Your extruder's gone quiet and the motor won't step. Before you replace the whole extruder assembly, check the adapter board. This is the specific board that sits between your mainboard and extruder motor on Neptune 4 Plus and Neptune 4 Max (TL4974/TL4976). Ribbon cable versions only – if yours has a Type-C connector, this won't fit. Small part, big fix
| 0 | Creality Neptune 4 Plus |
| 1 | Creality Neptune 4 Max |
| 0 | TL4974 |
| 1 | TL4976 |
| brand | JAYCAR |
| wiring_type | Ribbon cable |
| compatibility_note | Not compatible with Type-C version |
| category | ELECTRONICS & COMPONENTS |
| subcategory | TOOLS & SOLDERING |
