Troubleshot IPad won’t start up giving bong noise and when iPhone power on no display beep alert every 2 to 5 second or alert sound for specific time interval.
Various reasons for iPhone won’t startup blank screen and steps for repairing iPhone stop working non responsive LCD.
In brief there are few reasons which can cause iPhone stop working. Those are iPhone power failure like battery, power port, iPad LCD display screen problem, software or iOS firmware problem and proximity sensor. But first go through my post for apple ipod / iphone won’t turn on and black screen troubleshooting. Then you have much better idea how to resolve this problem.
1. When you turn on iPhone and screen remain black and giving bong noise. It indicates that some initial required hardware is failed and it gives system sound alert.
For example if you remove computer ram from its slot and start computer. It gives beep noise while booting. And there is no display only black screen. This is called booting hardware failure. Similarly for apple iPhone require some basic hardware to boot. If any needy hardware fails, than it gives beep alert sound.
2. Sometime iPhone digitizer not working and it also gives bong noise alert. And iPhone would not turn on and remain black screen.
3. IPhone LCD is not working, it gives bong noise. It is not damaged display LCD which cause such bong beep noise. But actually the soldering connectors are teared off or dry soldering cause such problem. If you are a professional hardware expert than check on back side of iPad logic board. You can judge that soldering is proper or not. Don’t try yourself.
4. Sometime it happens that iPhone turn on when you use charging cable, but iPhone won’t turn on with battery. Here also check battery's 3 connector point soldering whether it is proper or not. Or to confirm that whether problem with battery or connector. Use another iPhone battery and turn on. If iPhone boots, then there is a problem with battery. But even with new battery problem remain same. Than its better to check iPhone battery connector point.
5. Sometime iPhone display LCD connector got damaged during inserting display cable to PCB slot. It results in iPhone non-responsive LCD screen.
6. Sometime you upgrade iPhone firmware to latest version. And you bought older LCD screen and installed it. It also results in iPhone won’t start up no display. So replace with compatible LCD display.
7. To exactly identify the problem, use crash log of iPhone. Whenever you synchronize iPad to iTunes, the log file will be transferred to iTunes. To find log file in windows computer.
Type %appdata% in run command – this will open a folder – click on apple computer folder – logs folder - crash reporters folder. Inside crash reporter folder there is a separate folder for each apple devices.
Windows 10 and windows 7 :
Find crash log on windows 10 computer. Type eventvwr on run command. This will open even viewer box and hen application. On right side of panel there are list of application log. You can find iPhone crash log there.
Those crash logs are very difficult to understand. So use XCODE or any other crash reporter tool. This will convert crash log to human understandable names and organize crash log. Which is very useful for iPhone troubleshooting. In this crash reporter view, if you find defunctScreen. Then it says that there is iPhone LCD screen display attached. It means LCD screen is not working. As iPhone boots, it does not detect LCD screen. Because of that iPhone start with blank screen.
8. Your proximity sensor wrong working can make iPhone screen blank. That can cause continuous beeping.
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