DVE DSO‑142L is a compact 12 V/15 A switching power supply used in CCTV camera systems and KVM switches, featuring an internal SMPS topology with a single AC input (100–240 VAC) and dual output rails (+5 V/2.4 A, –5 V/0.5 A for some revisions). Common failure modes include electrolytic capacitor degradation on the +5 V filtering stage, SMD ceramic filter breakdown, and overheating of the output rectifier diodes or switching MOSFETs due to over‑current or poor ventilation. First‑check diagnostics should verify the AC input voltage and current draw, visually inspect capacitors for bulging or leakage, and measure the output rails with a multimeter while monitoring temperature; if abnormal voltages or excessive heat are observed, replace the affected capacitors or rectify components accordingly.[oss-gpt-20b]