Itek Atx 500W does not turn on

[falcontech]

Re: Itek Atx 500W does not turn on

no of this I had the technoware

[falcontech]

Re: Itek Atx 500W does not turn on

I put the original resistance back on, I continue to have a maximum of two volts on the 12v which then goes away and I again have the short on the 5v and no sign of voltage, we are ready to go

[CapLeaker]

Re: Itek Atx 500W does not turn on

so basically you are back to square one? It starts up, then it shuts down?

[CapLeaker]

Re: Itek Atx 500W does not turn on

take that brown goo off (between that green and yellow cables) that brown goo can get conductive over time and messes things up. So anywhere you see this brown stuff, remove it.

[falcontech]

Re: Itek Atx 500W does not turn on

so basically you are back to square one? It starts up, then it shuts down?

yes, but the voltage coming out from 12 volts is initially lower than before

[falcontech]

Re: Itek Atx 500W does not turn on

take that brown goo off (between that green and yellow cables) that brown goo can get conductive over time and messes things up. So anywhere you see this brown stuff, remove it.

ok, anyway it is a kind of glue that they put initially, a bit I took it off, but do you think the problem is on the primary or secondary?

[falcontech]

Re: Itek Atx 500W does not turn on

I found a power supply to buy the same for 10 euros, if I can't solve it I can do some tests with the working one, meanwhile in the afternoon I try to understand where this short comes from

[CapLeaker]

Re: Itek Atx 500W does not turn on

I can't see much of a problem on the output side, bedsides the -5V and -12V having two extra (smaller) diodes per rail and that is about it.
So I guess the feedback circuit next.

What short are you talking about now?

[falcontech]

Re: Itek Atx 500W does not turn on

I always have the short on the 5v that does not go away, I removed the heatsink with the schottky diodes I removed the inductance, and the short remains, I have to see what else to remove to understand where the short is on the 5 volts, in the previous message I wanted to tell you that I bought a second hand equal power supply to help me solve

[CapLeaker]

Re: Itek Atx 500W does not turn on

I thought that was due to a low ohm resistor? Your post #28.

[falcontech]

Re: Itek Atx 500W does not turn on

no, the resistance was good at the end, unfortunately I got distracted and I thought it wasn't good, instead I measured the same one in a working atx and it's good

[CapLeaker]

Re: Itek Atx 500W does not turn on

how do you power up the PSU? Mounted in a computer or outside manually forcing it to turn on?

[falcontech]

Re: Itek Atx 500W does not turn on

I'm trying it on the outside, by bridging the green wire with gnd, I've tried to disconnect all the resistende, capacitors and zener diodes that are on the way of the red wire but the short does not go away

[CapLeaker]

Re: Itek Atx 500W does not turn on

watch this: https://www.youtube.com/watch?v=HcYFbCqM61g

[CapLeaker]

Re: Itek Atx 500W does not turn on

keep taking stuff off

[falcontech]

Re: Itek Atx 500W does not turn on

ok, but also on the black rail?

[CapLeaker]

Re: Itek Atx 500W does not turn on

the black is gnd. Did you change those 2 small capacitors in between the 2 heat sinks?

[falcontech]

Re: Itek Atx 500W does not turn on

I absolutely did

[falcontech]

Re: Itek Atx 500W does not turn on

I also disconnected everything that had nothing to do with it, nothing, the short doesn't go away

[CapLeaker]

Re: Itek Atx 500W does not turn on

bad transformer?