Ive been on a mystery hunt for a good 3 months now trying to figure out how to fix this customer of mines MacBook air 11in. Model # mc505lla. The issue from the start was that the lcd was cracked so they wanted it replaced. I ordered a new lcd in and I put in. Heres where it gets tricky though. Before I changed out the lcd the computers display was just showing a white screen. now for anyone who knows these specific computers would know that the light in the backround is actual lights behind the lcd. Once I changed the lcd though the backlight had stopped working. The lcd was working fine now at this point if you would look very close. After messing with it a good amount I sent the lcd back and started back at the beginning. im lost at this point and this computer has been sitting on the bench for a good amount of time so any help will be very much appreciated
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