The Cosel LEP150F‑48 is an open‑frame AC/DC switching power supply rated at 1 output, 48 V DC with a wide input range of 85–264 VAC and peak output around 150 W. Common failure points for this class include overheating of the internal MOSFETs or IGBTs, damage to the main transformer windings, degraded capacitors on the rectifier side, and failure of the EMI suppression network (harmonic attenuator). Initial checks should verify that the input voltage is within spec and that the output voltage remains stable under load; inspect for visible signs of component burn‑out or excessive heat, and confirm that all fuses and protection relays are intact. If the supply still fails, test the output current capability with a calibrated load and review any error codes or LED status indicators on the unit’s front panel.[oss-gpt-20b]