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Kenban, how do you know there is a separate 5.4v pin? The USB cable won't show the additional connection because it will always connect to the 5V pin (assuming you are right). How did you detect that 5.4 v goes somewhere else? Did you test on the external power adapter? You could multimeter that to see what pin the center conductor was attached to. Did you do that?
If the external power connector goes to the 5.4v input, then trying to use a 5v cigarette lighter adapter is also going to lead to problems. The "blinking" phenomenon reported by some folks may be exacerbated by starting with only 5v on the 5.4v pin.
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