

What is going wrong here?
I am trying to install a Funnyplaying LED backlight kit to work and I am most of the way there but the A, B, and Brightness button aren’t working. I feel like my soldering was good but which of these joints is causing the failure?
I don’t want to touch it too much to troubleshoot out of fear of making it worse. If I need to send more pictures I will, any advice is appreciated.