When the camera is powered on the lens extends out and in a few times and then stays extended. I can take pictures at this point. But, when the lens T button is pushed the camera shuts down, but does not shut off when the button is pushed to W, there is no lens movement. The lens stays extended when shut off.
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My camera is stuck on the screen that says "lens error" and then has four different numbers in a row. The camera lens is fully extended and will not shut off...any suggestions of what the problem could be?
If i told you to smack it around a bit would ytou believe me?
But that is the fix Canon use to get rid of these errors 98% of the time. Charge or change the battery, insert it tuen camer on when it goes off smack it hard into your palm a few times and turn it back on. Just incase there is some dirt/dust stopping the lens from extending blow a can of compressed air around it and give it another few slaps . Sometimes after about 20-30 ngoes of this the camera will jump back into service Believe me it does work nearly all the time Canon charged me $90 to do this trick
I had exactly the same problem. Lens stayed open, when powered on you get three beeps and nothing. I found when I pulled the lens out a little harder it gave a little click. When I powered on it worked perfectly.
Try blowing lots of compressed air around the open lens shutter to clean the mechanism. Or use a hair dryer for a few seconds (don't want to heat up the camera). Also with the lens barrel extended and pointed downward, tap the lens barrel with a pencil while you extend and retract the lens by powering the camera on and off. A grain of sand in the mechanism is usually the culprit, and you want to try to dislodge it.
You can open it up, but only as a very last resort. The above procedures usually work if you try them enough. But for those particularly nasty stuck mechanisms, here's an example repair on a Canon Powershot A400 (do this at your own risk, and it will void your warranty):
Are you sure the lens is actually going all the way out? If there is debris in the zoom gearing it can cause the lens to stop extending which would in turn cause the camera to re-retract the lens and show an error.
Other possible explanations are that the sensor which determines when the lens has reached full extension has failed, so the camera keeps extending the lens until it reaches the physical limit - and then behaves just as if there was a jam as described above. The fact that this occurs both when you power on and power off the camera leads me to think this may be the case.
The loss of date and time settings is due to a dead backup battery. Check your manual to see if this is replaceable by you or if it requires disassembly.
Advance Camera Repair