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1.8GHz dual-core Intel Core i5 (Turbo Boost up to 2.8GHz) with 3MB shared L3 cache

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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.

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Flickering is quite often related to LVDS cable issues. If logic board was replaced I guess it was for a reason..if that involved liquid damage or image issues it’s likely cable was damaged and needs replacement too.

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Mark Waddington 将永远感激不已
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