One of my wall lights has stopped working. It has three small led bulbs all of which work. I have tested the power supply with an eletricians screwdriver and there is power going into the transformer and the two wires coming out of the transformer are both live - but no light! Sometimes when the screwdriver touches the terminals the bulbs light up and then go out, but mostly they don't. As the light was quite expensive I don't really want to replace it but am at a loss to know where to look next unless I take the light apart to see where the two wires coming out of the transformer go.
What you call "electricians screwdriver" is in actual fact a potential killer, and electricians do not use them because of this fact, the screwdrivers also "lie" (As you have proven) With this fact on mind, I would suggest you put your "electricians screwdriver" in the bin while you are still able to do so, then invest in a multi-meter and learn how to use it. (Would you try to lay bricks without a trowel) You can buy a multi-meter for around £10, and not only will it tell you what is wrong it has many other uses too. Don't forget, bin that screwdriver.
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