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<blockquote data-quote="WayneF" data-source="post: 219240" data-attributes="member: 12496">It sounds already failed and bad, or odds seem just as good that it is some other failed electronic issue.&nbsp; Like maybe corroded battery terminals not making contact is pretty common. The flash capacitor and flash tube operate on high voltage, in the order of 200 volts (bigger speedlights are often 300+ volts). This source is a power converter in the flash which runs on the AA batteries.&nbsp;&nbsp; If capacitor is the actual cause, and fresh batteries don't do it, you probably need a new flash, or at least a new capacitor (which can be quite dangerous to the inexperienced attempting to install).&nbsp; The AC power supply is NOT the answer, because if the capacitor does need forming, it just better insures the capacitor does blow up.&nbsp;&nbsp; Forming a capacitor also involves limiting the current so it does not fail when hitting it with high voltage while leaking so badly.&nbsp; External power packs generally output the high voltage directly to the capacitor, speeding up recycle (greater current capacity than the little converter).&nbsp;&nbsp; That higher current would be the opposite of limiting the current, which probably insures a very leaky one fails, sometimes with a bang.&nbsp; If not already failed... if that is the actual problem.Sorry this is no help, but the AC power is not the answer.&nbsp; It would surely still need AA batteries to power the other electronics,&nbsp; so corroded battery terminals or other issues would still be an issue.</blockquote>

[QUOTE="WayneF, post: 219240, member: 12496"] It sounds already failed and bad, or odds seem just as good that it is some other failed electronic issue. Like maybe corroded battery terminals not making contact is pretty common. The flash capacitor and flash tube operate on high voltage, in the order of 200 volts (bigger speedlights are often 300+ volts). This source is a power converter in the flash which runs on the AA batteries. If capacitor is the actual cause, and fresh batteries don't do it, you probably need a new flash, or at least a new capacitor (which can be quite dangerous to the inexperienced attempting to install). The AC power supply is NOT the answer, because if the capacitor does need forming, it just better insures the capacitor does blow up. Forming a capacitor also involves limiting the current so it does not fail when hitting it with high voltage while leaking so badly. External power packs generally output the high voltage directly to the capacitor, speeding up recycle (greater current capacity than the little converter). That higher current would be the opposite of limiting the current, which probably insures a very leaky one fails, sometimes with a bang. If not already failed... if that is the actual problem. Sorry this is no help, but the AC power is not the answer. It would surely still need AA batteries to power the other electronics, so corroded battery terminals or other issues would still be an issue. [/QUOTE]

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