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AMC7836EVM: AMC7836 EVM ,SDM-USB-DIG module is not litting

Part Number: AMC7836EVM

I am using AMC7836EVM evaluation board... I made the connections as per the user guide... and the updated the driver.. and is showing TI MSP430 USB (COM3). However, the LED  (D2 corresponds to VDUT) in SDM-USB-DIG module is not litting ,so because of VDUT ,its not powering up the LDO section of 12 and 5v. 

what will be the problem.. could you please suggest ?

Thanks