SMPS P/S Thyristor Question

[tech2014]

I have a power supply with a blown fuse. I did some testing and found a thyristor that measures 23 ohms from cathode to gate. I know anode to cathode is supposed to be open , but is 23 ohms normal for a thyristor. I have never tested one before. See data sheet below.

https://cdn.badcaps-static.com/pdfs/...f6f527f089.pdf

[ReeceyBurger123]

Re: SMPS P/S Thyristor Question

Sort of answering your on question. Also are you using diode test on your meter ?

[tech2014]

Re: SMPS P/S Thyristor Question

I used the diode function and resistance.

[ReeceyBurger123]

Re: SMPS P/S Thyristor Question

Sounds like its failed then bud.

[tech2014]

Re: SMPS P/S Thyristor Question

thanks bud, appreciate it.

[ReeceyBurger123]

Re: SMPS P/S Thyristor Question

No worries mate, you should check the driver circuit and other related devices in that area as it could have damaged something else when it blew.

[tech2014]

Re: SMPS P/S Thyristor Question

yeah I tested all the diodes/transistors/mosfets and all measured good.

[stj]

Re: SMPS P/S Thyristor Question

is it directly across the output and ground?

[Behemot]

Re: SMPS P/S Thyristor Question

Isn't there some resistor across it? There are often some near these semiconductors. Better remove it and check out of circuit.

[budm]

Re: SMPS P/S Thyristor Question

You should at least show us good clear pictures of the board and also the location where this SCR is and how it is being used in the circuit so we do not have to guess how it is being used.