Diagnose Bad Board

[dfrez 21]

Hi all, 

 

Recently purchased a used UM2+ after using one at work for a couple years. It worked well for a few months after catching up on some maintenance. It came with a few extra parts including a partial Mark2 upgrade kit. 

 

After getting the rest of the parts, I went ahead and installed the new firmware. I installed the board and printed a few things with a single extruder. Then I removed the board again to finish running wires. Once I put everything back, the steppers no longer operate and am unable to connect to the board through Cura, computer also doesn’t recognize it when plugging in. It also throws a limit switch error since the printhead or bed doesn’t move. 

 

Long story short, the board is toast. I’m not sure what I did, maybe I zapped it when I was working with it the last time. But want I help with is determine exactly what’s wrong with it and maybe even being able to fix it instead of just using it as a paperweight. The heaters for the bed and hot end still work. The front display and knob still work. I don’t see any obvious marks on the board that would indicate something burnt out, etc. I do have a spare Chinese board that needs stepper drivers (they are on order) so hopefully I’ll be up and running again soon. 

 

I don’t have a lot of experience with board level diagnosis and mediocre electronics knowledge but it just annoys me to have something fail and not know the root cause of the failure. 

Edited September 6, 2019 by dfrez

[tinkergnome 927]

36 minutes ago, dfrez said:

Once I put everything back, the steppers no longer operate and am unable to connect to the board through Cura, computer also doesn’t recognize it when plugging in. It also throws a limit switch error since the printhead or bed doesn’t move.

 

Always first things to check: Take sure that both "Safety"-jumpers are still in place and the 24V source is still there (can be measured at the marked connector).
Schematics are on GitHub: https://github.com/Ultimaker/Ultimaker2/tree/master/1091_Main_board_v2.1.1_(x1)

 

 

 

[dfrez 21]

1 minute ago, tinkergnome said:

 

Always first things to check: Take sure that both "Safety"-jumpers are still in place and the 24V source is still there (can be measured at the marked connector).
Schematics are on GitHub: https://github.com/Ultimaker/Ultimaker2/tree/master/1091_Main_board_v2.1.1_(x1)

 

 

 

 

Yep, both safety jumpers are in place. I'll check the 24V connector. In order to check, do all the components need to be connected to the board, or can I just plug in the PSU? 

[gr5 2,172]

dfrez told me more details through DM.  Note that it boots up and displays proper menus but no servos move and when he connects it to a computer through a USB cable, the windows computer doesn't recognize that anything is connected: no musical tones even though other devices do make the musical tones when connecting to USB.

 

That alone tells me at least part of the board is dead because USB should work.

 

Another test is to power down the UM2 and connect only through the USB to see if that powers up some lights.

 

Because this is the summer, I doubt the damage would be from static electricity.  More likely some kind of short that damaged several circuits inside the arduino.

 

 

[dfrez 21]

7 minutes ago, gr5 said:

dfrez told me more details through DM.  Note that it boots up and displays proper menus but no servos move and when he connects it to a computer through a USB cable, the windows computer doesn't recognize that anything is connected: no musical tones even though other devices do make the musical tones when connecting to USB.

 

That alone tells me at least part of the board is dead because USB should work.

 

Another test is to power down the UM2 and connect only through the USB to see if that powers up some lights.

 

Because this is the summer, I doubt the damage would be from static electricity.  More likely some kind of short that damaged several circuits inside the arduino.

 

 

 

Yep, thank you for all the help, btw. I figured I'd start a thread to possibly help other members in the future. 

 

Which lights are we looking for when connected via USB? The LEDs on the board itself or the lights on the UM2? 

 

Maybe something shorted when I was handling it. It seems like the board still has some residual power stored even when off and unplugged from PSU for some time. I would imagine due to capacitors etc on the board. 

[dfrez 21]

21 hours ago, tinkergnome said:

 

Always first things to check: Take sure that both "Safety"-jumpers are still in place and the 24V source is still there (can be measured at the marked connector).
Schematics are on GitHub: https://github.com/Ultimaker/Ultimaker2/tree/master/1091_Main_board_v2.1.1_(x1)

 

 

 

 

There is 24V at the headers with the board turned on. 

[dfrez 21]

On 9/6/2019 at 4:45 PM, gr5 said:

dfrez told me more details through DM.  Note that it boots up and displays proper menus but no servos move and when he connects it to a computer through a USB cable, the windows computer doesn't recognize that anything is connected: no musical tones even though other devices do make the musical tones when connecting to USB.

 

That alone tells me at least part of the board is dead because USB should work.

 

Another test is to power down the UM2 and connect only through the USB to see if that powers up some lights.

 

Because this is the summer, I doubt the damage would be from static electricity.  More likely some kind of short that damaged several circuits inside the arduino.

 

 

 

No lights come on when powered off and connected to USB (Rx and Tx). Only the “ON” light when switched on. 

[dfrez 21]

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