There are a couple things this could mean. It sounds like it was bootlooping . 1) Check the battery connection to the motherboard. Usually bootlooping can be linked to the battery. 2) The screen can be defective. Depending on where you got it, it could be common. I suggest Mobile Defenders for a screen. 3) Something could have happened during the repair that could have caused motherboard damage. This usually happens when screws are put in wrong holes, no anti-static wristband was being worn, or the battery wasnt unplugged during repair. Hope this all helps :) Good luck diagnosing the problem.
You could buy some LCD fluid off of Amazon, carefully lift the digitizer, and using a syringe, add the LCD fluid to the places there is damage. LCD Fluid: https://www.amazon.com/10ml-LOCA-UV-GLUE-Viscosity/dp/B00IOPYLJE/ref=sr_1_1_sspa?...-1-spons&keywords=Loca+glue&psc=1 Hope this helps! PS. I am totally kidding. The screen will need to be replaced. No such thing as LCD fluid <3