When I turn on my iPhone 4S the apple logo pops up for a split second then the screen goes black but the phone itselfs boots up just fine???

Question

I tried replacing the screen with no luck. The same thing happened with the new screen. I replaced the backlight coil and the backlight ic and still have the issue. I don't know what else could be the problem. If the battery is completely dead and I plug it in the "charging battery" symbol shows just fine during the entire time it is charging, but as soon as it starts to boot up the apple logo shows for a split second then the screen goes black. The rest of the phone still boots up just fine. I can use SIRI, press the lock button like I'm about to use my phone and slide my thumb across where the "slide to unlock" would normally be and it will make the unlock noise just no picture display. I am pretty tech savvy when it comes to repairs and all of the connections look fine, replaced backlight coil and ic, replaced LCD/digitizer, tried a restore, tried a DFU restore, multiple hard resets, but I am at a loss as to where to go from here. I had dropped the phone and put a minor crack in the screen but the phone worked just fine for a couple months after before this started to happen. The phone is still under apple warranty but apple won't cover it because Apple is stating that it is "caused by the crack in the screen." But being a repair technician I know that is not the case... Good one apple. So I took it upon myself to try to determine the REAL problem. Anyone with a little more knowledge have any ideas? Any suggestions are appreciated!!

Answer 1

Yes, I understand that. But The screen issue is not a result of user damage. The phone was not dropped when the screen got cracked. My daughter was standing in a chair at the table and dropped one of her toys onto the bottom of the phone and cracked it right by the home button. (Nowhere near the LCD/digitizer flex cables, connections, or logic board components) then a few months later my phone had died, I plugged it in, it showed it was charging, then Apple logo disappeared and screen didn't work. AFTER contacting Apple about the issue and them telling me that it "is a result of the very minimal crack to the sheet of glass that has no relation to the LCD or Digitizer and that the warranty does not cover it I had taken it upon myself to change the LCD/digitizer to no avail, as well as backlight ic and backlight coil to no avail. But how do I go about letting Apple know that it is in fact NOT due to the cracked screen nor is it due to the flex cable connections? I can't. So the lady that works the call center phones  trying to "convince" me that she knows what she is talking about and "convince" me that it is from the cracked screen I have to take her word because I can't show Apple that its not because of that without paying them $199 to fix the screen in which case they will just send me a new phone rather than fix the faulty hardware under warranty.