15" PowerBook G4 GPU Thermal Pad

[Altemose]

I was given a 1.67 GHz PowerBook G4 that runs on the hot side and also has a loose hinge on the right side. I am going to repaste the CPU and in the process also remove the display and tighten the hinge. When taking apart my 1.5 GHz PB I realized the GPU uses a type of thermal compound I have never seen. It looks like a pad's thickness but in the shape of an X. I left it alone and reassembled the Mac without issues with GPU heat.

That being said, this one always ran hotter than the 1.5 no matter what. I know the paste and pad is on its way out. My question is, what do I put on the GPU? For the CPU I am using Arctic Silver Ceramique 2.

 

[eyoungren]

I was given a 1.67 GHz PowerBook G4 that runs on the hot side and also has a loose hinge on the right side. I am going to repaste the CPU and in the process also remove the display and tighten the hinge. When taking apart my 1.5 GHz PB I realized the GPU uses a type of thermal compound I have never seen. It looks like a pad's thickness but in the shape of an X. I left it alone and reassembled the Mac without issues with GPU heat.

That being said, this one always ran hotter than the 1.5 no matter what. I know the paste and pad is on its way out. My question is, what do I put on the GPU? For the CPU I am using Arctic Silver Ceramique 2.

I'm not sure of what type of thing you have going here. But I will just say that when I put my logicboard in recently, I used AS5 on all three chips. Heat hasn't changed much from what I was experiencing with the old board.

Don't expect much of a change here either. The 1.67 puts out a lot of heat.

 

[Altemose]

I'm not sure of what type of thing you have going here. But I will just say that when I put my logicboard in recently, I used AS5 on all three chips. Heat hasn't changed much from what I was experiencing with the old board.

Don't expect much of a change here either. The 1.67 puts out a lot of heat.

I know about the heat but this "material" on the GPU looked really thick to be paste but I have never seen a pad in the X format. I wonder what the Apple Service book would say on this. I don't want to risk burning out my GPU.

 

[sarthak]

I know about the heat but this "material" on the GPU looked really thick to be paste but I have never seen a pad in the X format. I wonder what the Apple Service book would say on this. I don't want to risk burning out my GPU.

Would be helpful if you can share some pics.

I've seen regular "square" thermal pads which end up burnt with a hole in the center over ~5 years. Never seen a cross pattern pad.

 

[Altemose]

Would be helpful if you can share some pics.

I've seen regular "square" thermal pads which end up burnt with a hole in the center over ~5 years. Never seen a cross pattern pad.

When I take the machine apart I will take a picture. I have to remove the whole display assembly so the Logic Board is coming off anyway.