Small schematic for the FF4 USB daughterboard, revision 1C, marked FINAL and supplied as a PDF in a RAR. FF4 matches a Quanta project code, but the name states no laptop brand or model. Use it to trace USB power, check the current-limit switch, find the connector pinout to the main board and diagnose dead ports or shorts on the 5 V line. Confirm the small board is printed FF4 and R1C before relying on component positions or values, since other revisions may differ.
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 @schematicslaptop. Enginerys does not host this file.
All sources (5)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @schematicslaptop | 10 Nov 2022 | Open file on RM Schematics |
| @schematicslaptop | 10 Nov 2022 | Open file on RM Schematics |
| @cyberlanelectonik | 15 Jul 2026 | Open file on RM Schematics |
| @schematics_bios | 14 Aug 2026 | Open file on RM Schematics |
| @schematics_bios | 14 Aug 2026 | Open file on RM Schematics |
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.