Canon Community

vencislav95 · ‎06-03-2013

HI, everyone 🙂
I have a canon speedlite 580ex II. But suddenly when I had made photos it started to flashes at full power. Help me. What could be the problem?

hsbn · ‎06-04-2013

Do you use pocket wizzard or other radio trigger by any chance?

I found this document "http://lpadesign.com/580EXII.pdf" I don't know if it could be your problem or not. But here is the excerpt:

"The symptom of the failure is that the 580EX II will no longer output controlled amounts of light. It will
only output full power dumps. This full power dump will happen even on a pre‐flash, therefore leaving
no stored energy within the capacitor left for a main flash exposure.
The testing quickly revealed that an IGBT (transistor) within the flash is damaged. This part is made by
Renesas (part # RJP4301).
The IGBT is used to turn off the flow of current through the flash tube when the desired amount of light
has been reached. This IGBT is also used to control (modulate) the brightness of the light when in HSS
(High Speed Sync) with the help of a fiber optic cable feeding a light sensor within the main body."

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vencislav95 · ‎06-18-2013

Hi 🙂
Thank you @hsbn. I have changed part #RJP4301 as you said and now the flash works correcly. Thank you so much 🙂

Skirball · ‎06-18-2013

That's interesting. Glad you got it fixed. Nice find HSBN.

Rez · ‎08-29-2013

Hi Could you please direct me as where and how I can fix this capacitor in 580 exii ? thanks already

Stephen · ‎08-29-2013

We just wanted to let you know that we don't recommend do-it-yourself repairs. So, if you’re experiencing a problem with your Speedlite 580 EXII, it’s best to let a professional Canon Factory Service Center Technician do the work to keep you and your gear safe.

Rez · ‎10-08-2013

I think someone has to be kind here and draw a sketch showing how one can do the repair,its not fair I pay that much to canon when i bought this new only 15 month ago with little usage .

The cheapest repair is around £200 ,WTF

jarl69 · ‎10-08-2013

Hi ..... I have the very same problem as you... i have down loaded a manual, but it is way above my experience. could you tell me where and who did this for you ? ? or did you do it your self. really don't want to pay canon prices, well really cannot affford canon prices. Thanking you ion anticipation of your reply. Regards Karl

vencislav95 · ‎10-30-2013

Hello there!
I bought an IGBT (transistor) (part # RJP4301) from ebay. After that I changed it. It`s cost me 5$.

PS: But after that i had to change and my bulb and some other elements.

Rez · ‎10-30-2013

Hi,Got my part a month ago but dont know where is it in the circuit ,could you direct me where and how to get there,would be a big help to many like me-thanks already

stivsan · ‎06-15-2014

hi. i have the same problem. howe thit u change it? do you have pictures?

vencislav95 · ‎06-30-2013

HI 🙂
I have this problem again. My flash failed. I used yongnuo 622c. And after that, it suddenly started to flashes at full power. Can yongnuo 622c to cause this problems?

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speedlite 580ex II flashes at full power