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my laptop is always under thermal throttle and i use cpu heavy applications and it lags due to dipping in core frequencies , i also tried to undervolt it helped a little but can’t work still. so i though to replace my thermal paste but how do i take it apart and change it?

Type “dell inspiron 5570 service manual” in Google and download the pdf. All is explained within.

@soumya download the service manual from here Use this guide How to Apply Thermal Paste to see how to change the thermal paste