Well, that sounds like a switch mode psu to me. Normally though those chips
are protected for mains surges etc as early ones would die if a switch to a
motor was sparking, or in the case of a Samsung fax machine i had a
lightning struck half a mile away!

Brian

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"R D S" wrote in message
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On 10/04/2021 12:10, Dave Plowman (News) wrote:


Depends what you mean by cycle.


The power was turned off and on at the CU numerous times while I was doing
a job.

I've had the back off the TV, there's an IC on the power board with a
crater in it.