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It is common problem with this model Sony Cyber-shot DSC-S730 Digital Camera
It mostly means that Flash unit in camera id defective and needs to be replaced.Part number of flash board is given below
A1444049A... ST BLOCK ASSY
This is available online at Part Store.
If
you are not comfortable with replacing flash board then take camera to
qualified camera tech as camera will be apart for flash board
replacement.
Let me know if you want further assistance.
Thanks and Keep Visiting FixYa
You must verify how you set the flash: auto, on or off. Set it "on" and try it. If it not work so, it's out of service. In "auto" mode it's possible to not work sometimes because light sensor.
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