Bad System Board=poor backlight?

I sent my Compaq Evo N620c in for warranty repair due to a bad backlight. The screen was replaced, but the new screen had major dark spots on it and severe backlight variations. I sent it back again, and the second replacement had horrible lighting variations AND dead pixels. I have now sent it back a third time. HP has replaced the screen again but is reportedly seeing the same issue. They now have diagnosed it as a system board issue and will replace that as well. How would a bad system board cause dim spots on the LCD?

 

The system board contains the GPU(video card) which drives the LCD. If theres a problem with the GPU output, that problem is passed along to the LCD.

 

HP's techs fail for not determining this the FIRST time. Unacceptable IMO.

 

Not necessarily. The unit went in with a reddish backlight. That's clearly a backlight failure. They should have caught it the second time it went in. However, the replacement screen they installed the second time did have dead pixels, which is completely unacceptable. I'm writing this on my company-issue Dell Latitude D630, which has a very evenly lit backlight and no dead pixels (though the color is a bit washed out, I don't care since it belongs to my company). It seems that HP is digging at the bottom of the barrel for a 4:3 SXGA+ LCD panel replacement...considering the relatively obsolete nature of the Evo N620c, I'm probably getting parts that have sat around for a while. I'd imagine HP doesn't really like supporting this thing, but as long as they'll sell me warranty extensions I'll keep buying them for around $130/year.

 

The thing to note hear is if they return it to you and you have another problem either with the board or LCD, you now have a documented record to look into a replacement under Lemon laws. Just make sure that if that comes about, you immediately work solely with a case manager as this will help to hopefully get the best results.

BBGus

 

The unit is four years old. I don't think it would qualify as a lemon.

Back to the topic at hand. The unit came back. New screen? No. Unsurprisingly, it still has dead pixels. They replaced the system and power boards, and during reassembly didn't install the touchpad correctly. Guess what I get to do now? Send it back AGAIN. The touchpad thing is completely inexcusable. It's a simple process and they screwed it up.

I've owned Compaq Armadas and Evos for ten years. Not sure why HP seems to be doing everything they can to make sure my next machine is a Dell.