[Board failure - U6 chip burned out. Any tips?]

Ah just u6.

I didn't realise diode needed replacing too,

[Board failure - U6 chip burned out. Any tips?]

Hi, I had same issue. Got it repaired and the same component died again.

 

I bought £60 board through aliexpress , fitted, updated firmware and works fine.

[UM2 is dead after short circuit.]

Electromu. Thankyou so much!

[UM2 is dead after short circuit.]

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

[UM2 is dead after short circuit.]

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