I cant help you if there is no number printed on the chip.
This is needed to know what the function is.
But, to me it seems more a dc/dc chip instead of a regular usb chip.
However if you missing only the 5v for the usb, and the box works further fine you can (maybe) use a usb hub with his own power supply to solve the usb issue.
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Doing nothing leads to nothing.

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Johnny B.

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