Lenovo 3000 G230 schematic for the DDR3 memory version, a 1.58 MB PDF; the name adds an unexplained imp tag and gives no board number or revision. Check the title block inside the pages and compare it with the marking on the motherboard, since a DDR2 version of the board would differ in the memory section. With a confirmed match, the pages help trace power rails, look up component values and locate the source of a short or a missing voltage during repair.
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 @smschematics. 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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)