Most VFD failures leave visible clues before testing even starts. One of the fastest troubleshooting checks: 👉 Look at the backplate inside the cabinet. If you see black soot or burn marks, it usually means a component has already failed. Experienced techs always start with a visual inspection before grabbing a meter. Follow for real industrial troubleshooting insights. #industrialautomation #vfd #electrician #plc #maintenancetech