Need help with finding short on pcb

Thread Starter


Joined Nov 5, 2022
I've bought a WiFi Smart Aroma Diffuser in repackaged condition, but as I've tried to use it, it didn't seem to work, as well a spark was visible when I tried to reconnect the power cable. I've disassembled it, and started testing the pcb, and I've noticed that the main power cables are shorted, but after hours of trying I couldn't manage to find the source of the problem.



Joined Jul 10, 2017
D2 looks a bit discolored. Have you tested any of the components on the board, especially around the power input? U4 is a buck regulator and it will be the first active component in the power supply.