Itek Atx 500W does not turn on

[falcontech]

Re: Itek Atx 500W does not turn on

mmmmmm I don't know, do I try to detach them? which one should I take out of the three?

[falcontech]

Re: Itek Atx 500W does not turn on

or is there a way to test them?

[falcontech]

Re: Itek Atx 500W does not turn on

now I try to remove the TL494 let's see what happens

[falcontech]

Re: Itek Atx 500W does not turn on

I removed the bigger transformer but it is not that, I have removed the TL494 and it is not that, there is crazy going out

[falcontech]

Re: Itek Atx 500W does not turn on

it's not even the central one that causes the short, I'm removing them one at a time

[CapLeaker]

Re: Itek Atx 500W does not turn on

all you can do to test a transformer is check every winding for continuity and that other windings aren't shorted to one that shouldn't be. Other than that, to properly test a transformer you need a ring tester.

Is a ceramic disc capacitor shorted maybe?
The TL494 is on the primary winding, so it wouldn't cause a short on the secondary as they are isolated from each other.

[falcontech]

Re: Itek Atx 500W does not turn on

what would this ceramic disc capacitor be? I do not know

[falcontech]

Re: Itek Atx 500W does not turn on

ok I understand what are, tomorrow check, multimeter in diode test position?

[CapLeaker]

Re: Itek Atx 500W does not turn on

either diode or ohms. diode check gives you a continuous beep if something is shorted.

[falcontech]

Re: Itek Atx 500W does not turn on

three of these capacitors I had tried to pull them out of the circuit to test if the short was gone but I have not tested them individually

[CapLeaker]

Re: Itek Atx 500W does not turn on

well... that is a plus for a change!

[falcontech]

Re: Itek Atx 500W does not turn on

but when I unplugged them the short was not eliminated, tomorrow I will try them all individually

[CapLeaker]

Re: Itek Atx 500W does not turn on

Arrrgh! I am ready for feeding a lot of power backwards and see what’s gonna blow up!

[falcontech]

Re: Itek Atx 500W does not turn on

[falcontech]

Re: Itek Atx 500W does not turn on

I found a ceramic capacitor roasted on the primary, unfortunately the number is no longer visible, I removed it but the short remains

[falcontech]

Re: Itek Atx 500W does not turn on

Even if the last transformer is removed, the short persists

[CapLeaker]

Re: Itek Atx 500W does not turn on

send a picture as the PSU is at the present time, top and bottom.

[falcontech]

Re: Itek Atx 500W does not turn on

ok

[falcontech]

Re: Itek Atx 500W does not turn on

here they are, I showed you where the broken ceramic capacitor was

[falcontech]

Re: Itek Atx 500W does not turn on

so what do you do?