Dry Joints in LCD Monitor Circuit Boards

When faced with bad display problems in LCD monitors, the usual suspect is the backlight (the CCFL tube that lights up the screen).

However, in some cases, it is also possible that the problem may be bad solder joints in the monitor's circuit board.

I have seen it happen in some of the brand-name 17" and 19" LCD monitors that were 3-5 years old. On testing, I found that the backlight was working fine. But when I probed a little, I found that dry joints were causing the display problem.