Alright, so I've had the Official Raspberry Pi 7 inch touch screen for at least two years now, and I don't use it very often, but I think the backlight is broken. I can see a very faint image and the touchscreen part of the display still works. I tried using the command
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sudo sh -c 'echo "255" > /sys/class/backlight/rpi_backlight/brightness'
to make sure the brightness was all the way up, but it doesn't change it. So is there any way to fix this or will I need to buy a new screen if I want to use it? I am using raspbian on my Pi.