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A bit of multi-meter readings found out that Q25 is faulty as a reason Q22 is not able to current it needs to power on the backlight.
So for now I've shorted R420 as a temporary fix to bypass that.
They both are near 40pin LCD connector on board.
Anyone referring the post check P31 of board schematics here.(https://dropbox.com/s/...)
Thank you so much for your very detailed report!
I was facing the same issue, except for my Dell Inspiron 7559, The schematics are found here: https://tinyurl.com/y8sltxen
Just like you, a mosfet was the problem. For me, it was Q7 for my laptop schematics. Replacing the mosfet fixed the backlight issue - the job took some tricky soldering and a 50 cents part.