Burnt ATX male header

V

valis1

Limp Gawd
Joined
Dec 11, 2010
Messages
183
What type of symptoms should I expect to see with these particular pins being burned? Whats the best way to repair this? Though, I'm more curious about the symptoms.

R: 21, 22, 23
L: 6, and 4 (4, not really burned)

r7m5pd.jpg




Diagram:
preview_html_783fe8a.png




PSU ATX female header voltages are within normal (expected) values. PSU is fine.
 
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Looks like something is drawing way too much current or Bad PSU/Mobo. Also, that board looks really dirty, maybe something shorted?

The best way to fix this after cleaning the board (with canned air and a bristle brush) is to de-solder the connector and replace with a new one. First, however is to find out what caused it in the first place.
 
That pinout table needs to be flipped upside down to match the connector on the motherboard. IOW the burnt pins are actually 21, 22, 23, 6, and 4, and that makes sense because they all go to the +5V rail (red wires, unless the PSU cables are sleeved or are molded ribbons). I'm not sure what parts of your motherboard use +5V, but the USB ports definitely do, and there's a good chance the memory voltage converter uses it, too, and any PCI slots (but not PCI-E) have some +5V power pins.

It's best to replace the whole 24-pin connector, but that requires a powerful soldering iron, probably at least 50-60 watts (meaning you'll want a temperature regulated one to avoid overheating the board), and you should first practice on some junked motherboards. OTOH there's a good chance you can clean up the burnt pins well enough with a tiny brass or nylon brush and some carbon solvent made for carburetors (PB Blaster, carb/throttle body spray). Try not to get any of that solvent on the circuit board -- hold the connector so it faces downward so the chemical drips off. When you discover that it doesn't work (about the only solvent that does work is nasty oven cleaner), try scraping with a jeweler's screwdriver or dental pick.
 
larrymoencurly said:
That pinout table needs to be flipped upside down to match the connector on the motherboard. IOW the burnt pins are actually 21, 22, 23, 6, and 4, and that makes sense because they all go to the +5V rail (red wires, unless the PSU cables are sleeved or are molded ribbons). I'm not sure what parts of your motherboard use +5V, but the USB ports definitely do, and there's a good chance the memory voltage converter uses it, too, and any PCI slots (but not PCI-E) have some +5V power pins.
Click to expand...

That readout makes sense. The motherboard is a EVGA 750i and I do have a old motherboard to pull the header off, it's a PITA with a 30w iron. I do have a 85w iron, but it's not effective with the blunt head.

I've got 2 fans on 5v mollex, 5 other fans using the connections on the motherbard, 1 SSD drive, 2 IDE (SATA), I've noticed 2 fans that stopped (stiff) working, disconnected and pulled them out. 460 GTX using 2 PCI power connectors, but not sure if that's 12v. Soundcard on bottom PCI slot, no other items in PCI.

The only issues I see with the system is on W8 boot up and applications begin to start to load, its awfully slow, and sometimes while playing a video the sound/video will stutter during resume. As well the mouse will lag directly after an application which requires a mouse/keyboard hook. Also when opening an explorer window, view drive content, the window will take a second or two to populate or it lags then stops. Also, when any antivirus smartscan/startup scan begins to run the system seems very laggy, mouse jumps/stutters while using it, once the scan completes everything seems normal.

As for the PSU, I shorted out 15/16 and all voltages check out as they ought to be, though the ps_on# voltage I wasn't able to get a readout with it shorted, it just read 0. Pins on the PSU header didn't seem burned at all, but plastic around 1 or 2 of the corresponding pins is chipped off on the very edge. As for board cleanliness, its clean, but some of the fans had a cake of dust on them. Other than that I cleaned everything up and used some hydrogen-peroxide cotton swap and toothbrush as well cleaned the ATX header.

PSU readings:
~Removed by me



*I'll attempt electrical contact cleaner next time, hopefully that'll do the trick. No way will I attempt it with carb/oven cleaner... why you would mention anything for the sort is just absurd, doubt you've done it, if you had you'd know it destroys electrical components and leaves behind nasty residue. Glad I thought it through, before attempting your suggestion. I use brake cleaner all the time on my vehicles, over carb cleaner, brake cleaner is safer... but would never use it on electrical components.

Should I be worried about the broken dividers on the ATX header?
Could it be that a failing drive, now RMA'd and replaced, or a fan cause these pins to burn out?
 
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radgoos said:
I think he's talking about this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16812200121

not sure how that will fix the connector on the board though....
Click to expand...

Well that wouldn't clean/repair the ATX header at all.

Anyway came back to update. Used a dental pick to clean the male pins on the motherboard ATX header and the system is working much better now.

The only real solution is to replace the board, or a 60/80 watt (adjustable) soldering iron to replace the header.
 
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