iPhone 5s Logo flashes then black backlit screen
Ok so I have this iPhone 5s that was sitting around for a while. I charged it up and it powered on just fine. I was hoping to get some photos off the phone. It was charged up to full, then I left it around hoping to get to transferring the files but got distracted so it ran out of battery, the next thing I knew it would not boot. When I press the power button the logo flashes for about half a second then it goes to a black backlit screen. I feel like I have tried just about everything. I had another 5s around and I switched the logic boards in them, same issue. I have tried a few of those recovery software programs that promise to not lose data through updating to no avail. It boots straight into recovery mode and is still recognised by iTunes but I haven't tried to restore yet as I was hoping to keep the data but I have assumed that this must have been a hardware issue. I know it may be wrong to assume that if I haven't tried restoring but I don't understand what could have caused this. As I said it was fine one minute and the next it just wont boot. I suppose my questions are, are there any data recovery options that could actually preserve the data? I have heard of 'professional data recovery services', does anyone have experience with these? Or should I try heating the A7 or NAND chips? Also one more thing I may mention, I believe I have read that you should still be able to power on the device with the battery disconnected while it is plugged in, is this true? Because I tried this and it will not power on. Perhaps there is a short somewhere?
Is this a good question?