Constant charging / sync / startup sound but no display no boot

"what i would try is:-

- look on the board for any signs of damage or missing diods, check every ic, ( takes along time - but can be worthwhile)

- then if nothing, try replacing battery

- try replacing charging block

- try lcd

- put board in another fully working phone

these are the steps i would take, let me know how you get on"

"i have the same problem with an iPhone 5 black 32gb the sound when charging and if mute keep vibrate,Guess i will try the lcd change

Update

Just change the LCD for a new one and it will work again."

"Hi,

I also have the same problem with my iPhone 5.

It crashed hardly to the ground and so the backhousing deformed and the screen is destroyed.

I ordered a new backhousing and a new display, they are on the way to me.

When I actually connect my displayless iPhone 5 to the charger, it makes the charging sound about all 6 seconds. I hope rebuilding it into the new housing with a display attached to it will fix that.

Earlier (at my first display replacement) I also connected my displayless iPhone to the charger and the repeating sound wasn't repeating. It started this phenomenon after the crash, so I think the logic board has a fault on any power management section. Maybe it's not getting the needed power to charge the battery.

I will measure the voltage on the battery connector of the iPhone while it is attached to the charger to see if the input voltage is okay or not.

If the new backhousing and display won't fix it, I will reflow the logic board and tell you if I hadnsuccess or not in this thread.

Best regards,

Tolga"

I also have the same problem , black screen and wont turn on and when i plug it in i get the charging sound over and over again and vibrating over and over again if on mute. when i plug it into my computer it is recognised by itunes so its not a motherboard issue. i have been fixing iphones for over 3 years now and ive had this problem before which i solved by taking the battery out for 10 mins to drain any power that could still be left in the components and it worked fine after that. with this phone i have tried a new battery, 2 different screens so its not a battery or screen issue, i have drained the power from components and tried to boot but nothing. i have my suspicions that it could be a blown backlight fuse which pretty much means its bust but i cant see why this would happen, there must be one more thing that i could try before accepting defeat and taking it into the apple store (which is going to kill me) ??? any more suggestions would be great ?

"Hi,

I had the same issue today. My iPhone 4S had shut down because battery wad dead, and when I connected it to the power it started to beep every 6 secs or so. I connected it to the computer and I had the same issue. iTunes was able to see it, and sync some data, but then stopped. When I removed the cable the beeping was gone. The moment I connected it to the power/computer the beeping went back again. I could see however through iTunes that it was charging, whereas when connected to the power it didn't show the charging icon. What I did is reset the phone by pressing power and the apple button continuously and then letting go. I suspect that it is the cable, because it is not in a good shape at all. Nevertheless I'm still able to use it."

"Hi I may have just got lucky with mine. I would do what the other guys suggested, take it apart piece by piece and look over all the components (with magnifying glass if you have), make sure none of the tiny components are missing or any of the connections have small breaks in them. Put it back together carefully making sure every connection clip is down hard in place (they can easily come loose).

When plugging into a computer is the iPhone showing up in iTunes? if it isn't it could mean a problem with the motherboard or there could be software issues.

For me changing the battery and screen for new one's fixed the problems, but this may not be the case for everyone. It could be other things like the dock connector that needs replacing if things aren't charging / syncing with computer properly.

I also tried making every component to work (front/back cameras, vibration, speaker, microphone, wifi, bluetooth, headphone jack, volume buttons etc) just to see that they are all working and weren't contributing to the problem. If one of those aren't working it could be contributing to the phone not working properly and would need replacing."