Mi macbook mod. A1278 se queda en pantalla negra pero funciona con otro monitor

hola tengo problemas con mi macbook mod. a1278 cuando la actualize a los 4 dias la pantalla se puso negra
pero la compu funciona bien por que la conecto a otro monitor y todo esta bien

Suena a que podría ser el LED backlit, una pieza que es la que "ilumina" la pantalla, pues en realidad la imagen en el LCD no es brillante, es como la de una calculadora, el backlit le da la brillantez. Si fuera así, la pieza no es tan cara.
Si se trata de un problema en la tarjeta lógica o el panel del LCD, ahí si estamos hablando de $$$.
Suerte!

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