Microtouch 11‑1531‑78K is an industrial 15″ CRT touchscreen monitor that combines a standard cathode‑ray tube with a 3M capacitive touch overlay and integrated controller board. Common failure modes include power‑supply or backlight unit faults, degradation of the capacitive sensor grid (leading to ghost touches or no response), and failure of the on‑board display driver IC due to overheating or moisture ingress. First‑check diagnostics: verify that the 12 V/5 V supply rails are within spec, inspect the CRT backlight transformer for burn marks or loose connections, and test touch input with a multimeter across the sensor pads; if those pass, review any diagnostic LEDs or error codes on the controller board.[oss-gpt-20b]