I've noticed this behaviour with a number of cheap Asian consumer products I own eg Draco HDT-2 7700 DTB-T set top box, HAYEAR digital microscope camera etc. The Draco runs directly off 220VAC, the Hayear takes a DV12v supply. Both devices have power buttons on their front panels but they power up as soon as they're turned on at the mains, bypassing the panel button. The button will turn the device off. Why is this so common? Is is just a bit of corner cutting on the power supply circuit design?
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