The OHD1202‑24 31491A‑R0 is an industrial control board used in Overhead Door Corp. garage door openers and similar motorized gate systems; it functions as the main logic controller for sensor input, motor drive sequencing, and safety interlocks. Common failure points on this class of boards include burnt or tripped MOSFETs in the motor‑drive section, degraded capacitor stacks on the power supply rails, and cracked solder joints around the microcontroller and I/O headers due to vibration. First‑check diagnostics: verify 24 V DC input stability with a multimeter, inspect all surface‑mount components for visual signs of damage or overheating, and read any stored fault codes via the OHD diagnostic port if available.[oss-gpt-20b]