Hi me. I have an answer for your question.  According to the labels on sub-boards inside one of your power supplies they were manufactured in Thailand by Newton Power.  Unfortunately, this company does not appear to have a presence on the internet.  Investigation continues ... 
Hi all. One of my venerable PowerEdge 2400 servers is damaging power supplies.  In my efforts to isolate the problem by parts swapping with a working server I managed to wreck five power supplies before discovering that this was the problem.  I now have no more spare power supplies.  Given funding limitations I want to repair the damaged power supplies.  Where can I get manuals or schematics that will guide me through fault isolation and repair for the power supplies. Thx   
PowerEdge 2400 Power Supplies voltage drop from 5V to 1.5 V