I bought a cheap LED strip with a power supply unit from Aliexpress. After using it for some time I noticed that PSU is overheating in one spot to the point where the label looks burned.

I opened it and it looks like the bridge rectifier TD1KN is overheating. The PSU is rated @ 12V/5A, the LED strip draws 1.1A. The datasheet of the rectifier specifies the max current is 1A (if I'm reading it correctly). If so, does it mean 5A on the label is a lie? (see comments)

Should I be worried? Can I fix it? Should I buy a new PSU?

Edit: looks like the cap is busted. Could it be the culprit or maybe it got damaged because of the temperature? (it's right on the other side of the board)

  • \$\begingroup\$ The rectifier is on the 120V mains side. Even if you pulled 5A out on the 12V side that rectifier would only see a little more than 0.5A. \$\endgroup\$
    – brhans
    Apr 2, 2021 at 1:51
  • \$\begingroup\$ Is it? I thought it would be after the transformer?.. \$\endgroup\$
    – torvin
    Apr 2, 2021 at 1:53
  • 2
    \$\begingroup\$ That's a switch-mode power supply. \$\endgroup\$
    – brhans
    Apr 2, 2021 at 1:55
  • \$\begingroup\$ I see, thank you! \$\endgroup\$
    – torvin
    Apr 2, 2021 at 1:55
  • \$\begingroup\$ I stopped reading after you said this: I bought a cheap LED strip with a power supply unit from Aliexpress \$\endgroup\$
    – Andy aka
    Apr 2, 2021 at 8:06


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