I recently took apart my laptop for the first time and learned a valuable lesson: you should take note of where thermal pads go before you remove them. I'm hoping someone can let me know where to place the pads. If anyone knows what thickness to use that would be great as well. I included three images of the motherboard as I'm not sure which is best; hopefully I embedded them properly.
https://i.imgur.com/ScvcXzG.jpg
Here is a guide from an Acer PH717-71 mobo, where the components are coloured red is where the insulating pads need to be placed, which is on the VRAM chips components as they get hot and need thermal pads, the cpu and gpu need to be covered with paste, for pads and in your case, use the Thermal Paste & pad Replacement K5 PRO liquid pads, as you can compensate well with the liquid type instead of the pad material, for the cpu/gpu use the Therma Grizzly paste as they are the best. Acer does not list Thermal pads on the majority of their laptops but on the example that I've given you the PH717-71 they list the CONDUCTIVE TAPE with Acer part number 47.Q4YN7.003 so you can use that if you want.
I was definitely hoping for something more specific than an image of a random Helios 500 motherboard. There are actually multiple videos/images of the Intel variant from the same year which is more similar to mine than the one you posted but still considerably different.
