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compaq presario 18XL2 laptop screen outage
I have a Compaq Presario 18XL2 laptop which seems to work fine for the
first couple of minutes after being turned on, but then the screen goes blank. Once the screen is blank, vertical white lines will randomly flash on the screen every couple of seconds. I'm fairly certain this is a hardware problem, because the laptop boots and runs normally under both Windows ME and Knoppix 3.4 (Linux) operating systems until the screen goes blank. It seems to be an over heating issue of some sort, as the screen blanks sooner if the laptop is already warm. I connected the VGA output to a monitor only to find that the monitor lost the signal and went blank (but with no random white vertical lines) as soon as the LCD went blank. This leads me to believe that the problem does not have to do with the LCD lamp voltage inverter. I haven't yet tried the TV out or the port expander video pins. I completely disassembled the laptop and removed the motherboard. I couldn't find any damage by visual inspection. The graphics chip, an ATI Rage Mobility 128-M ENG, is located on the back of the motherboard. Any suggestions on what could be the problem and, even better, how to fix it? I have a fairly sophisticated electronics lab at my disposal, so desoldering and resoldering isn't a problem (unless it's ball grid array, such as the graphics chip). I looked into getting a new/used motherboard, but I'd rather not spend the money. Besides, it's always fun to muck around with hardware. Thanks, josh |
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