Customer question: What should be checked before energizing a newly installed used screen?
English explanation
First confirm that installation is safe and complete. Check cabinet locks, support, lifting removal, protective barriers, cabinet direction, module condition, connector labels and maintenance access. Confirm that power circuits, protective earth, RCD/RCBO and upstream capacity have been reviewed by a qualified electrician. Do not energize a wet, damaged or mechanically unstable installation. Then review the signal chain: source, processor input, processor output, sending port, fiber/RJ45 link, first cabinet, cascade order and screen zone. Confirm that the receiving-card configuration has been backed up and that the correct file is identified. Check that no internal ribbon or power connector is loose, but require full isolation before any internal inspection. Power up one circuit or zone at a time. Observe indicators, start-up behaviour and any protection event. Display a low-risk test pattern first, then grid, arrows, black, white and RGB. Confirm that each independent screen is mapped correctly. Do not begin with a high-brightness full-white run before the power and thermal conditions are known. Record voltage, circuit, time, software/firmware, configuration file, test pattern and result. If anything trips, heats abnormally or behaves intermittently, stop repeated resets and investigate the relevant layer.
Service boundary
First power-on is a coordinated electrical and technical commissioning activity, not a casual plug-in test. —
