Hello,



I'm unsure, I already sent one J-Link back as the 5V Supply seems dead, it does not supply 5V.



I try to power an STM32F4 Discovery with it and double-double-checked the wiring already.



I expected that there would be 5V available when I plug in the J-Link (measured between pin 4 and pin 19).



I don't think the wiring is incorrect as when I externally power the Discovery board I can read a valid VTref on pin 1:



SEGGER J-Link Commander V6.10c (Compiled Sep 28 2016 18:30:32)

DLL version V6.10c, compiled Sep 28 2016 18:30:23



Connecting to J-Link via USB...O.K.

Firmware: J-Link V9 compiled Sep 1 2016 18:29:50

Hardware version: V9.40

S/N: 269402916

License(s): FlashBP, GDB

OEM: SEGGER-EDU

VTref = 2.958V





Type "connect" to establish a target connection, '?' for help



On the other hand, I can't connect to the device, I still need to clarify this.



I use J-Link on Linux, not sure if this may be related to the issue.





Can anybody explain if my understanding is incorrect?





Thanks for any hints,

Torsten

Thanks for your hint, now the power is on. I have read the manuals before thoroughly but missed that point.

Thanks,
Torsten