Question about Canon Rebel XT / EOS 350D Digital Camera
There are several possible reasons for it, so let me go through them, one by one.
1. Dirty or Defective lens. Check your lens, and if you have a way to get other lens to test the camera, please do it. This includes to check for proper cleaning of both the lens glass and the lens contacts.
Sometimes the iris mechanism in the lens is failing, so there is not adequate light through the lens, which causes this problem.
2. Behind the main mirror, there is the secondary mirror, which is used for auto-focus. I warn you that you have to perform the following with extreme precautions.
There is a spring that is located on the right side of the main mirror (seeing the front of your camera). such srping keeps in palce the secondary mirror. You need to move the main mirror with a tip of a pen (something plastic, not metal) without force so much such mirrors, and don't touch the shutter blades behind the mirrors.
Moving the mirrors you will see ans sense such spring. IF the spring is lose or missing, then that is the reason that such Auto-Focus is not working.
3. Dirty contacts on the camera where the lens is attached. Just clean them (No liquids. Just an eraser pencil or dry wipe will do the job).
4. Defective DC/DC board that controls the lens auto-focus mechanism. Unfortunately, only it can be confimed in a Camera repair shop.
I hope the above can help you to identify why your camera is failing.
If still you need support, please let me know.
Posted on Jul 18, 2009
I had the same problem then found this. Its a 3 hours job, you better have top quality precision screwdriver, patiente, and bit of a luck...
See this: http://users.abo.fi/jskata/300Drepair/
Posted on Aug 28, 2009
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Posted on Jan 02, 2017
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