Repair guides and support for the third-generation 5D, a DSLR camera released by Canon in 2012.

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err 40 at power up


my camera 5dmk3 power up correctly but it returns err 40. could it be an issue related to the PCB bottom or the DC-DC PCB, what's your opinion regard it?

I tried to load / access to your canon eos 5d mark 3 parts catalog , but it does not loaded. Is it in progress or is it not available?

Thanks in advance


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Giorgio Ba err40 is most commonly an electrical error. It can be related to the battery (first thing I'd replace) but also with the flex cables going to the DC-Dc board etc. Not sure why the parts catalog does not download for you. Added it on here==>>EOS 5D Mark III Parts Catalog

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Hi Giorgio.

Did you find out what was wrong?


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Giorgio Ba will be eternally grateful.
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