Re: Repairing YM-3591AAR power supply (HP P/N 81-00000051)

: Unfortunately, I can't tell you what is wrong with your PSU without looking at it. But the Excel table I've attached to my first post lists many other problems and their possible sources (faulty components). Try to check them. Also, the resistors in "my" PSUs cracked because of white putty that was covering them. You may try to remove it from the entire board and check all components underneath it.

As far as I can tell, there is no publicly available documentation of what the other pins on the main connector do.