I have a 2015 A1502 13 inch macbook pro. The on board screen has a back light on, but no image. When I use a external monitor it works well. The laptop does recognize that the internal display is connected. I have tried smc, and pram resets to no avail. I have also tried disconnecting and reconnecting the lcd cable on the logic board and that did not work either. Plz help…
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Take the bottom cover off and look for corrosion damage around the internal display connector.
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No sign of corrosion around the connector, or anywhere on the board.
Thats not good ;-{ The display logic on the logic board is complex! The output from the CPU's graphics engine goes through a few different logic to output to either the external ports and the internal. This will require some deep diagnosis to figure out what component failed.
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