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Power Surge



I have a Canon T3i and I'm having a problem connecting to my Panasonic CF-53 Toughbook laptop.

I get the following error:

Power surge on the USB port
Unknown USB Device needs more power then the port can supply

I looked online and every so called fix doesn't change anything. I've had BYE work with this set up but it's unstable and eventually I get the error and loose connection to the camera.

Is there a solution?

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Well, "Power surge on the USB port" is not an error to be taken lightly.

USB ports do have power in them to power small devices.... and from this error it looks like yours is faulty and may be providing more power than it should.

If this were me I would get this fixed immediately BEFORE it starts to fry your devices.    I WOULD NOT CONNECT ANY CAMERAS OR ANY OTHER DEVICES INTO THAT LAPTOP IF THIS WERE ME.  

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Try a different USB Cable, and a different Laptop USB Port.

The T3i does NOT perform ANY Charging via the USB Port Connection, so the Laptop is either sensing a Power Drop along a Long Cable or a Partial Short between Wires or Connectors.

You other option would be to place a Powered Hub between Laptop and T3i.


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Thanks for everyone's response. I believe I've solved the issue before reading your replies.

I downloaded/updated the latest EOS Utility. After launching EOS Utility 2 and then closing the app I tried plugging in the USB from the Canon T3i. I've been actively testing it this morning and everything is working just fine. BYE connects instantly and no power surge warnings. Why this fix appears to work... I have no idea. I suspect the EOS software installed some magic voodoo.

I found this by trying to connect the camera to my Windows workstation... I got a different error, something about  a malfunction with the USB device. I did the above install and the error was gone and I could control my Canon from the workstation.

I would love to get your input or theory on what is going on.

Thanks again for responding!

Miles van Yperen



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