Where is the contrast adjustment? - Acer Aspire 3680 Laptop

The Robinair 34788 is an automotive air conditioning service machine that features a large, easy-to-read display. If the display on your 34788 machine appears dim or the contrast is not suitable, it is possible to adjust the display contrast to improve visibility. Here are the steps to adjust the contrast on the Robinair 34788:

1. Turn on the machine and wait for the display to fully light up.
2. Press and hold the "Enter" and "Clear" buttons simultaneously for three seconds.
3. The display will show "Contrast" and the current contrast setting.
4. Use the "+" and "-" buttons to adjust the contrast to your desired level.
5. Once you have set the contrast level, press the "Enter" button to save the setting.
6. The display will show "Contrast Saved" to confirm that the new setting has been saved.

If you are still experiencing difficulty with the display after adjusting the contrast, there may be an issue with the machine's internal components or the display itself. In this case, it is recommended that you contact a qualified service technician for assistance.

To help you change the brightness and contrast settings from the LCD monitor, please follow the instructions mentioned below,
The control buttons are located at front panel of the monitor. The Brightness Button is used to select the Brightness/Contrast adjust functions. Press to switch functions or adjust settings.
To decrease the brightness or contrast press (-) button & to increase (+) as per your adjustment.

GuruAid.com

From this web site:
http://www.computerhope.com/issues/ch000594.htm
How do I adjust my brightness or contrast on my laptop? Every laptop is different, so adjusting the brightness or contrast on your laptop may vary from the steps provided on this page. However, understanding the process of how to adjust the brightness or contrast will help you change your settings.
Most laptops adjust their brightness and other settings using the function key in conjunction with another key. For example, pressing and holding the function key (abbreviated as "Fn") and pressing the up or down arrow keys as shown in the picture below, increases and decreases the brightness.

Other examples also shown in the above picture include pressing Fn and F1 and F2 or F7 and F8 to increase and decrease the brightness. If none of the above examples resemble your keyboard look for keys on the keyboard that have pictures of a sun or a half moon to identify the correct key to adjust the brightness.
How can I adjust the laptop contrast? Laptops only allow users to adjust the brightness of their screen. Contrast settings are not adjustable on a laptop display.
How do I save the new adjusted settings? After adjusting your laptops brightness it will retain the new settings.
Laptop brightness is still not enough or screen is black If after following the above steps your brightness is still not enough, plug your laptop into the wall to make sure it is not a power setting that is decreasing the brightness. If the laptop is plugged in but still is not bright enough, try the suggestions on the below link.

• My laptop computer screen is black.

Hi,

Dear User...

You can adjust the brightness and contrast of your monitor to improve the readability of text and to make digital pictures appear more like they'll look when printed.

To improve the results when adjusting the brightness and contrast settings for your display, use Display Color Calibration. (Display Color Calibration helps you adjust these color settings and others.) For more information about calibrating your display color in Windows, see Calibrate your display.

The way you adjust brightness and contrast varies and depends on your specific display.

• Brightness and contrast buttons on the front of the monitor. Some monitors have brightness and contrast controls on the front and use the standard symbols shown in the following image.

• On-screen menu. You can change the brightness and contrast settings for some displays by using an on-screen menu, and then setting the brightness and contrast in the resulting menu. Many times, you can view the on-screen menu by pressing a button-possibly labeled Menu-on the front of the monitor.

Thanks....

Brightness can be adjusted by the hotkeys or within windows (system settings - backlight).
contrast can be adjusted with a potentiometer at the mainboard.
normally contrast does not change over the lifetime (my oldest 3090 is used 8h/day for 7 years)

some of the old 3090 have a CCFL backlight which dramatically losing brightness when getting old. you have to replace the tube or display unit.

Very old set--always adjust so contrast not too high--it should always be lower than brightness---say brightness at 75% and contrast lower--if contrast set too high smearing will occur and picture quality will be affected.

Right click on your main screen. Go to properties, or graphic properties, then you will find there is a contrast adjustment within. Usually under color correction.

Sounds like the contrast on the screen is turned all the way up. To adjust the contrast, press feature *7 and a number between 1-9 to adjust the contrast level.Press the Rls key when finished.

<Fn> +
<→>
Contrast up Increases the screen Contrast


<Fn> +
<←>
Contrast
down
Decreases the screen Contrast.


This will help you achieve this adjustment.

http://support.dell.com/support/edocs/monitors/r83546/EN/setup.htm#Using the OSD
"NOTE: When using DVI source, the contrast adjustment is not available"