Lenovo schematic for LCFC board NM-A421, revision 1.0, with BT460 given as the project code. LCFC, the Lenovo and Compal joint venture, uses the NM- prefix for its notebook mainboards. The 2.72 MB PDF lets a technician follow the DC input and charger, step through VRM outputs and power-good signals, and locate the EC, SPI flash and test points when a board fails to start. The laptop model is not named, so match the NM number and revision printed on the PCB before using values from 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 @hrtechno. Enginerys does not host this file.
All sources (7)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @hrtechno | 23 Jul 2021 | Open file on RM Schematics |
| @alischematics | 13 Sept 2021 | Open file on RM Schematics |
| @pepeelectronica | 28 Apr 2022 | Open file on RM Schematics |
| @Satale_bios_esquemas_Laptop | 12 Jan 2023 | Open file on RM Schematics |
| @ShareMan_Electronic_Files | 28 Apr 2025 | Open file on RM Schematics |
| @schematics_bios | 27 Jul 2026 | Open file on RM Schematics |
| @schematics_bios | 3 Aug 2026 | Open file on RM Schematics |
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.