LCD Monitor Inverter Board | Input-Output Voltage for the CCFL Backlight Bulb

CCFL stands for Cold Cathode Fluorescent Lamp. Its function is to light up the LCD monitor screen when a high-frequency current is passed through it.

The power circuits of this lamp are present in the monitor's inverter board, also called the SMPS board. It is called the inverter because it converts low-voltage DC input to high-voltage AC output.

To light up the backlight, you need a 12V DC input. The SMPS board then converts it to a high-voltage AC output in the range of 800-1000 volts. This in turn powers the backlight bulb.

Source Website

SMPS Electronics - A to Z Inverter Board Circuits

CCFL Backlight Tube Used in a Laptop LCD Screen

Like most light-emitting electronic gadgets, LCD laptop screens too are powered by a thin fluorescent tube called the Backlight.

In most cases, it’s a CCFL tube (cold cathode fluorescent lamp) that emits a bright white light under a high frequency input. This in turn lights up your laptop screen from behind.

Within the laptop case, the CCFL tube is paired with an inverter to complete the backlight effect.

Reference Website

LCD Monitor Repair – Updated Tools, Techniques & Electronic Manuals