I have two dead GPU at hand, is there any tutor on how to fix this GPUS? Someone told me GPUs have fuse on them but I don't even know how their fuse looks like, they aren't like fuse you would find in every other electronic parts, any tutorial link?
Very rarely is it the fuse which causes a GPU not the function. An easy way to check if the fuse is blown is to just use a multimeter and check for continuity. If there is an open circuit then obviously its blown and you need to replace it. However if a fuse was blown, chances are it'll get blown again, so find out why. Maybe faulty wiring somewhere or bad riser which is shorted.
I have a dead GPU, it's a new 1660 super that stop displaying after I insert riser to the wrong side, the riser gots smoked but I expected the card to still works but till date it's not working, is there anything I can do
You blew something on the GPU. Take out the heatsink and inspect it. It should be obvious what was blown. If its one capacitor only then there is a good chance you can fix it. However most likely you blew a few components AND blew a hole in the PCB board rending it useless.