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My Annke CCTV was working fine till I stupidly plugged a USB mini fan into it. The fan ran for about 10 minutes then stopped and now I have no power at all to the cctv. I’ve taken board out and where the power goes in there is a large black square component. Can anyone tell me if its a fuse. The supply is 48volts. There is no continuity across this component.

Hi @boness TVS - This is a TBS - Transient-voltage-suppression diode I see it is powered by an external power adaper. Do you have a multimeter? Measure and check on if the power adapter is giving the out correct voltages.