my knowledge is very crude indeed it can be simply done by fbus cable using the many suitable boxes
or soldering thin wires for a serial port
and many a times seemingly hw problems are just cured by reflash
alternatevly he can use a multimeter to check the fault and replace the component or rather remove it and make a jumper insted the charging components that usually get fried can be found from diffrent boards easily and most of them can be removed and a jumper can be placed reheating the charging ic and retru are also an option if one is unable to reball them :] detaching and replacing the usb post also does the trick sometimes as theres no clear way to check if the port got fried
thease are just the basics i do when i fry something