HP Pavilion DV series are known for their issues with the cooling system, resulting in melting the video chip’s solder and moving the video chip over if the laptop is set at an angle (like with an oversized 9 or 12 cell battery). The fix we found came from the XBox 360 fix of the red flashing light, also caused by a problem with video. You would normally want to use a re-flow station specifically made for this purpose, however, if you are like me, just bake the thing at around 400 degrees for 10mins on a flat surface, which will melt the solder and allow the suction under the video chip to pull itself back into place. So there you go – baking he motherboard fixed the issue!
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Baking the Motherboard-HP Pavilion DV2500 Nvidia Video Chip Fix – No Video / Corrupted Video Issue