Monitor backlight sometimes won't turn on after idling

hello, own early-2011 15-inch macbook pro. 3 weeks ago sent macbook pro in repair because tab key fell off.

when got machine noticed replaced top case, told, , surprisingly logic board , left speaker. since logic board replaced, had reinstall macbook pro efi firmware update 2.3, thunderbolt firmware update 1.0 , macbook pro smc firmware update 1.5.

machine has started act weird since installation of above updates. if leave machine idle period of time, screen backlight turns off usual while screen remains on, , therefore screen remains barely visible. if move mouse (or move cursor trackpad), backlight won't turn on until keep adjusting backlight brightness 5 seconds. however, sporadic.

else experiencing same issue? appreciated. thank you!

 

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