MBP late 2011 connect to thunderbolt display always failure

Hello, EggManQQQ.

Thank you for visiting Apple Support Communities.

I understand you are experiencing issues with your Thunderbolt Display. I would need more information on the exact issue that you are experiencing to provided a better answer. However, here are the best two troubleshooting articles to go through for issues with external displays.

Get help with video issues on external displays connected to your Mac

OS X El Capitan: If a Thunderbolt device isn’t working

Cheers

make sure you install the thunderbolt updaters if required. Go to Applesupport downloads and do a search.