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Err99 on Canon EOS 400D with Canon lens.

Started Feb 25, 2013 | Questions thread
AJohn Veteran Member • Posts: 9,461
My situation,...

...I had the err99 problem on my 350d recently. It would come and go. The problem started when the camera would lock up in many different situations and refuse to turn off. The small info LCD was even going crazy by not fully displaying all the characters.

I tried all those usual tricks you mentioned and they didn't help. Then one time when I was still able to turn it on, the LCD acted up when I would press or tap on one area to the right of the small LCD. Later, I saw on a video that there were several ribbon cables under and around that spot.

A month ago, I decided to take the entire camera apart and carefully remove every ribbon cable (I think there were 7 or 8) clean them with a cotton cloth and reinsert them. It worked. The camera has worked flawlessly ever since. Maybe that's the issue you're starting to have.

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Andy
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http://imageevent.com/ajrphotos

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