3 
2 Screen only works well with external display.
Screen goes dim without a connection to an external monitor. Works fine with an external monitor. By itself it sometimes works but will flicker every once in a while. Or it will just remain very dim. F2 key is unresponsive during these fits. Screen returns once external display is plugged in.
I have a new logic board and new battery installed. The display problem existed before this repair.
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Try to check the connection to the display may be they are rusty connectivity between the connection.
Amily Grey さんによる