cant take picture but video is ok

after my iphone was bent i ran intoi an issue

i had no FLASH,no autofocus on rear camera and couldnot take photo with rear camera.front camera was all ok(video -focus-photo).

i have changed rear camera with another one(also original part) .Now i have autofocus ,but still cant take photo.video recording is ok.

While trying to take photo iphone shows what camera is looking at correctly,when i press capture button it blink like taking photo but saves nothing.

DFU restore didnot help