Chosen Solution
When it fix it I connect it and it works the screen but the webcam and the back usb don’t work. How con I know what’s the issue. I think the two possible options are the USB cable is broken or the board is broken. Is there anyway I can check it. The back usb I didn’t matter but yes the webcam and I have seen many people convert their Sights into a USB webcam does someone have the pinout of the webcam?
I would review your cable connections to the logic board as you may have mis-connected a few. Review the logic board drawing in this guide: Cinema Display on page 57
