Contraves PC0789‑01 A 4788 is a high‑current industrial control card used in servo drive and axis controller assemblies. Common failure points for this class of boards include burnt or damaged MOSFETs/IGBTs on the power stage, degraded gate drivers, and loose solder joints on the I/O connectors; overheating from inadequate cooling can also trigger thermal shutdowns. Begin troubleshooting by verifying that the supply rails (typically 48 VDC or higher) are within spec, inspecting for visible burn marks or cracked components, and checking all signal traces and connector pins for continuity and proper voltage levels. If faults persist, review any stored error codes from the host controller and perform a step‑by‑step functional test of the power module before proceeding to component replacement.[oss-gpt-20b]