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Press and hold the blue 'fn' key and press and release the left/right arrow keys to dim/brighten the screen. It it the arrow keys on most Acer laptops that control this. If it's not the arrow keys, then look for keys with a picture of the sun on them. Press and hold the 'fn' key and then tap the 'sun' keys to adjust brightness. Please let me know if this helps or not.
Then brighten it. You brighten it by Holding Down either FN, CTRL or DEL key + Hit the corresponding key for brightening the display. For example on my computer I press and hold the FN Function key while I hit the UP Arrow key to brighten the screen.
The brighten/darken keys normally have the icon of a circle with sprockets around it like the sun or it looks like a washer that goes between a screw.
I have an Acer lap top and there is an Fn (function key) Icon on the <i and the i> keys that mimic a sun device. If you hold down the Fn key and tap the I> key down over on the right sideof the machine, then those taps should brighten the screen. Holding down the Fn key (left side) and tapping the <i key will dim the screen.
Turn the calculator on. Press and release the 2nd key, then press and hold the down-arrow key to lighten the screen. Press and release the 2nd key, then press and hold the up-arrow key to darken the screen.
You can use the function keys to try brightening the screen, but it doesn't seem like it would help. Hold down the function key (the blue "Fn" key next to the Windows logo key) and press the up arrow in the lower right corner of the keyboard repeatedly. Every time you press the arrow (with the function key held down) it should brighten the screen by one degree.
If the backlight and inverter have both been replaced, the problem is most likely either the screen itself, or a pinched cable somewhere in the connection between the screen and the motherboard or video card. If you know how to take the laptop apart, you can check for pinched cables or harnesses -- if you don't see any, it's most likely the screen.
Backlight or inverter failure sorry to say. No telling which without substitution. Backlights are mostly built into the top of the screen and are tricky to replace. Inverters are generally sited at the bottom of the screen under the facia panel. Look around ebay for replacements