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I was shooting a wedding and the 580 EX II was getting a work out as it usually does in darker than usual spaces. It worked for about 4 hours just fine, but then the flash started overexposing and then not flashing at all. I replaced the batteries in the flash and the turbo charger battery pack, but it didn't help. I had to use the on camera flash for the rest of the evening. Does anyone have any idea what happened?

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This sounds like an electrolytic capacitor in the external flash failed, and needs replacement. They're critical components of the flash unit, and do go bad in time. Usually replacing them restores the unit to a "new-like" state, and will revive the unit for years.
Another problem could be occuring with the camera circuitry, but not likely.
You can change out these caps, and they are usually available at Radio Shack.
Wish I could offer a simpler solution,but this is what I think is happening.
Good luck,and hope this helps.

Posted on Mar 14, 2011

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