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Mid 2012 model, A1278 / 2.5 GHz i5 or 2.9 GHz i7 processor.

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LCD does not turn on after I disassembled the MacBook

I have a problem with the LCD MBP 13 mid 2012 I after I changed the keyboard, LCD suddenly died I was very sorry to have unpacked it, then I tried to use the Converter to External Monitor to make sure the machine was running, and luckily the monitor could display images, and mean Logic  Board is safe, does my LCD macbook really need to be replaced?  Can my LCd still be used for life?  , then I also experienced a problem when my Charger Cable Macbook turned on by itself without pressing the power On, is that normal?  and if it's not normal how do you fix it?  thank you in advance, I hope this problem can be resolved thanks to the help of friends at Ifixit

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Let’s start with last question..if your battery was disconnected from the board when you plug back in magsafe the first time it auto starts, that’s normal on i5/i7 boards. If that repeats again there’s a problem instead. Now the troublesome, good thing is GPU works normally, bad news is that’s impossible to tell without try and error or thorough testing where the fault is coming from, board, cable or screen. You have to either pay someone with parts and tools at hand to do the troubleshooting for you or buy a potentially useless screen assembly and see if it works.

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