Is there any way to salvage photos from the memory if you have to change the motherboard? I changed the battery but the phone still does not turn on. When I plug it into the USB the computer says the device malfunctioned. So it knows something is there...but not working properly

Hi Carsten, thanks for the reply. I made the repair today using this guide. Because my battery was replaced under warranty some time ago, things looked a bit different inside. The battery was installed with kapton tape, which made it very easy to remove. I found the hardest part of the process was to create a gap to begin removal of the glass back. The trickiest part was putting the battery and sensor connectors back in place. The battery is definitely charging. Fingers crossed, I haven't ruined the top sensor.

Why do you remove the battery connector before removing the back cover?