Hello,
i want to know explanation about laptop circuit in detail such how voltages distributed,functions of different units,how to begin the troubleshooting of motherboards,.........etg
Possible.
But if he's about to do some repair work he'll want specific model info.
That type of material isn't generic - it's different between generations and even within the same generation.
We're not here to tell you all of that. Seriously, unless someone here has intimate knowledge of that kind of thing and is willing to type it all out JUST for you (doubtful), Google...