No data connetion after replacing usb port

Hi!

I've replaced IO assembly following this guide: Nexus 7 I/O Assembly Cable Replacement a few months later I discovered that device only charges through USB, but is not transferring any data (doesn't see mass storage over OTG cable; when connecting to computer windows is not recognizing that a new device was connected and after that adb apparently can't see it).

I guess I screwed up something during repair, but would anyone be able to guess what should I try to re-repair now?

Cheers!

PS I used this one for replacement: http://www.aliexpress.com/snapshot/65368...