Posted by: kandersen | August 17, 2009

Dead LCD Displays. Common Problem.

So this last week I had a couple of LCD monitors at the office go out. Not exactly the same day but within a few days of each other. I ran out and bought a couple more to replace the dead ones.

They were not really fully dead. If you shined a flashlight on them you could just almost see an icon or two where the flashlight was which meant the cold cathode fluorescent tubes were not lighting up. I had seen an article of someone who had taken their dead LCD monitor screen and mounted in front of an old gutted CRT monitor case with a Compact fluorescent bulb in there to provide a replacement light and I decided that might be a good choice to do on this one.

When I opened up the nice little Viewsonics I noticed something interesting, something I had seen before. Lets crank the old wayback machine up for a second so you can get the full aspect of what the problem. It seems that a few years ago was the start of a capacitor plague . This plague effected a lot of electronics a few years ago and from what I am discovering still is a major problem. I used to repair Tv’s VCR’s and such many years ago and rarely was there a problem with capacitors. Yes Electrolytic capacitors can get dry and loose their properties but it used to be a rare occurrence. Now they are dying like flies

Ruptured electrolytic capacitor

Ruptured electrolytic capacitor

So anyway back to the LCD monitor I have, It also had some of these cheap capacitors which had vented. There were actually two 16V 220uf capacitors which had met their doom. Replacement of the bad capacitors made the monitor shine like new. On the second monitor it as well had the exact same problem.

I had a 42″ Big screen ILO LCD which was also dead. I began to wonder if it might be experiencing the same problem. well as it would turn out it also had a 16V 220uF capacitor on the main logic board which had outright exploded. Yes a small detonation inside my big screen caused it to die a premature death at only 1 year of age. It actually took longer to disassemble and re-assemble the LCD’s than to fix the silly little problem.

It may be possible to replace all the cheap capacitors with some nice Panasonic brand but I don’t know if the price/time payoff will outlast the life of the cold cathode tubes in the LCD itself. These monitors do have a maximum lifetime use, but it certainly is longer than one year.

So don’t throw that flat screen away, My bet is its bad capacitors and an easy fix for anyone with just a medial amount of soldering skills.

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