LCD Backlight & Inverter – Connection Between the Backlight Tube & Power Board Inverter

• Backlight is a small cold cathode fluorescent lamp (CCFL) that's roughly 1/10th the size of a regular tubelight. It lights up the LCD screen from behind and can be found in everything from cell phones to monitors, laptops and digital watches.

• Inverter is the electronic power board that supplies electricity to the backlight. It has its own set of circuits & components that are part of the SMPS board.

Some of the most common problems that affect a LCD monitor can be pin-pointed to the backlight, inverter or capacitor. When your LCD monitor goes dark, the reason is usually a backlight bulb which needs to be replaced.

Understanding how electronic components function helps in locating the exact problem faster and with more accuracy.

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LCD Monitor Repair – Understand Electronic Components & Repair Techniques

CCFL Backlight - The Weak Electronic Link in the Performance of a LCD Monitor

Though LCD backlight is expected to last 4-7 years without problems, some tubes start dimming as early as 1-2 years.

A number of factors contribute to backlight failure:

• voltage fluctuation & brownout
• cheap parts / fake parts / used parts 
• humidity & heat 
• (in rare cases) a quality or manufacturing defect

Since the CCFL backlight lights up the screen, losing it will cause the screen to dim, and hence, it is a weak electronic link in the overall usability of a LCD monitor.

Here are some facts about the LCD backlight bulb:

• A backlight is a thin fluorescent tube that lights up the LCD screen
• Most backlights are either EL (electroluminescent) or CCFL (cold cathode fluorescent lamp)
• A new backlight tube has a life span from 5,000-15,000 hours of usage before it loses 50% of its brightness.

Source Website

LCD Monitor Repair – How To Fix the CCFL Backlight & more