Hi All!
Sorry for replying on a old thread, but just FYI:
There are different versions out there for the game card reader. The issue you are describing is because you probably have the wrong (version) game card reader installed.
For more info, please visit: [link|https://gbatemp.net/threads/touch-screen-stopped-working-after-replacing-the-digitizer.616793/|Touch screen stopped working after replacing the digitizer|new_window=true]