PDF guide on replacing an SG6741 PWM controller with an SG6841 in a Lenovo IP adapter, likely IdeaPad, though the name abbreviates it. Both are Fairchild current-mode PWM controllers for flyback supplies, but their pinouts and surrounding parts may differ. That is presumably why the document details the required modifications. It is useful when the original chip is unavailable. Check the MOSFET, current-sense resistor and start-up components before fitting the substitute, and test the repaired charger with a load.
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 (6)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @schematicslaptop | 18 May 2025 | Open file on RM Schematics |
| @ShareMan_Electronic_Files | 19 May 2025 | Open file on RM Schematics |
| @pkbiosbdv | 15 Sept 2025 | Open file on RM Schematics |
| @cyberlanelectonik | 23 Jul 2026 | Open file on RM Schematics |
| @BoardSchematic | 13 Oct 2026 | Open file on RM Schematics |
| @schematics_bios | 26 Oct 2026 | Open file on RM Schematics |
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