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.
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?
Taking off cooling system
From left to right: CPU, integrated GPU - 4250, GPU - 5470