Several of the Kokak digital cameras have a control knob (mode dial). The contacts on this control deteriorate because of oxidation. This will cause the camera to malfunction. Normal operation is restored by removing the oxidation. This "how to" video shows how to remove the front and rear covers of the C653 camera and polish the contacts. This procedure will probably work for similar models.
Correction: The max resolution was stated as 4 megapixels. It is actually 6 megapixels.
