Canon EOS Rebel T7i won't power on after battery and card checks
Asked 1/6/2021
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2 answers
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My 3-year-old Canon EOS Rebel T7i suddenly stopped powering on. I’ve already tried charging the battery fully, swapping in other batteries, changing lenses, checking the battery-door and SD-door switches, replacing the SD card, connecting the camera to a laptop, leaving the battery out overnight, and opening the body to look for loose connections. I also read that some Canon models have a button-cell backup battery on the main board. Could that stop the camera from turning on, or is this more likely a different internal fault?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
5y ago
2 Answers
1
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.
Originally by user15871. Source · Licensed CC BY-SA 4.0
user15871
5y ago
0
Generated from our catalog & community — verify before relying on it.
The backup/button-cell battery is not likely the cause. On the T7i/800D it’s located on the underside of the main board near the left-side communication ports, and on some Canon models it may be soldered in rather than user-removable.
Even if that battery is dead, the camera should still power on with a properly charged LP-E17 installed. A failed backup battery would mainly cause the camera to lose time/date and some settings when the main battery is removed.
Since you’ve already tried multiple charged batteries, card and door-switch checks, lens swaps, and a reset by leaving the battery out, the problem is more likely an internal power or main-board fault rather than the backup battery. At that point, professional service is the realistic next step.
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