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Oh to get my hands on a unit that I could take apart and map - started building, and taking apart, electronics units in the days of valves, now I build and repair computers and repair notebooks.
Try and trace the LED power line and somewhere you should encounter an electronic switch - either a single IC or an IC and transistor (IC will most probably have 8 pins). The photos that have been posted aren't good enough (clean well focused and evenly lit) for me to use to try and trace and give advice as to where to look.
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