Timeline for Shield wire in Micro USB extension lead appears to be ground
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| Apr 21, 2019 at 11:03 | comment | added | Jasen Слава Україні | test the cable with a USB socket, perhaps you have one in your junk box. testing on a device that may have negative and shield shorted together will not tell you where the black wire goes. | |
| Apr 21, 2019 at 7:30 | comment | added | user57037 | As far as USB jacks go, the shell (shield) is usually grounded in some fashion. Maybe through a ferrite or something. So using the shield as GND might work much of the time, but it might not work totally reliably, and it might not work on all systems. | |
| Apr 21, 2019 at 7:27 | answer | added | PLASMA chicken | timeline score: 1 | |
| Apr 21, 2019 at 7:26 | comment | added | QWERTYUIOPYOZO | Yes, I consistently got 0 volts between red and black, hence my reason for finding an alternative connection. I also bought a spare cable as a back up, although I doubt I will see different results given it is the same product. Any thoughts? | |
| Apr 21, 2019 at 6:51 | comment | added | user57037 | I will mention that sometimes it can be kind of hard to hold the wires against the probes like you are doing in this picture. You have to try repeatedly before you can be sure that it really doesn't have 5V. Or use some type of clips to grab the wire ends more reliably. But it sounds like you have measured several times, so I assume that 5V really is not present. | |
| Apr 21, 2019 at 6:46 | comment | added | QWERTYUIOPYOZO | Hey mkeith, thanks for your quick reply. That's also what I thought, but since I have no experience with USB wiring, I thought it would be good to ask. | |
| Apr 21, 2019 at 6:41 | comment | added | user57037 | Sounds to me like the cable is defective. Might not ruin anything, but it is not supposed to be that way for sure. You should have 5V across red to black. | |
| Apr 21, 2019 at 6:40 | review | First posts | |||
| Apr 21, 2019 at 7:20 | |||||
| Apr 21, 2019 at 6:39 | history | asked | QWERTYUIOPYOZO | CC BY-SA 4.0 |