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Testing cables...killed powersupply.

post #1 of 8
8/22/12 at 9:40pm
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Hey Guys,

So I guess I crossed a wire somewhere when sleeving my 24-pin.

Sleeved a set of cables do use for my build and wanted to test them out before plugging them into the components. Had a PSU tester and thought that would work well, turns out I should have used a multimeter instead.

Tested the meter and PSU out first with the stock cables, plugged the cables in, turned it on, all looked good.

Plugged the individually sleeved 24-pin cable into the tester, plugged the stock CPU power into the tester and turned on the tester, briefly lit up and then went blank. Thought maybe a loose connection, nothing, everything in. Decided to take the custom 24-pin out and plugged the stock 24 pin in to test things out, same thing, briefly lit up and then went blank.

Figured maybe the tester was bunk, took a old PSU I use for testing loops out and plugged it into the tester. Lit up and displayed everything great. So it's not the tester. And if it's not the tester then the only thing left is the PSU, since I know the stock cables are fine.

Back to the AX750, decided to bybass the tester and just test out the PSU the old-school way using a fan and a paperclip. Shorted the stock 24-pin cable with the paperclip and plugged a fan in using the molex and a fan connector (happened to be a LED fan). Turned the power supply on, fan didn't spin but LED dimmly lit then went black.

So it looks like I f'ed up sleeving, well, at least reconnecting frown.gif

I never thought though I could kill the PSU using the tester, haha, figured that's what the tester was partially for. Lesson learned, just used a multimeter.
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post #2 of 8
8/22/12 at 9:48pm
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Ouch that sucks. Hope you figure out what Wire you crosses up.
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post #3 of 8
8/22/12 at 10:09pm
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Haha, yeah, crap happens though. Will have to wait to test the cables until next month when I get back home and have access to all my tools again... blah.
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post #4 of 8
8/22/12 at 10:32pm
Those PSU testers don't have current limit resistors on the inputs (a basic safety feature that would have increased the BOM of the device by $0.30, mostly from a very slightly larger PCB) so when you crossed two wires, plugging them into the PSU tester made a short circuit and apparently your power supply's short circuit protection wasn't operative.



I took one of those testers apart and it's one of the worst-designed pieces of crap I've ever seen. I've had essentially one month of EE training and I can design a better PSU tester than the Youngyear ones.
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post #5 of 8
8/22/12 at 10:39pm
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Yeah, didn't realize how poorly designed the testers are...super basic and under engineered. Kind of sad but certainly worth knowing.
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post #6 of 8
8/22/12 at 10:43pm
Fun fact: plug in the PCIe connector, then short all the pins on the floppy connector. If you're lucky you can set something on fire. Just make sure not to accidentally short those pins, with say sweaty hands, or you're in for a nice little electric shock.



Out of five of these that I've dealt with, two had completely out of whack PWR_GD readings due to the crappy +/-20% ceramic cap used in the timing circuit. Another one cracked its screen with a simple three foot drop. Another one was DOA. Only one was fully functional, but it read the +12V rail as 0.20V higher than a DMM.


Absolute garbage. I have half a mind to buy and dissect one.
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post #7 of 8
8/22/12 at 10:47pm
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Wow! Are they really that poorly done? Haha, That is terrible but amazing lachen.gif
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post #8 of 8
9/3/12 at 8:56pm
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Well the new PSU is suppose to arrive tomorrow, at the place I am moving to....won't be there for a week though so I thought I would check any make sure I read the pinout correctly....

colored the pins since it's easier for me to follow to me than the table provided... that look right?



Assuming that is right, I did have two wires out of place...fixed now.
Edited by deafboy - 9/3/12 at 9:37pm
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The Ultimate Cooling Machine
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For Sale: [For Sale]: Logitech G930 Headset
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Lampron FC-5V2 Copper Tubing w/ push fittings XSPC GTX680 Water Blocks Windows 8 Professional 
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