Hi @skn344
There is a little chance to repair it by yourself, but you can try to:
First, if the PC is under warranty, skip options to Software solution:
'''Hardware solution:'''
# Make sure, that wires from Touchpad are corectly plugged in
# Also, make sure, that wires are not defective
# Make sure, that your motherboard is visually OK, especially around touchpad socket point
# Then proceed to software solution
'''Software solution:'''
# Update mouse/touchpad driver using [https://support.lenovo.com/us/cs/|Lenovo latest drivers]
# Do factory reset
If the problem still continue, you can do BIOS update, but on the 90%, your touchpad is defective, you can send your laptop to [https://support.lenovo.com/us/cs/solutions/ht104448|Lenovo Repair Center, or contact some authorized service], or you can [https://www.pcexpertservices.com/product/lenovo-yoga-710-14ikb-touchpad-and-cable-8s73042414zz/|replace your touchpad for a new one].
Regards