I am a full time mobile phone/ laptop engineer, based in a repair shop in the south of England. I mainly specialize in Apple software & hardware but have a wide variety of knowledge and experience on all mobile devices.
Was there any specific event that caused the phone to malfunction? more information may help determine the cause. A quick idea, IOS7 causes a major bug that causes iphones 4/4s to appear completely dead, try plugging the phone in at the mains and holding the power and hoe buttons for up to a minute and see if you get any response. Regards Tiny
Hi, the easiest way you will be able to test LCD's is by picking up a tester flex like the one linked below. http://www.ebay.co.uk/itm/New-LCD-Digitizer-Touch-Screen-Test-Tester-Extended-Flex-Ribbon-For-iPhone-4-4S-/190879311089?pt=UK_Replacement_Parts_To... If you only need to test a single LCD you can attach the flexes to the motherboard without having to fully dismantle the device, make sure you put a little bit of electrical tape on the old flexes to prevent any shorting. Regards Tiny
Sounds like a software issue, because of your home button issue it is going to be a little awkward to re-flash the device. Use the following program to force the device into recovery mode, http://jaxov.com/2010/05/recboot-iphone-recovery-mode/ You should then be able to re-format the device through itunes. Hope this helps, let me know if you need and further assistance :P
Sounds like this could be caused by a few different things. 1. Software, IOS is awful at calibration, even after a week or 2 problems can arise that weren't there to begin with. Try reseting the device by holding both power and home buttons until the screen has gone black and the apple logo has appeared. Backing up and re installing IOS may help resolve this issue as well. 2. Shorting, any ESD (Electro Static Discharge) can cause the digitizer in the screen to act strangely i.e. ghost clicks and unresponsiveness. Open the device and check that no screws are out of place, also check the flexes for any damage. 3. Faulty Hardware, the part that you have been supplied may be defective. If none of steps 1,2 help contact the supplier of your screen and get them to swap a new screen with the faulty one you have been given. Hope this helps :P
Error 16 usually points towards a hardware/ cable issue, try using a different data cable, or leave the phone plugged into the PC for a hour or 2 then try again. If all else fails take it to a repair shop so they can test internal components. Same happened to me and it turned out to be the lock button flex causing a short. Good Luck :P