Hi, I was facing the same problem after replacing the screen. While a broken backlight is of course a possible explanation, in my case it was something else.
I can not clarify completely what the problem was but after several tries of rebooting with SMC PRAM/NRAM reset, the issue vanished after opening and closing the screen a few times. Sorry for not beeing able to give clear instructions what to do. I just wanted to let you know that it is worth trying a few things before giving up. Could it be related to the Hall-sensor that recognizes whether the screen is open or closed?
Media vez obtengan, podras ver un gráfico de la reputación que han obtenido con el tiempo.
Aquí está una vista previa de cómo lucirá el gráfico:
Aún no has no adquirido reputación.