Advice 1: How to turn on the backlight on a laptop

The backlit keyboard exists only in some laptop models. Without a doubt, this is a very convenient option, allowing you to comfortably work even in complete darkness. When there is backlight, you must know how to turn it on.
How to turn on the backlight on a laptop
Instruction
1
Keyboard backlight turns on when you press the Fn key and one of additional keys. What is key to include - depends on the model of laptop.
2
In many cases a shortcut can be defined visually, as added keys (used by a number of F1–F12) manufacturers apply additional characters. The color of these symbols is the same as the inscription on the key Fn. Experiment by pressing together with the Fn keys with additional symbols. Look for the figure with the symbol illuminated keyboard.
3
Note that when you press a key you can use other options – screen off, entering sleep mode, etc. to cancel changes, press the same combination again.
4
If the drawings on the keys does not reveal the right combination, you know that the backlit keyboard on your laptop have, try the following combinations:
- Fn + F6 or Fn + right arrow;
- Fn + SPACE (space);
- Fn + F5.
5
In that case, if your laptop keyboard has no backlight, it is possible to make the external lighting using the +5 V power supply from the USB connector, and one or more white LEDs. In the connector you need two outer contacts (left and right). The supply voltage of white led is equal to 3.5 V. So the resistor that will be extinguished excess of 1.5 V. the led Current of 20mA, or 0.02 A. Then the resistance of the additional resistor will be 1.5 V/0,02 = 75 Ohms.
6
If the brightness of a single led is not enough, connect one in parallel with the same resistor. Always check consumed by the led current, since it differs from 18-20 mA negatively affects the service life of the led. Need current set resistor selection. The USB connector can give up to 0.5 And means that it can be powered up to 25 LEDs.
Useful advice
On some laptops have dedicated key to turn it on, it may be in the upper left corner of the keyboard.

Advice 2 : How to enable backlit keyboard

Owners of a mobile phone or smartphone noticed that the phone light and not only the screen but also the keyboard , in great measure, puts the device. In some situations, it is very inappropriate. Therefore, lighting is often switched off, and then can't find the option.
How to enable backlit keyboard
Instruction
1
Take your mobile phone. Click mobile device and select "Settings. Log in the General settings of the phone. Select "backlight setting" or any other which can be associated with actions to enable or disable the backlight of the phone. So, for example, in the simple phones from the famous Samsung this option is called "adjust the brightness of the display".
2
Open the main menu, if you are the owner of Nokia smartphones on the Symbian platform, and select "control Panel", then go to General settings as a rule, this is the first item, go to "light Sensor" and turn on or turn off the keyboard light or make brighter/dimmer mode its glow, to decrease or increase the brightness of the display. Also select the desired function for flashing the light indicator.
3
To enable or disable the keyboard backlight in Samsung smartphones, perform the following actions. Open the mobile device's configuration settings. Select "Menu", which is responsible for the configuration of the apparatus. Log in to the selected item and enable or disable the backlight of a smartphone.
4
Remember, many manufacturers hide the keyboard settings (turn on/off the backlight) so far that in some cases, still have to read the user manual of the mobile device and to find their own instructions for enabling the functionality of the keyboard backlight and turning it off.
5
Attention! Producing steps to enable the keyboard backlight in a mobile phone or smartphone, memorize the sequence of their actions, then it was no problem to disable the specified function in the same way, by simply placing or removing the appropriate checkbox.
6
Keep in mind that most modern phones have a power saver, which allows pressing of a power button to turn on and the keyboard backlight or turn it off.
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