I have a crack on my screen that starts in the bottom left and spreads to almost the top right. It is not bad and everything works fine except for the touchscreen. Only half the touchscreen works and sometimes the crack causes the other half of the touchscreen to act on its own and its very annoying and messes me up when I try to surf the web or use Microsoft Office.

Is there a way I can disable the touchscreen?

To disable the touchscreen on the Yoga 13, do the following:

1. Open Device Manager by pressing the Windows key + X.
2. Look for the option Human Interface Device. 
3. Under Human Interface Device, look for HID-compliant device
4. Right click on this option and choose Disable.

Note: Do the same to re-activate this function.