Coinciding with the emergence of a new line on the monitor of my HP DV8000, I want to present a possible cause for the problem of the stripes. According to a
Italian blog entry stripes on the HP, it seems that the problem is a memory chip BGA package due to its proximity to a heat source, some of his contacts, salaries and cause streaks .
The BGA or Ball Grid Array means that the chip instead of having pins that are soldered on printed circuit board has contact points with a ball of tin located on the surface of the device as you can see in the picture below.
To solder the chip on the motherboard chip sets on the board and applies hot air, which makes the balls are based chip tin and is soldered to the printed circuit contact. These pins are hidden under the chip and are inaccessible to repair. To repair a false contact in this type of package is to remove the chip, clean all contacts and printed circuit chip and has set back the balls of tin in the chip for welding.
The following video I found on youtube can be seen as removing a chip of these with hot air.
And the next machine you can see a ball of tin recreating the chip.
Anyway, assuming the cause of the stripes is the memory chip, does not explain why the lines do not appear when you connect an external monitor to the VGA or why some users are saying that the repair by HP consisted in replacing the LCD panel.