I have a Dell G3 3590 with a 1660ti and i5 9300h, i've recently run into some thermal issues. It used to work completely fine two weeks ago and had an avg temperature of 40-45 degrees Celsius running under a simple work load. But now its running at 60-70 C under the same work load. I have reason to believe that it might be because of the dust thats been accumulating inside. I just want to clean the insides for better airflow. Also will the people at dell be willing to help if I to them for this cleaning .
Simply removing screws from a laptop won't void the warranty. In many laptops you can upgrade parts or switch out a hard-drive which is considered self-repair. This doesn't void a warranty. Just don't mess around with the other internal components that are not meant to come out.