I have not done this, but I have repasted multiple devices around the house, I could not find a teardown guide for your laptop but here or some good noted for Liquid Metal repastes that I have found on the internet:
- You need a few tools and supplies, including liquid metal thermal compound, isopropyl alcohol, thermal pads, thermal paste removal tool
- Clean, and empty your workspace to avoid debris and dust getting in your system
- Remove the old thermal paste
- I saw something about applying thermal pads but I have no clue why you need to do that
- To apply, squeeze a small amount of liquid metal onto the center of the CPU. Use a toothpick or a clean and lint-free cloth to spread the liquid metal in a thin and even layer and check that the liquid metal covers the entire surface of the CPU
- I would give the inside of your device a dusting with canned air
- Close the laptops case together, do what you want but I would test if it turned on and then screw it all together
- Test the thermal output
If your still getting the same heat output, you heatsink, or fans might be bad. Hope this helps also sorry if I made any grammatical mistakes, and good luck with your repair!