Testing the mentioned Sunny 12V 1.5A DC smps adapter worked perfectly even without the need of connecting a HV e-cap to the Omnipotence tester output! Higher max current adapters (2A and higher) probably will work too. But then the HV e-cap is probably needed and it is connected to the adapter only after it is fully charged upto at least about 300V DC to also successfully activate/test the more energy consuming adapters without much effort!

Likes(0)Dislikes(0)

PS: Did you also see my repair on Jestine's blog on the DY294?
It may also warn you never to use a unregulated 6V power adapter to power your DY294. That is how I killed mine in just seconds! But afterwards made a very usefull article about the repair that was never published before!

Likes(1)Dislikes(0)

Nice that it may have helped you to add it to your tools Waleed!

Likes(0)Dislikes(0)

By-the-way: I do not know how large your PS pwm unit is you want to fix, Lewis? But know that ATX and XT power supplies can't be tested with the presented safe testmethod because they require a too high supply current before they even start working!
That simply would require a very large (100-300 Watt?) short current protected safety power supply capable in testing also the large(r) smps units! And testers like the DY294 are because of their protective nature mainly designed to 'carefully' test small semiconductors and capacitors.

Likes(0)Dislikes(0)

If you just want to buy it to test these smaller smps 5V and other PWM chip controlled USB chargers, the last presented Omnipotence Led backlight tester is capable in delivering more test current and always works faster and better Lewis. If you however want to mainly test breakdown semiconductor voltages the DY294 is the best choice!
My previous three DY294s I bought on Aliexpress. The AR907A+ I bought in 2015 on eBay. The Omnipotence backlight tester can probably be bought on both Aliexpress and eBay. (see the Backlight tester link in the article for more info and an explaining video). Cheers!

Likes(0)Dislikes(0)