The Lambda JFS050024 is an enclosed AC‑DC switching power supply rated 115–230 VAC input, 20–29 VDC output at up to 20.8 A (≈660 W). Common failure modes for this model include transformer winding insulation breakdown, capacitor electrolyte leakage or degradation, and failure of the internal MOSFETs due to overheating or over‑current conditions. For a fault diagnosis, first verify that the unit receives correct line voltage and that the output voltage is within spec; then inspect the input/output fuses, electrolytic capacitors, and heat sink for signs of damage or excessive temperature rise; finally check the control board for any visible component failures or burn marks before proceeding with deeper diagnostics.[oss-gpt-20b]