I repaired my dock connector on my iPhone 4S but it won't charge

Hello. I recently purchased and replaced a dock connector for my iPhone 4S that had a broken power button and dock connector. However, when plugging the phone in, I get nothing on the screen (when using my wall charger, portable charger or back of PC) and nothing in iTunes - on the PC I do not hear a device connection sound. When using the front USB ports I get a "Device Descriptor request failed" but I do hear the device connect sound. What could be the issue?

Small edit: the phone hadn't been switched on for around two years because the dock connector had broken