@noob99 that will depend on how it is setup on the inside of your headphones. Sleeve should be ground not 5V. For the $2USD I would go ahead and buy a new one from places [https://www.ebay.com/itm/New-USB-Charger-Power-Cable-Lead-For-JBL-Synchros-E40BT-E50BT-Headphone-J56BT-/282556064794?_trksid=p2349526.m4383.l4275.c10#viTabs_0|like this] That way you know that the connections are right.
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@noob99 that will depend on how it is setup on the inside of your headphones. It is very conceivable that the wiring is identical to the one you listed https://www.ifixit.com/Answers/View/83817/usb+cable+to+head+phone+jack+.Is+it+possiable+to+make+work For the $2USD I would go ahead and buy a new one from places [https://www.ebay.com/itm/New-USB-Charger-Power-Cable-Lead-For-JBL-Synchros-E40BT-E50BT-Headphone-J56BT-/282556064794?_trksid=p2349526.m4383.l4275.c10#viTabs_0|like this] That way you know that the connections are right.
@noob99 that will depend on how it is setup on the inside of your headphones. Sleeve should be ground not 5V. For the $2USD I would go ahead and buy a new one from places [https://www.ebay.com/itm/New-USB-Charger-Power-Cable-Lead-For-JBL-Synchros-E40BT-E50BT-Headphone-J56BT-/282556064794?_trksid=p2349526.m4383.l4275.c10#viTabs_0|like this] That way you know that the connections are right.