I have switch mode power supply (SMPS) rated for 32V 50 watt. I plugged it in main AC, checked its output then unplugged it.
Then to put the SMPS back into its casing, to be on safe side I (tried too) shorted 400V filter cap but accidentally shorted it with something else, the SMPS stopped working after that
Upon diagnostics (randomly probing components) I found a Zener diode completely shorted (aka closed) in both directions and behaves the same way out of the circuit board.
Zener have no other markings other than 24 written on it so can I assume its breakdown voltage is 24V? Also, what other components might have gone bad because of it.
My (blind) guess: it is used for some over voltage protection because I didn't find any other bad component on input or output side, the UC3842 also appears to be fine.
The problem is, I cannot find any 24V Zeners on similar electronic circuits like SMPS or UPS kits, what else can I replace it with?
Note: The SMD transistor is so tiny that I only managed to guess its marking using optical lens.
The cathode of the Zener is connected to Vcc.