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Identifying D4 component on a TomTom start ?

Hello, I have a TomTom start N14644 that no longer comes up. I have opened up the unit and there is one diode shorted near USB connector that is labeled on PBC with D4. Using a lens seems that on the diode is write T M4K but i cannot identify the value or mfg. Can anyone identify this component?
Thanks in advance.
Gigi, November 2013
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