ProtoTRAK MX2 15814R is a compact three‑axis CNC controller from Southwestern Industries that integrates a DRO and an optional LCD display for machine control. Common failures on this model include power‑supply tripping or brown‑outs due to degraded PSU capacitors, intermittent communication with the drive board caused by loose or corroded I/O connectors, and display flicker or “no signal” errors when the backlight driver or LCD controller IC fails. For a first‑check diagnosis, verify that the 24 V DC supply is within spec and stable under load; inspect all power and signal cables for continuity, corrosion, and secure connections; then review any stored error codes on the controller’s diagnostic screen or via its serial interface to pinpoint fault locations.[oss-gpt-20b]