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TPS74701: Debugging issues.

Part Number: TPS74701


My client is currently having issues with the part number specified above.


Two constant test failure on current 2071 assembly. 39 failures of each so far out of 270 boards tested out of lot a of 475 boards.  Would like to send 10 of each to "x" for evaluation.

Reset/power up test -  Power rails all or partial notcoming up.

SN 2071-010702,010622,010667,01074,010730,10715,010761,010767,010756,010739


PDDX3Mem Test -  Test hangs/reboots then hangs at login prompt during PDDX3Mem Test.

SN 2071-01737,010723,01734,01721,010685,01728,01713,010725,010722,010719


I have determined that bad LDOs are the cause of both issues. There are multiple date codes on these parts (per blade and across blades).


I was able to replace U37 on a blade that failed PDDX3Mem Test and it passes test now (2071-010723). Also, I replaced U35 and U27 on one of the blades failing to fully power up and it successfully passes test now (2071-010739). The other boards are available for pickup for rework and re-test.

 The part markings had the same first 2 lines and only differed on the last line. This line is provided below for reference to see if there is a trend of failures with certain date codes.

Good: D2J1, D3CK, DCFV, ASD8, APK1, D4NS

Bad: D1C4, D2JF, C05N

Any assistance would be greatly appreciated.