Someone please help! I replaced the display assembly… And, now the brightness/dimmer button and the keyboard light buttons do not work. What did I do wrong? Any particular cables I should we reseat? It’s strange because the rest of the keyboard works fine and the brightness/dimmer buttons register on the screen when I click them but the screen only becomes more pale/lighter in color saturation but not brightness. The keyboard light buttons don’t register and show a square box with a line through it. Not sure what I did wrong .. Would appreciate any advice, please!

Is this the connector for the earpiece, as well? I did the screen replacement and everything worked, except now I can’t use my earpiece… I’m afraid I didn’t fully connect this particular portion.

After I replace the battery, should I put on the iPhone 7 Display Assembly Adhesive and then follow the steps in that guide to reassemble?

Sorry, I’m so unclear about when to replace the Adhesive tape. Should I put the iPhone 7 Display Assembly Adhesive at this step, or after I’ve replaced the battery?