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LDC1612EVM: LDC1612EVM is not sensed by computer USB port.

Part Number: LDC1612EVM
Other Parts Discussed in Thread: LDC1612

I am using LDC1612EVM board rev B. Once I upgraded wrong firmware, it stopped working. Got solution from Ti Technical support. As per advise, shorted PUR and VUSB pins (R6 and C29). Board was detected, but suddenly disappeared from the windows 7 Device manager. Now my PC is not sensing the board. I changed USB port on laptop. Changed the laptop and USB cable also. It remains undetected by computer. Case Number:  CS0844465 referred to Ti Technical support. I am advised to post same in E2E.