I've done a tear-down on my trusty G62, which has developed cooling problems over the past couple months. The cooling fan wasn't particularly dusty, but I did clean it out. I've replaced the thermal paste on the CPU and GPU, and done a perfunctory check of the heat pipe to see if it might have sprung a leak at some point.
I'm on the point of reassembling the machine now, but two things stand out to me that I want to get some advice on before I screw it all together. Whereas the CPU's preexisting dab of thermal paste had run free and slopped over the sides of the die, the GPU doesn't appear to have had much at all on it. There was a pad of thermal material adhering to the heat pipe at the putative junction of pipe and GPU die, but it doesn't appear to have ever actually bridged the gap. In other words, the GPU was apparently never in contact with the heat pipe. The bend in the pipe that would have sandwiched the thermal pad between pipe and GPU is too shallow. (Note that I'm positive I didn't introduce any bending or unbending to the pipe when removing it.)
The idea is to eliminate the air gap, but I don't want a layer of goop 1/8" thick on the GPU either. I have some scrap copper I could cut to fit, and use some paste on either side of it to shim the die up to the heat pipe, but I have no idea how well that would work. (I suppose it couldn't work worse than the air gap, which presumably has been all the "cooling" that GPU has had since the laptop rolled off the assembly line.)
Any ideas or advice? Is this a known issue with these laptops? Should I try to locate a replacement heat pipe? I'm living at essentially college-student level economy right now, so that would be an unfortunate expenditure to have to make, especially if the replacement part has the exact same profile as the current one.
Thanks in advance.