I am fixing a circuit test PSF60-12 power converter and I need help to identify an IC.

Info on the power converter (PSF60-12 ) can be found here:
https://www.circuittest.com/psf60-12-ac-dc-power-supply-60w-12vdc-5a.html

Background...
I was trying to power a 24 VDC actuator and I didn't have a 24 VDC source so I thought I could use a this AC to 12 VDC converter (supply) plus another 12 volt battery in series to get 24 VDC... well bad idea... the power supply emitted flames before a small explosion erupted although I don't fully understand why.

Here are some photos of the bad unit.


I purchased a second and took some pictures in hopes of repairing it.
Here are the photos of the good unit:


So I think I need to replace the IC and the zener diode, but anything else I should replace or check before applying ac power?

I can't identify the IC. I know the part number, but I don't know the manufacturer.
I searched
http://how-to.wikia.com/wiki/Howto_...(chip)_manufacturers_by_their_logos/all_logos
Can you identify the IC?

Thank you !

-Mark

 

Maybe this one.
https://www.onsemi.com/pub/Collateral/UC3842B-D.PDF

Mouser has them
https://www.mouser.com/_/?Keyword=UC3842BN

Good luck!

 

UC3842B series smpsu chips.

http://www.st.com/en/power-management/uc3842b.html

 

Thank you Dodgydave and JohnInTx! You are right. It is a ST Microelectronics UC3842B 8 pin DIP.

And I think the component that was destroyed was a regular diode, not a zener.

What would be the best way to choose a suitable replacement for the diode without removing the one from the good unit?

-Mark

 

Ideally it could be an ultrafast diode, best way is to look at the trackside and see where it's connected, and compare it with the schematic on the datasheet.