Introduction
If the security camera image is not clear or does not show any picture, at first, take a look at the lens of the camera. If the lens of the camera was scratched or broken follow this replacement guide to replace the broken lens with a new one.
Tools
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            On the base motherboard, there are five connecting cables. Disconnect all of them from the motherboard gently using safety tweezers. 
 
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            Remove the two 7mm screws holding the motor using a #1 Phillips screwdriver. 
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            Pull off the motor and lift away the midbody of the camera using your hands. 
 
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            Separate the black camera shroud from the upper body by prying loose the tabs with a plastic opening tool or spudger. 
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            Use your hands to wiggle the shroud free. 
 
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            Use a #1 Phillips screwdriver to unscrew the four 5mm screws on both sides of the black camera housing to separate it from white body. 
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            Unscrew the two 7mm #1 Phillips screws on both sides of the camera housing to open it. 
 
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            Gently disconnect the three cables from the small motherboard using safety tweezers. 
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            Use a #0 Phillips screwdriver to remove the two black 2mm screws and a #1 Phillips screwdriver to remove the 2 silver 6mm screws. 
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            Separate the board from the black housing. 
 
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            Using your fingers, remove the focus adjustment ring. 
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            Twist the lens to unscrew it from the camera module. 
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            Replace the broken lens with new one and reassemble all parts of the camera respectively. 
 
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To reassemble your device, follow these instructions in reverse order.