The Fagor 800T is a CNC controller monitor that traditionally uses a 9‑inch CRT display mounted on the central control unit. Common failures include screen flicker, image burn‑in, and total display failure due to aging phosphors or internal power supply degradation; the manual notes 220 V AC input with two external fuses and an internal 5 A fuse that can blow under overvoltage conditions. First‑check steps are: verify mains voltage and fuse integrity on both line inputs, inspect the CRT for visible damage or loose connections, and review any diagnostic codes from the controller’s status panel before proceeding to replace the CRT with a compatible LCD upgrade kit.[oss-gpt-20b]