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IR Light source problem

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man009

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Hello
I am having IR cctv camera in which IR light source is using KIA78R12API regulator and two pin Light sensor , 24 IR LED and 8 PIn SMD IC EZ642(ST) and few more components . In this regulator IC is getting much heatup , why ?? I couldn't get the faulty component ?
Will you please help me to solve the problem
Thanks in advance
 

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