Schematic PDF for the Sony board numbered 1-689-603-11, 572 KB, with UC3854BN noted in the name. The UC3854 is a well-known active power-factor correction controller, so this is likely a power supply board. Use the diagram to follow the PFC stage and downstream rails, check MOSFETs, diodes and electrolytic capacitors, and find fuses and test points. The trailing digits mark the revision, so match the full number on your PCB before relying on part values.
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 @datasheets1. Enginerys does not host this file.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)