Canon T7i- won’t power on

Question

My 3 year old Canon T7i suddenly decided to stop turning on.  I’ve tried everything including

powering the battery fully
replacing the battery twice
changing the lense
switching the microswitches on the battery and SD card doors
replaced the SD card
connecting the camera to my laptop
leaving the fully charged battery out overnight
opened the camera body to check for lose connections

Still won’t power on.  Any other tips?
I searched online and found the t6i has a button cell battery on the main board.. but i didn’t see one on mine. Perhaps it’s on the underside of the board.
Anyone have internal schematics of the T7i body?
I contacted a local repair shop and he told me to send it to canon... I don’t want to pay $400 to repair it when I could buy a t8i body for $750....

Michael C · Answer

The "button cell" is on the underside of the board near the communication ports on the left side of the camera, as viewed by the photographer when looking at the back of the camera. It can be seen in this picture of a T7i/800D main board, viewed as it would be seen from past the lens in front of the camera.

Please be aware that some of these are soldered in on some Canon models, even though they appear at first glance to be inserted into a holder.
But a dead time/date battery should not prevent the camera from powering up when a properly charged LP-E17 battery is inserted in the camera. It would only prevent the camera from retaining time/date/settings when the LP-E17 is removed.
Your issue is likely elsewhere.

Canon T7i- won’t power on

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