Short problem description:
HP G62-b50SR, GPU temperature rises up to 90-100 degrees, computer begins to slow down and even shuts down sometimes. I cleaned my laptop many times, replaced thermal compound and silicone pads. When I have bought it – all was working perfactly. Operating systems – Windows 7 and Windows 8. In normal usage state (surfing in browser) the temparature varies between 65-85 degrees.
Detailed description:
I have bought my HP G62-b50SR laptop 2 years ago. After one year I began to notice GPU overheating (about 90 degrees) and slow fps in games. I was understanding that I need to clean it. I have disassembled it with help of video tutorial. My laptop supports Switchable graphics technology, so there are 3 chips under cooling system on its motherboard: CPU (AMD Turion II Dual-Core P540), integrated graphics card (ATI Mobility Radeon HD 4250) and more powerful graphics card (ATI Mobility Radeon HD 5470). When I took off cooling system there was thermal compound on CPU and thermal pads on GPUs. But at that time I didn't know what is thermal pad, so I have removed them. Then I realized my mistake and using some post on specialized site I used part of bandage + thermal compound to replace thermal pad. I have replaced old thermal compound from CPU with new one and assembled laptop. After that I didn't play games for one or two months, but then I began to play and the same situation repeated – overheating and slow down. I have already tried to use thick thermal compound layer for GPUs. Nothing helped me. I tried to use new thermal pads and again no effect.
So can anybody help me?
Photos:
Taking off cooling system
From left to right: CPU, integrated GPU – 4250, GPU – 5470
Cooling system
Best Answer
Generally the thermal interface material will not degrade that quickly. looking at the pictures, I think I see dust accumulation on the fan blades. If so then you may have accumulated dust on the leading edge of the heat exchanger. Over time dust and fiber can accumulate between the fan and the heat exchanger creating a "beaver dam" effect that blocks air from flowing through the heat sink. In the top picture, under the large red arrow on the right would be where the beaver dam would be if it is there. You may need to disassemble the fan from the heat pipe assembly to see if this has occured and to remove any blockage. Hope this resolves your problem.