Quanta HK1 motherboard schematic linked to the Sony board number MBX-247, in a PDF of about 1.02 MB. Sony VAIO laptops use MBX numbers for mainboards, while Quanta acted as the board maker here, with HK1 as its project code. No revision or chipset is stated in the name. The drawing helps trace power rails, check the startup sequence and locate components when repairing a dead or non-booting VAIO board. Confirm both the MBX number and Quanta marking on the PCB before relying on it.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @abgm_manutencao_esquemas. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.