I can't find anything related to this part. The SMD marking is D8H9A and the package is SOT23. It looks like a MOSFET to me, but not 100% sure without the datasheet. It's shorted and I have other boards with the same part burned.
Here are a couple of good SMD Code sites. The code alone is usually not enough as many devices may have the same code, such as D8. But it is a good start and it helps to have an idea of what the device is and what it might be used for.
jpanhalt came up with a MOSFET and my sites suggest a Voltage Regulator for D8... Both in the same typical SOT-23 case. H9A is also a V Reg. in SOT-23 so maybe dual marked???