Hi @jcamara ,
Here is a link to the service manual for your laptop.
Scroll to p.45 to view the necessary pre-requisite steps and then the procedure on how to remove the systemboard.
On p.69 there are the part numbers (item #4) for all the motherboards available for your laptop (make sure you look at the correct column if it is for the Yoga 710 -15ISK - 15ISK has 15" screen, 14ISK has a 14" screen).
Perhaps you could check if there is a part number printed on the motherboard itself and see if it matches any of the numbers listed in the service manual.
If you do find a match, search online using the part number only to find suppliers of the part.
Hopefully this is of some help.
crwdns2934105:0crwdne2934105:0
crwdns2934113:0crwdne2934113:0
crwdns2915270:0crwdne2915270:0
crwdns2889612:0crwdne2889612:0
2