After updating the system to Sonoma, the keyboard backlight does not turn on! Preinstallation through recovery did not change the situation. Resetting smc and pram did not help! restore via dfu is also zero! I put the board in another Mac and it turns on the light! I put a board from another Mac into this one and the backlight works too! Only the original board does not turn on the backlight! Can anyone please advise, I beg you!
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