Power supply model 450watt, 5v and 3.3v short circuit to ground, output rail connectors
Power supply model 450watt, 5v and 3.3v short circuit to ground, output rail connectors
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
Be honest, your power supply poses a fire risk and could damage components. It would be wise to replace it whenever possible.
but it's functioning properly now. I replaced it with different components, but I need your assistance to fix this issue. The main concern is that it's shorted between 3.3V and 5V. Please check the relevant points and let me know if you need further guidance. thank you
You might want to replace a PSU if it's no longer reliable or efficient, even if it seems fine at first glance.
Not activating at all is the best option for this power supply unit. Even if it were a reliable one, this is safety gear that could endanger someone working on it under the right or wrong conditions. The need for a repair guide suggests you lack the qualifications to handle this safely.
I usually rely on this PSU for case fans and power HDD or DVD drives. Since there was continuity at 3.3 and 5v with ground using load resistors, I wanted to inquire further.
Thank you for your response.
I hesitated to reply in a comparable way.
There are two caps with rounded tops; one shows swollen sides, which is clear to someone familiar with the details.
Edit.
I didn't mention the obvious burn mark on the back side of the PCB.
it turns on and operates with consistent voltages. I verified using both a paper clip test and a PSU tester. The readings were 5.01 v, 3.38 v, and 11.87 v in the paper clip test, while the PSU tester showed full 12v and other volts consistently. After running for a few minutes, the values remained stable. I’m just curious about this continuity at 3.3 and 5v with ground in the cable and circuit—something I haven’t seen in other PSUs I’ve tested. It might be due to differences in the PSU models?
yes sir i notice those caps are slightly bulging at the tops, which makes me change them more often. The burn mark is located on the darker area on the primary side.