Hi Irish,
thanks a lot for the quick answer.
The truth is this MacBook belongs to my little syster and for 6 months she's been suffering this issue. She used to press the left part of the screen to solve the issue but it was not always successful. When i disassembled the MacBook i noticed the part she used to press is where the LCD wire resides.
Right now, the LCD display does exactly what appears in the video i posted and then the screen goes all white but i can use the MacBook through the external monitor.
Answering to your question, right now i'm carefully using the MacBook disassembled so the LCD (i think it is also called LVDS ) wire can be seend and touchede. I've tried moving it and touching it in many ways without luck. I mean, event i spent a lot of time moving it, trying to make pressure like connecting it to the LCD display, nothing changes it always keeps the white screen after booting up. To me it looks like the LCD display is not working properly but i'm not 100% sure as my syster has been telling me for the last 6 months that she used to work around the issue by pressing the left side of the screen but this "trick" stopped working some time ago. Short story, right now, no, moving the cable and the LCD display does nothing. I've also tried booting into Diagnosis mode by pressing D while booting but external monitor stopped working and I wasn't able to see anything on the MacBook LCD Display.
I know it's hard to determine, but i was wondering if there is any trick or test i can run to determine if the wire is working properly. I'm planning to attach this LCD Display to a MacBook Air and see what happens but i do not have the Torx screwdriver needed and honestly, i would like to avoid that if possible. Also i though that maybe i could use an electrical tester to check the wires but i would need some clear indications on how to do it. I used to work with electrical testers while studying Computer Engineering at the university but i don't remember hardly anything about them :P
Thanks a lot for your time :)
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