you can’t fix it but you can replace it. Here is the guide for it [guide|59605] and the LCD is available at places like this https://www.amazon.com/Atabletparts-Display-Screen-Tagital-T7X/dp/B01ASJGPCO and the digitizer on here https://www.ebay.com/itm/New-7-inch-Touchscreen-Panel-Digitizer-For-tablet-Tagital-T7X-/131831433038?_trksid=p2385738.m4383.l4275.c10&var=431184513837