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I just bought a new LED lamp and, when I turn it on, it slowly turns off in a few seconds. Why does it so that? Is there a way to fix it?

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    What make and model is this LED lamp? It sounds rather...returnable to me. – ThreePhaseEel Aug 13 '17 at 23:44
  • It's a mainstay LED desk lamp – Kookie Alien On Earth Aug 14 '17 at 0:44
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The lamp is defective so return it for a replacement.

If you search on Google for "mainstay LED desk lamp" you will quickly see that this is a relatively inexpensive light and so trying to repair it is next to impractical. A light like this that directly connects to the AC mains:

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...will have an electronic circuit board inside that converts the line voltage to the low voltage for the operation of the LED(s). That circuit appears to be bad and I can tell you that they are often really low quality so a faulty one is not surprising.

  • Um this is so weird this afternoon I turned it on to check if it would work and forgot to turn it off but after a while it turned on by itself and started working. I turned it off to check and it works perfectly fine now.. – Kookie Alien On Earth Aug 15 '17 at 4:11

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