The Ampro D7BN12‑30 is a legacy single‑board computer (SBC) based on the Intel 80286 processor running at 12 MHz, typically used in industrial control or data acquisition systems. Common failure points for this class of boards include power supply decoupling capacitors, the 286 CPU socket and associated voltage regulators, and the onboard ROM/BIOS chip; overheating or corrosion can also affect the board’s I/O connectors. First‑check diagnostics should verify that the input voltage is within spec (±5 % of nominal), inspect the board for burnt components or cracked solder joints, and confirm that all ICs are seated correctly by inspecting the socket contacts and checking for any visible damage to the CPU package. If the board still fails to POST, examine the BIOS ROM for signs of failure and test the power rails with a multimeter before proceeding to component replacement.[oss-gpt-20b]