The motherboard (PCB part number 48.4MS01.011 ) is a critical component for several Sony VAIO VPCEL series laptops, specifically the Sony VAIO VPCEL2S1R
Offers EPROM data and service manual info for the VPCEL2S1R MBX-252 mbx252 schematic full
While full schematics are often proprietary, they are frequently available on technician-focused repositories and community forums: The motherboard (PCB part number 48