Lcd pixles htc dead

Hi everybody,

I've changed the LCD+touch screen of my HTC desire 516. Once I connected the buses and I turned on the device, all seemed to work. So I re-assembled all the phone but when I turned on it again, a green/black spot appeared in the right corner of the screen. I'm pretty sure to have paid enough attention and to have not damaged any part. I noticed that if I press "strongly" on the screen, the screen becomes all white. I think they're not dead pixels, but I'd like to listen to your opinion. I'll attach the image of the LCD