Chosen Solution
I just replaced my HTC One M8’s battery and charging port. When I put the phone back together the screen remains blank. I can feel the device responding to touch but the backlight does not function now. I disabled the phone 2 more times thinking I had missed a connection but without good luck. The bad luck came on the 3rd attempt,, when I reconnected the battery lead to the battery the phone vibrates, constantly. I assume now there’s a short in that circuit. Any ideas?
Did you turn the phone off before disconnecting the battery? Did you disconnect anything else before disconnecting the battery? On some phones, disconnecting the LCD before disconnecting the battery burns a backlight filter or two, or even other components related to the LCD.
