Please check short circuit on deidcated gpu first, there should be 0.7 -1 volt instead 7.5 Volt. There must be problem with mosfet from gpu too, OR check all line 16Volt. I have similar problem with graphics card but haven't schematic. but laptop running normally on integrated card. First you must eliminate short circuit on main 16 volt circuit, then laptop should run on integrated, Thanks. Eventually if deidcated GPU is short then you have to remove all mosfet, cut off. rtx4060 have about 1.2 ohms normally(so it depend on your model gpu) if ohms is 0-0.5 ohms then it must be short. overall only...