Anon 40D, can't lock ocus when press shtter button halfway ! Please help ! TIA

xtouch tablet won't switch on Anon, try holding the volume down button and the power button until android image appears. This may help reset it.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

At the top right of the back of the camera are the two buttons for AE lock and Focus point selection. One zooms in, one zooms out. Press zoom in once,.

1) CF card in camera? Won't shoot without one

2) Does mirror go up?

3) Canon had a run of bad motors for this model - if mirror does not go up, then it is the mirror motor. If mirror goes up, shutter will not fire, press release again then the mirror goes down, the shutter motor is bad (same model motor). If mirror goes up, shutter fires, both blades travel together/no exposure, probably the shutter is bad.

Sounds like a loose screw inside shorting out one of the curciut boards! tccamerarepair.com

Press and hold the release button (located on the camera body, next to the lens mount). Turn the lens counter-clockwise (approx. a quarter-turn, slightly less) and take it off.

If this doesn't work, please describe what exactly goes wrong (can't depress button, can't turn lens, etc.)

Does your blue print light come on? The blue light is just right of the menu button.

TTTTTTTTTTTTTTTTTTTTTTTTITf correct focus cannot be obtained
When the subject to be focused is not on the AF target mark (not positioned
in the center of the composition), you can use the following steps to obtain the
correct focus on the subject. This operation is referred to as "focus lock".
Determine the position of the subject after focusing (Focus Lock)
1 Press the power switch.
• The camera turns on in the shooting
mode.
• The lens extends and the monitor turns
on.
• The orange lamp lights.
2 Turn the mode dial and select a
shooting mode.
"Shooting mode" (P.36)
3 Position the AF target mark on
the subject you want to focus on.
• When shooting a hard-to-focus
subject, point the camera at an object
about the same distance away as the
subject.
Press the shutter button halfway
until the green lamp lights.
• When the green lamp lights steadily,
the focus and the exposure are locked.
• When the green lamp blinks, the focus
and exposure are not locked. Release
your finger from the shutter button, reposition
your subject and press the
shutter button halfway again.
5 Keeping the shutter button
pressed halfway, recompose
your shot.
6 Press the shutter button fully.
Try the above, info from D-535, C-370 and X-450.
I can email you the complete manual if this works.
Regards
Phillip

Try doing a reset in the camera tools somewhere, this fixed a similar problem I had.

Check this link: www.richardsnotes.org/archives/2005/04/29/50mm-lens-contact-points/

sir this is mechanical shtter operating problum ,i think this is internal gear problum repairable