A stopped belt, blank display or error code does not by itself identify a failed controller. Supply, wiring, sensors and mechanical resistance can produce overlapping symptoms. Identify the cause before choosing a board.
Record the equipment and fault
Keep the full model and serial number together. Write down the complete error code and when it occurs, then follow the troubleshooting sequence for that exact equipment. A code from a different machine is not a diagnosis.
Identify the actual assembly
A motor controller, power-supply component, display board and complete console have different jobs. Use the service documentation to name the assembly. Do not treat similar pictures or a shared number fragment as proof that two assemblies are interchangeable.
Compare references and revisions
Keep the complete board reference, revision, connectors and any manufacturer-stated programming or setup requirements. Also check model revisions and serial-number limits. Missing setup information must be resolved before choosing a replacement.
Leave electrical diagnosis to a qualified technician
Boards may retain hazardous charge after equipment is disconnected. Do not probe live circuits or assume unplugged equipment is safe to handle. The purpose of collecting labels and fault details is to support the documented diagnostic process, not to replace it.