The DC rails on this failed switching power supply from a wall wort AC adapter, were shorted together. It could be one of 4 components: 2 electrolytic capacitors, a surfacemount ceramic capacitor, or a surfacemount Schottky diode. Started desoldering each one and testing for the short. It cleared when the Schottky diode (SK26) was removed
I don't think I have a high current replacement diode in this form factor.
#electronics #repair #SchottkyDiode
I do have a 1N5822 Schottky
Comparing datasheets
SK26 60V 2A
1N5822 40V 3A
The voltages on this side of the switch mode power supply are not expected to be much higher than 12V DC. This wall wort is rated at 600mA 7.2VA. The electrolytic caps are only rated up to 16V
Will it work?
#electronics #repair #switchmode #powerSupply #Schottky #Diode
And the deed is done!
Unfortunately it still doesn't work. LED doesn't light and still reading 0V on the DC side. Something else on the PCB must have failed. The 1N5822 still seems fine so perhaps the SK26 had failed first and took out other components.
Probably will just scrap it for parts. These wall worts cost £12 at Asda if I ever need new one.
Desoldered the power MOSFET (N-Channel 2N60F) which still seems to be good. Not quite logic level but I might find a use for it in a project.
One of the surface mount signal transistors might have failed. I won't bother desoldering those as I already have so many.
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