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The Sony Cyber-shot DSC-HX400V is a hyperzoom bridge digital camera that features a 20.4-megapixel Exmor CMOS sensor and 100-times digital zoom.

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Is there an internal battery?

My camera will no longer turn on or display a menu with or without a charged battery and plugged into usb charging. Is there an internal battery that might need to be replaced and how would I go about doing that?

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@dwjohnson30243 yes, it does. Sony part number for that is 1-756-710-12 and it looks like this

Block Image

It is soldered to the mainboard

Block Image

Use something like this teardown Sony Cyber-shot DSC-HX400V Teardown to get to it :-)

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Soldered? So Sony doesn't consider this user replaceable?

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@dwjohnson30243 Nope! OEM's do not consider anything user replaceable if they can make a buck on it.

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