With the board powered on (and with extreme caution), measure the voltages on the output connector. You should see:
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For the uninitiated, the term "SMPS" refers to a power supply that uses a switching regulator to convert electrical power efficiently. Unlike linear power supplies, which are bulky and inefficient, an SMPS like the HYS3C210-CS is compact and powerful, making it the ideal choice for modern, space-constrained active speaker systems. With the board powered on (and with extreme
Using a multimeter in diode mode, test the Schottky rectifier diodes (often labeled SB260 and SB160). A healthy diode will conduct in one direction and not the other. A shorted diode will conduct (or beep in continuity mode) in both directions. Replace any that are faulty. If you share with third parties, their policies apply