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With this disclosure, we can activate debug LEDs manually when we need them, especially for the service

team. Service usually requires debug LEDs on the boards to easily determine whether the board power is

normal or not. But with more LEDs, comes more power consumption, and more chances to have light

leakage. When a system is power consumption sensitive, or has lots of opening on its chassis, this design

can solve the low power and special chassis problems.

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