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Below are instructions to adjust brightness on HP laptop
Press the "Fn" key with the computer turned on and hold the key.
Press the "F7" or "F8" key on some HP laptops, which are
printed with a small sun icon on the key. The sun icon is filled on the
function key for dimming the laptop. The other key is printed with a
hollow sun icon for brightening the screen.
Press the "Fn" and left arrow keys together on some HP
laptops to turn down the brightness. The "Fn" and right arrow key will
increase brightness. Press and release the right arrow key repeatedly,
while holding down "Fn," to decrease the screen brightness slowly, or
hold the keys to darken the screen as low as the setting will go.
For HP Monitors
Press and hold the down arrow key on the front panel of the
monitor below the screen to turn down the brightness on the external
monitor to the lowest setting.
Repeatedly press the down arrow button to dim the monitor gradually.
Press the up arrow key on the monitor to increase brightness.
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.
For Windows Vista / 7 1. Press the Fn+Left Arrow Key for brightness down and Fn+Right Arrow Key for brightness up (the Fn key is located at the left side of the space bar) 2. If that won't work, go to Start > type Power Options and click on the Power options icon.
When you say that your laptop "screen is dim", do you mean that there is no light coming from your screen, but you can see images on it? or do you mean that there is light coming from the screen, just a very little amount?
If you can images, but NO light is coming from the screen, then the LCD backlight is dead, and it needs to be replaced.
If there is light coming from the screen, but it's very dim, then you'll need to find the screen brightness adjustment keys on your laptop. This is usually two keys. The first one is normally in the lower left corner of your laptop and should be a different color - like blue or purple, and will be labeled something like "Fn". The second key is normally in the function key row (F1, F2, F3, etc...) and has a symbol on it that looks like a sun or burst of light with an arrow. There's usually one for "brightness UP" and one for "brightness DOWN". Hold down the Fn key, and then press the "Brightness UP" key a few times to see if the screen brightens up. Good luck.
You should be able to use the "FN" key and "F5" key, press and hold the "Fn" key then while holding that key, press the "F5" key to decrease the brightness. Use the same(Fn) key and "F6" to increase the brightness.
I am assuming this is on your laptop display and not a monitor connected. If this is the case, you most likely pressed FN + the DOWN ARROW. You can use the FN key (usually on the left side near CTRL and/or ALT) in combination with the UP and DOWN arrows to increase/decrease the brightness. This is real handy when you want to have longer battery life as the lower the display brightness is the less power it uses.
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
The computer's power management system automatically dims the screen when using battery power, which is one of the power-saving features.
To adjust the brightness:
Hold down the Fn Key located at bottom left of your keyboard next to the Ctrl key, and adjust the screen brightness using the left/right arrow keys located at the bottom right of the keyboard.
If that's not it then
A dim or dark screen does not necessarily mean a bad inverter! It could be a faulty lcd backlight bulb, inverter cable, inverter, or in some cases a motherboard failure. If your still under warranty then I would get Acer support on the phone and see what they can do.
An Inverter converts direct current (DC) to alternating current (AC).