Repair guides and support for the Canon Speedlite 430EX II external flash assembly.

11 Questions View all

Why isnt it turning on?

I checked the batts, even tried new ones and still it wont turn on. Is there some explanation for this? I really confusing and i really would like to know the problem before i buy a new one

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1 Answer

Chosen Solution

Check the battery contacts for corrosion - typewriter eraser pencils are ideal for polishing the contacts. The ON/OFF switch can fail - try pushing down as you slide the switch. The switch can be repaired for less than the cost of a new flashgun, as long as you don't go to Canon that is...

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Mine did the same thing, and it was battery corrosion - only a tiny bit, barely noticeable, but enough to break the contact. Rubbed it with the eraser end of a pencil, and put the battery back in and it worked. I'll now get some rubbing alcohol and clean it properly.

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Was about to replace my $300 Speedlite 430EX II, came here, checked the contacts in the battery compartment and boom! Quick scrape and all good.

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Thank you guys, had the exact same of the battery compartment with the corrosion. Glad I found this.

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