Flickering LCD Monitor Problem – 2 Ways to Fix a Flickering Monitor Screen

1. Try tightening the cable connections that lead from the PC to your monitor
2. If this doesn't work then the flickering is because the backlight bulb is failing

The backlight is a cold cathode fluorescent tube (CCFL tube) powered by a 12V inverter. Rather than junk the whole monitor when it starts flickering, you can buy a new backlight for $10 or less.

Simply replace the old bulb with a new one from Ebay or other LCD parts stores. This should fix your flickering monitor problem cheaply.

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LCD Monitor Repair – How To Fix Flickering Screen Problems & more

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