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Hi all, MacBook Air displays no image on internal display but will via display port to external display and works fine. There is no evidence of any liquid or visual bad components front and back of MLB. LVDS Connection is also fine on MLB. I have replaced the internal display but the issue is still present. I would like to repair the MLB via micro-soldering but im not sure what component may be at fault, any guidance is greatly appreciated.

Follow this guide MacBook Air 13" Mid 2012 Display Assembly Replacement Stop at Step 3, then jump to Step 22 carefully disconnecting the cable. Now hold the cable end so you can take a picture like this

Make sure you are as tight as this shot and in focus (you may want to add some light) Then follow this guide to post the pics Adding images to an existing question so we can see things.