HP DV9000 no video, part 2.
A while ago I started this thread about an HP DV9000 laptop that had no
video. https://tinyurl.com/ndtmko6 The follow up to that story is I sent the board out for repair. Nearly two months later, I got it back. I reinstalled it and it worked fine....for two days. Then the video went dark again. I decided the best thing to do was to order a brand new board and not have to deal with intermittent, old, connections causing me grief. Now the situation is, as is with many of these HP boards, how do I keep the processors cool to prevent a reoccurrence of the problem? Here are some pictures: http://webpages.charter.net/mrfixite...orthbridge.jpg http://webpages.charter.net/mrfixite...0/GPU-shim.jpg Let's begin with the biggest concern. In the first photo, there is an extra piece of copper that extends downward toward the motherboard. It's labeled, "Northbridge 1.5mm gap." That is approximately how much space there is between the copper and the Northbridge chip when the heat sinks are installed. On the old motherboard, that gap was filled with a spongy thermal pad. The consensus is that if there were an uninterrupted piece of copper between the heat sink and the chip, the cooling would be much more efficient. By the way, what is that stuff that can be peeled off? Would that just be regular electrical tape? Here is a good video showing the orientation of the components. https://www.youtube.com/watch?v=t9w-khwIj3U I'm not sure I would stick a penny under the heatsink to fill in the gap but that's what this particular user did. The other thing I don't understand from the video is why are shims inserted under the CPU and GPU if they already come in contact with the heat sink? In the second photo I linked, you can see the heat sink for the GPU. There is black tape attached to the heat sink. Does that help dissipate the heat? Is that there for electrical insulation? Finally, the motherboard came shipped with a "bonus" copper shim. It's too thin to help with the gap in the Northbridge chip. Referring back to the video, the user put one shim under the CPU, and another one under the GPU. I decided to put the one shim I received under the GPU since that seemed to be the cause of the failure. What makes more sense to me is to fill in the Northbridge gap with copper shims (is it ok to stack them if I can't measure the exact thickness before I buy them?) and leave the CPU and GPU as is. What do you think about this? Thanks for your replies. -- David Farber Los Osos, CA |
All times are GMT +1. The time now is 04:38 AM. |
Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004 - 2014 DIYbanter