If you are using this information for repair, focus on these high-failure points: Likely Culprit Blown Fuse or Primary MOSFET Check input fuse and power transistor for shorts. Flickering / Cycling Dried-out Electrolytic Caps Look for bulging capacitors on the secondary side. One Port Not Working Physical USB Port Damage Inspect the internal pins of the USB-A female socket. Low Voltage Output Feedback Loop Failure Test the TL431 and Optocoupler . ⚠️ Safety Warning
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