DLPA2000: PG failure

Part Number: DLPA2000
Other Parts Discussed in Thread: DLPC3433, DLP3010


I am trying to boot a custom board with the  DLPA2000 and DLPC 3433. I have no success so far. The IRQ signal from the DLPC3433 remains high, and I note that the LS_OUT of the DLPA 2000 is under 1.3v (around 1.299v). This is specified in the datasheet as a PG Failure. How could I discover the origin of the failure?. Is it only related to thermal detection or to some undervoltage? Setting up PROJ_ON/OFF again has not solved the issue.