreCarvalho,

 

When we change this kind of switch regulator, we'll also change the fly back diode (D16) as well.

When you look at your thermal picture, there is two hot spot.. And the other is this diode.

Also check that the 5VDC out line have no direct ground (other circuits might cause the power supply to fry).

 

Normally it's only this two active components that's fails like this.

 

Ok., good luck.

 

Thanks

Torgeir

[AndreCarvalho 1]

Hello, 

Thank you Torgeir, I will order the (D16) Diode and i will give you some news as soon as i change it. 

Thanks,
André.