Took apart heatsink aspire 7 a715 76g thermal pads melted into dust, what to replace & how to fix?

Clean all that cpu and gpu paste off and vram and chipset blue and white pad paste off and replace all that with a high quality thermal Grizzly paste pad products like below:

Use the Thermal Grizzly Conductonaut Extreme liquid metal for the CPU, for the GPU use Kryonaut extreme and for the VRAM chips use the TG Putty as this product is of a very high quality and all gamers use Thermal Grizzly for efficient thermal pastes on their computers. Good luck and hope this helps you out further.

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Use the TG Putty above as its as this is new product from Thermal Grizzly and its as good as pads and you can accommodate the thickness of the putty exactly to touch the thermal module for efficient cooling of the VRAM chips and Chipset where the thermal module sits on your laptop.

TG Putty

Thermal Grizzly Putty is an electrically non-conductive alternative to traditional thermal pads, specifically designed for GPU modifications and the replacement of thermal pads between the PCB and the cooler.

If this answers your question and solved your query please "Click on Yes" or "Click on Like" if you find my answer useful👍