>>968707
No.
You will find comparators. There are many ways to construct comparators, but most systems use NAND topography as it is faster and more efficient. After a signal goes through an amplifier, it is put up against an array of biased nand gates. The higher the voltage, the more gates switch off. By sampling this array thousands of times per second, you get a raw binary representation of your signal.
Of course, there are many other strategies that can be used to similar effect... But all of these technologies are integrated these days. Even if a bridge rectifier was part of the deal, it is four components within a mass integrated device of hundreds or thousands of transistors.
Anything compromised in your motherboard is such a device. It is not a single component that is on your motherboard, but a series of systems lithed into the dies of a north/south bridge. It is not possible to remove without the capacity to make your own lithed dies. That requires clean rooms... And a pin-for-pin compatible setup with acceptable performance will require Fab tech not currently accessible to the home user.