Thank you @ton618, your answer was the most relevant and informative that I've found on this topic. I had a similar issue but the cause was different, so I'll explain here so others can benefit.
My Canon 7D fell about two feet onto pavement. After that the camera would do nothing except show the blinking battery symbol on the top LCD. If a fully charged battery was left in overnight it would be dead by morning. I also have a 5Dii and a charger which shows charge level that I could use to verify the state of the battery.
The cause was one of two (or both) things.
First the power board (as described by @ton618 ) has a metal shield over it, top and bottom, presumably to shield the rest of the camera from the EMI that switching regulators will generate. Three edges of the top shield are held in place by very small clips on the PCB. That shield had escaped its clips from the shock of the drop and could have been shorting some components on the power board.
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Second, the power board is held in place by two screws and connects to the motherboard by one of the push-on type of connectors. There is no cable in between, each side of the connector is soldered directly to the PCB it is on. The power board looks as if it may have rotated a bit, causing some of the pins in the connector to lose contact.
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Second, the power board is held in place by two screws and connects to the motherboard by one of the long rectangular push-on type of connectors. There is no cable in between, each side of the connector is soldered directly to the PCB it is on. The holes in the power board are a fair bit larger than the screws so there is ample opportunity for the connector to be poorly connected, or even not connected at all. In my case the power board looks as if it may have rotated a bit, causing some of the pins in the connector to lose contact.
After re-seating the metal shield into its clips and reorienting the power board to mate the connector correctly, everything works again.
Thank you @ton618, your answer was the most relevant and informative that I've found on this topic. I had a similar issue but the cause was different, so I'll explain here so others can benefit.
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My Canon 7D fell about two feet onto pavement. After that the camera would do nothing except show the blinking battery symbol on the top LCD. If I left the battery in overnight it would be dead by morning. The cause was one of two (or both) things.
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My Canon 7D fell about two feet onto pavement. After that the camera would do nothing except show the blinking battery symbol on the top LCD. If a fully charged battery was left in overnight it would be dead by morning. I also have a 5Dii and a charger which shows charge level that I could use to verify the state of the battery.
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The cause was one of two (or both) things.
First the power board (as described by @ton618 ) has a metal shield over it, top and bottom, presumably to shield the rest of the camera from the EMI that switching regulators will generate. Three edges of the top shield are held in place by very small clips on the PCB. That shield had escaped its clips from the shock of the drop and could have been shorting some components on the power board.
Second, the power board is held in place by two screws and connects to the motherboard by one of the push-on type of connectors. There is no cable in between, each side of the connector is soldered directly to the PCB it is on. The power board looks as if it may have rotated a bit, causing some of the pins in the connector to lose contact.
After re-seating the metal shield into its clips and reorienting the power board to mate the connector correctly, everything works again.
Thank you @ton618, your answer was the most relevant and informative that I've found on this topic. I had a similar issue but the cause was different, so I'll explain here so others can benefit.
My Canon 7D fell about two feet onto pavement. After that the camera would do nothing except show the blinking battery symbol on the top LCD. If I left the battery in overnight it would be dead by morning. The cause was one of two (or both) things.
First the power board (as described by @ton618 ) has a metal shield over it, top and bottom, presumably to shield the rest of the camera from the EMI that switching regulators will generate. Three edges of the top shield are held in place by very small clips on the PCB. That shield had escaped its clips from the shock of the drop and could have been shorting some components on the power board.
Second, the power board is held in place by two screws and connects to the motherboard by one of the push-on type of connectors. There is no cable in between, each side of the connector is soldered directly to the PCB it is on. The power board looks as if it may have rotated a bit, causing some of the pins in the connector to lose contact.
After re-seating the metal shield into its clips and reorienting the power board to mate the connector correctly, everything works again.