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  Leaky Capacitors or Glue? :/ 
 
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Dr. Peaceful Nov 27, 2006, 07:28pm EST Reply - Quote - Report Abuse
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This past weekend, I opened up my SFF PSU first time to install a new fan. I noticed a lot of milky white substance on the circuit board, especially on top, on the bottom or in between capacitors. I panicked thinking that I had blown caps in the PSU. But upon closer inspection, I realized these could be glue, instead of capacitor fluids.

After some research looking at pics of PSU circuits, I realized it is a common practice to put glue on electronic components inside PSU. Usually they use clear glue (hot glue?), but in my case milky white (epoxy?) stuff. I can understand putting glue on a coil to reduce the high pitch noise, but why the hack on the capacitors? Shouldn't the top of caps be clear of stuffs, in case it pops? Someone please explain, thanks.

Also, what color is capacitor fluid, usually? I saw some pics that it looks brownish, could it be white in color? Or other colors?

And guess what, a bad cap on the mobo / PSU could be one of the many causes of system instability -- random reboots / shutdowns, not Posting, damage components, etc. I saw some recent posts about these things, inspect your Caps, could be the cause.


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ant decto Nov 30, 2006, 06:09pm EST Reply - Quote - Report Abuse
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>> Re: Leaky Capacitors or Glue? :/
When I've seen blow caps the fluid is usually a very thin oil type solution which never dries. Often seen as a brown tinged stain on the PCB. If the gunk you see apears like candle wax or clear silicon or has any shape definition then it's not a leaky cap.

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Dublin_Gunner Dec 01, 2006, 11:07am EST Reply - Quote - Report Abuse
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>> Re: Leaky Capacitors or Glue? :/
Yeah, capacitor fluid is usually a yellowish or brownish colour.

Oh, and if it was caps that blew, trust me, you'd smell it!

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Dr. Peaceful Dec 08, 2006, 07:03pm EST Reply - Quote - Report Abuse
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>> Re: Leaky Capacitors or Glue? :/
Thank you for the info. No smell, no corrosive liquid in my PSU, just some white glue the manufacturer put on, I am pretty sure now. This tiny unit is a freaking toaster, that's why I was concerned. But the heat problem is fixed now -- I mod it to put an exhaust fan in the back. Temp drop from toasty hot (literally can burn fingers) to cool to touch. ;)

Shadow_Ops_Airman1 Dec 09, 2006, 01:06am EST Reply - Quote - Report Abuse
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>> Re: Leaky Capacitors or Glue? :/
they have not blown but are prematurly failing, i had a Skt A Gigabyte Pre AXP motherboard that was like that, after awhile the stuff will dry actually and become crustylike. Id suggest backing up your stuff or buying a new powersupply.

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ian elliott Dec 27, 2006, 04:37pm EST Reply - Quote - Report Abuse
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>> Re: Leaky Capacitors or Glue? :/
If a capacitor is leaking or bulging, then the capacitor is broken or it is on its way out.


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