Question 450watt power supply 5v, 3.3v short to ground wire,in output rail ,connectors

[meganrussel]

hello everyone , working zebronics power suply 450 watts , 5v ,3.3v givin short to ground black wire, also in circuit at output, resistor was charred but shows right values , after removing resistors 39ohms, 51 ohms, there was no short , no continuity beeps with ground , but after replacing new resistors (now i am not switching it on) ,again short still exists . when i put bigger ohm resistor like 100k ohm , no short beeping sound comes , lower ohm resistor gives continuity beeps ,other big ones donest , as its a working psu , i am confused what to remove now or how to go further now .
how this happend - i was putting a bad sata cable extension which blew the 12v/5v diode(not sure) in hdd pcb ( repaired it -working now) and made this short in psu , how to remove the short , thank you .what problem this short can cause to mobo and hdd ? i am not sure this short caused hdd 5v or 12 v diode break or the bad hdd sata cable caused this , but when the hdd gone bad , the other 2 hdd were working normally and computer was still power on , i checked the power cables black wire(ground) short with red wire (5v ) , then short with 3.3v orange wire , i know this is not normal , so i dint put this psu again in my computer ,i wana remove the short, guide me , thank you

 

[meganrussel]

//ibb.co/2vwyb7g
//ibb.co/BtvccmD
//ibb.co/xq8vr6g
//ibb.co/jJwkBWS
//ibb.co/RPZH11j
these are the pics, i dont know how to upload here , thank you

 

[Unolocogringo]

To be honest your power supply is a fire hazard. And parts killer.
It would be best to replace it if any way possible.

 

[meganrussel]

but its working , i did have replaced it with other, i would like to fix this , but could you please help me with that, the only thing is its ground shorted with 3.3 v and 5v , please guide me with some chek points , thank you

 

[--SID--]

Why do you want to fix a PSU that's not worth to fix?

 

[DSzymborski]

Not turning on at all is the optimal state for this PSU.

And even if this were a good PSU, this is safety equipment that someone can kill themselves working on in with the right/wrong set of conditions, so the fact that you want a "guide" to repair this PSU indicates that you're unqualified to safely do this in a first place.

 

[meganrussel]

Why do you want to fix a PSU that's not worth to fix?

i tend to use this psu for case fans and power hhd or dvd drive occasionally . as this had a continuity on 3,3 and 5 v with ground with load resistors ,i wanted to ask about it.

 

[Unolocogringo]

Not turning on at all is the optimal state for this PSU.

And even if this were a good PSU, this is safety equipment that someone can kill themselves working on in with the right/wrong set of conditions, so the fact that you want a "guide" to repair this PSU indicates that you're unqualified to safely do this in a first place.

Thanks for your answer.
I was afraid to answer in a similar manner.

There are 2 caps rounding on top, one has swollen sides , obvious for someone who knows what they are looking for.
edit.
I forgot to mention obvious burn mark on the back side of pcb.

 

[meganrussel]

Not turning on at all is the optimal state for this PSU.

And even if this were a good PSU, this is safety equipment that someone can kill themselves working on in with the right/wrong set of conditions, so the fact that you want a "guide" to repair this PSU indicates that you're unqualified to safely do this in a first place.

it turns on , it runs with stable voltages , checked it with both paper clip test and psu tester .the values are 5.01 v , 3.38 v , 11.87 v in paperclip test , and in psu tester , i get full 12v and other volts same . i ran for about few mins , the values are stable . i can be careful if i get the guidance , i am just curious and learning about this continuity in 3.3 and 5v with ground in cable and circuit , which donest happen in other psu i have - in other psu i checked only the cables - there was no continuity in 5v and ground but the psu in discussion is having it . may be the make of both psu is different ??

 

[meganrussel]

Thanks for your answer.
I was afraid to answer in a similar manner.

There are 2 caps rounding on top, one has swollen sides , obvious for someone who knows what they are looking for.
edit.
I forgot to mention obvious burn mark on the back side of pcb.

yes sir i see those caps slightly bulged at tops , i tend to change it sooner . burn mark ?? where is it , do you mean that darker area at primary side ?

 

[Unolocogringo]

This pic. Three pads in a row burnt.
About center of board F/B and 1/4 down from T/B.
//ibb.co/BtvccmD

 

[meganrussel]

This pic. Three pads in a row burnt.
About center of board F/B and 1/4 down from T/B.
//ibb.co/BtvccmD

oh thats mosfet in primary side , it was already like that .

 

[USAFRet]

Do you want the answer YOU want to hear, or do you want the real answer you need?

 

[meganrussel]

i got all the answers i need, thank you all

 

[DSzymborski]

it turns on , it runs with stable voltages , checked it with both paper clip test and psu tester .the values are 5.01 v , 3.38 v , 11.87 v in paperclip test , and in psu tester , i get full 12v and other volts same . i ran for about few mins , the values are stable . i can be careful if i get the guidance , i am just curious and learning about this continuity in 3.3 and 5v with ground in cable and circuit , which donest happen in other psu i have - in other psu i checked only the cables - there was no continuity in 5v and ground but the psu in discussion is having it . may be the make of both psu is different ??

Any piece of garbage can be stable without a load. A real load requires proper equipment; let's see what those voltages are in a group-regulated unit when you have the +12V loaded heavily with the GPU and CPU power. That you haven't considered all of this and think testing a PSU is just sticking in a $10 tester and seeing what the voltages are is, again, a strong indication that you don't have even a fraction of the expertise that would enable you to diagnose the problems and implement a solution.

Sorry to be so direct, but this is dangerous stuff.