Remove battery remove bottom door
Remove HDD remove wireless module
Remove optical drive
Remove all screws from the bottom case
In the description of this video you can find useful links to various laptop disassembly tools and parts
Remove keyboard
Remove all screws from the upper case
Unplug upper-case cables
And click uppercase out from the bottom case
Pull upper keys up and don't forget to disconnect speakers cable as I Adid
Remove the rest of cables from mainboard
remove crews
pull mainboard up and disconnect power cable
Remove dust from the fan and from heatsink and again from the fan
If you have thermal base you also can clean old one from CPU
In the description of this video you can find useful links to various laptop disassembly tools and parts
And deployed a new layer of new thermal paste
You