We had 2 x WPJ344-LVs lying around and I recently bought 11 more for a project; we were having a real tough time with USB and mini-PCIe (both OpenWrt and LEDE) and I simply could not figure why.
Eventually we got to testing the voltage levels of the two pertinent rails, only to find that they were quite low:
+5VDC rail was measuring about +3.3VDC (interesting)
+3.3VDC rail was measuring about +2.5VDC
We tried two different +24VDC power supplies and 1 +12VDC power supply (all with the ability to provide enough current) and the results were the same.
We confirmed that we could get USB working by pulling up the +5VDC rail towards 5V manually with a reliable +5VDC source, we didn't try with mini-PCIe though (didn't wanna blow up our expensive LTE cards).
Interestingly, this issue was in play with our older boards and our newer boards.
All boards were bought from 524wifi.com
Has anyone seen an issue such as this?
One of new board serials is 104030475, one of the old board serials is 103232568.