Chosen Solution

Hi So yesterday i changed my screen and battery on my huawei p9. I put in the charger, and things looked ok. Green chargelight was lit and screen was working. However when i changed the brightness to max, the screen turned off. When i tapped the unlock button i would only get a glimpse of my locking screen, before the screen returning to black again. At first i thought maybe the new battery is sh*t, so i switched back to the old battery. Just the same thing happened again. What can it be?

Probably a defective screen, nothing much else to it.