Remove all old adhesive and glass shards. Isopropyl alcohol helps.
Find the currently available for the Vivo V20. lcd repair v20
LG V20 LCD Replacement Guide – What You Need to Know Before You Start Remove all old adhesive and glass shards
Before ordering parts, identify if you need a full replacement: insert the battery
Connect both ribbon cables to the motherboard, insert the battery, and power on. Test touch, colors, and the second screen. If it works, proceed.