The Old Compressor Could Start, but the Replacement Could Not
That comparison shifted the question from “is the board bad?” to “is this compressor electrically compatible with the refrigerator's R600 inverter system?”
Why a new compressor is not proof of compatibility
A compressor may be described as universal within a product family while still being wrong for the refrigerant application, inverter and winding arrangement in front of the technician. In this discussion, the replacement was identified as an R134a application while the refrigerator used R600.
A similar symptom can have a different cause on another refrigerator. A locked rotor, incorrect programming, damaged inverter, harness fault or incompatible compressor can all produce a no-start complaint.
What the wiring comparison revealed
The installed system used three conductors at the compressor. Contributors contrasted that arrangement with the supplied compressor and explained that the inverter expected a different motor architecture. The old compressor starting on the same refrigerator made a blanket “board cannot start anything” explanation less coherent.
The correct verification happens before installation
Refrigerant application
R600 and R134a labeling cannot be treated as interchangeable.
Drive architecture
The inverter and compressor motor must be designed to work together.
Part documentation
The refrigerator model, compressor part number, service bulletin and programming requirements must agree.
No completed replacement was reported
The source converged on the compatibility mismatch but did not report installation of the correct compressor or a successful final run. This page preserves the failed-replacement evidence without claiming a completed repair.