Xynetics Inc. boards are industrial control and amplifier modules commonly used in PLC add‑on, drive, and monitoring systems. Known failure modes include burned‑out power ICs, degraded capacitors on the main supply rail, and cracked solder joints on high‑current traces; these often manifest as intermittent operation or total loss of function after thermal cycling. For a first check, verify that the board receives its rated input voltage (15 VDC for many models) with a calibrated multimeter, inspect the power section for visible damage, and test I/O pins against the reference schematic to confirm signal integrity. If issues persist, proceed with component‑level inspection of decoupling capacitors and the main regulator ICs.[oss-gpt-20b]