Lenovo laptop schematic for board NM-B291, a number in the LCFC format used by the ODM that designs and builds many Lenovo models. No revision or model name appears in the file name, so read the title block to confirm both. Technicians use the sheets to follow power rails, locate the charger and PWM controllers, check EC and SPI flash wiring and trace a short. Any PDF viewer opens it. Verify the NM-B291 code printed on the motherboard before relying on the values inside.
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 @ITHINKHS. 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.