My screen has gone very dark - what do I need to do to brighten the screen
You don't give any information about your computer, and that makes it hard to give a precise answer. But if you have a laptop, or you're having this trouble with an LCD monitor on a desktop computer, the display backlight may have quit working. Without the backlight you can only very dimly see the display. The usual reason is that the inverter board (in a laptop) or power supply (desktop monitor) isn't working.
Laptop inverter boards are pretty simple to replace, and you can find them for most brands and models now at reasonable cost. Check eBay where there are many sellers. Once you have the replacement, you just need to remove the front bezel of the display, which usually means taking out screws at the corners and releasing snap tabs around the edges. The inverter board mounts below the display panel and there are two cables connected. Unplug the cables, remove the old inverter, put the new one in and reconnect the cables and you're done. The brightness should be back to normal. (It's also possible but less common for the backlight lamp in the LCD panel itself to be bad. While it is possible to replace the lamp it is very difficult to do. It's usually simpler and safer to replace the whole display panel, although they can be expensive.)
In a desktop monitor, bad capacitors in the power supply often cause the backlight to go out. Many sites show what bad capacitors look like and describe how to remove and replace bad ones. It's a more difficult repair than the laptop inverter replacement, involving soldering on the circuit board, but it's still something you might be able to yourself.
Good luck, and thanks for using FIxya!
Aug 06, 2011 |