We have an issue with possible 160W picoPSU-s and Biostar TB250-BTC motherboard compatibility... and we are looking for some help.

We have set up hundreds of rigs with the following set up:

Biostar TB250-BTC
HP 1200W server PSU
Breakout Board 12 PCIE
PCIE to pigtail connectior (to connect to picopsu)
160W picoPSU
various vga cards

We just had an issue with a recent shipment of over 150 pieces of 160W picoPSU-s. 

The first box of 50 worked like a charm, all mining rigs were working fine.  Then when we started trying the second two boxes of 50 picoPSUs none of them were able to power up the motherboard and CPU.  The CPU spun up briefly, never stayed on.

We tried all variations on changing different parts of the rigs, but came to the conclusion that it had to be the picoPSUs.  When changing the picoPSU on functioning rigs with the ones from the last two boxes the rigs also did not turn on.

We even had the picoPSU sent to the lab where we checked them.  They passed the lab tests and seem to have the performance they are advertised at.

So we are a bit clueless... Thought maybe someone could give us some guidance.  Read somewhere about possibly soldering the picoPSU to add more resistance to it... Any ideas are welcome.

Thanks,

Psyience