Quoted from Smbel92:some of the pins on the connector do give out 5v but the 5v led isn’t coming on
Measure +5v using the ground wire in the PBDB connector. If you get no reading, but 5v is good if you use another ground, the ground wire is the likely problem then. Ground mods done? Without looking at the wiring diagram the PBDB ground return probably terminates on the ground block in the cabinet.