We have an older CB2(?) from 2014. It worked fine until we recycled the power. Then the touch screen stopped working without any error messages.
However with a connected usb mouse we can operate the robot.
Is any function to calibrate or troubleshoot the touch screen?
It’s the BIOS battery that has died and reset the BIOS settings (where the touch screen output is set up). 
So either a new motherboard (2.1 upgrade) or replace battery and set up the BIOS again.
Ok, thanks’ for your answer!
Help, my teach pendant isn’t responding to touch!
Hello everyone. I’m having a problem with the touchscreen on my Cobot UR5/CB3 teach pendant. It’s not responding to touch.
However, if I connect a mouse to it, it works perfectly.
I hope someone can help me solve this problem.
Hello @yamil_rod
the obvious questions would be to double check, if it is properly connected to the control box. Also could it have been damaged?
To get the quickest support my recommendation would be reaching out to the correspondent support colleagues via myUR.
/Stefan
Replace the CMOS battery (make sure the polarity is correct on the new one).
Then you have to enter BIOS to set up the correct serial output. I don’t remember the correct settings, but it shouldn’t be too difficult.
Or buy a new motherboard for CB3.1. Then it should work again.
And if you’re not up for any of these things yourself, then take a hold of your local distributor or make a ticket on MyUR, as sko advises.
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