Hi there. I'm using ROG G511JM laptop for about 2 years. Several months ago it was raining so bad late at night here while I was asleep. The roof got some leakage and it went straight onto my laptop's keyboard. It was my mistake for leaving it opened like that.
After that I found several keys on my keyboard not working anymore; Tab, F1 & F4. It was okay because it didn't effect me so much, until last week I accidentally turned the back light down (Fn + F3) and couldn't turn it up back 😞
I tried with everything, Hcontrol.exe, external keyboard, on-screen keyboard, but still it didn't work. I have to use USB light to lighten up my keyboard, how sad is that.