macbook display goes dark

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Seen this on other forums as well. Have not yet found an answer.

For last 2-3 weeks, my MacBook 13.3" white display goes dark. Works best when cold -> increasingly frequent when warms up. Able to restore screen by pushing F1 all the way, and then brightening screen with F2. Someone recommended using hot corners to rapidly restore screen.

Based on recommendations I replaced my inverter board and inverter power cable -> no change. Reinstalled Operating System -> no change.

Seems to be a software problem (?firmware)?

Any comments?
 

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