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.