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pixxelpush
11
Asked
Constant charging / sync / startup sound but no display no boot
Hi, I've purchased a iPhone 4S off ebay with the aim of fixing it. It is in great condition inside and out, however won't turn on or boot and there is no display. When plugged into the wall socket it just makes the charging chirp sound over and over again, but that is all. When plugged into a computer it does nothing, no show in iTunes. All the seller was able to say was that he tried to fix the screen and it worked before that, but couldn't get it to work properly after that. Any ideas what could be wrong, what needs to be replaced? If it was just a faulty screen shouldn't the phone still charge and why is it making the constant sound?
Edited by: pixxelpusher ( )
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Krayzee
107
Answered
Accepted Answer
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
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linda
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Answered
hi i need some help, i have replaced the screen on my iphone 3gs with the wrong screen but it vibrated when flicking the loud to silent button, i then reordered the correct screen and fitted it and because it had been off for five days i assumed the battery was completely dead. i put it on charge for 2 hours but when i came back to it and tried turning it on nothing happened, i held down the power and home button for 20 seconds and the battery came up on screen saying it was charging and had about 10 percent battery, i left it on charge for a further 4 hours and came back to it but it still wouldnt turn on so again i held down the power and home buttons and it showed the battery again charging but with no change to the power, what should i do??
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Tim
1
Answered
Thanks for those informations pixxelpusher. I have the same problem at the moment. A new battery is on the the way to me. The new LCD is already assembled. I hope the battery is the reason. I get exactly the same mistkaes which you got. No display, the repeating start sound and so on. Let's wait, i will update my answer as soon as possible.
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Tim
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Answered
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pixxelpush
11
Answered
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.
I'd redo the entire job...ie dismantle and then reassemble, this way you know you've got everything connected properly..at the same time you're checking out the board and ribbons as krayzee says. Sometimes people aren't so good at reassembling...
pollytintop,
Thanks Krayzee & pollytintop for the suggestions. I did do a complete strip down when I first got it just to make sure all the components were there, they are and they looked like they are in as new condition, i also cleaned all metal connectors. However, I didn't really inspect the components extremely close, so I might go over it all again with a magnifying glass to check. How do I check IC? aren't these under the heat shield protectors? Is it safe to remove those? Also is it possible to check the battery with a multimeter? would it be the outer contact on each end of the connector? I have purchased a new battery and lcd screen off ebay so will see if they help diagnose the problem. If not I will look into replacing the charging block as well. For testing parts in another phone it would have to be another 4S right? That could be hard to come by as I can't really afford to fork out for another one.
pixxelpusher,
Also, any ideas why it's making the sound over and over again? Seems like very odd behaviour to me even if the screen is dead. Also, found out that when the silent mode button is toggled it then vibrates intermittently but constantly.
pixxelpusher,
Ok just a quick update on this. I've tested the original battery with a multimeter (by testing the outer 2 metal points on the clip) and even after sitting on charge for an hour it still displays as no charge so I figured out it must be dead. I've recieved a new battery that i've put in the phone and now it show's up in iTunes!! So it looks as if the phone's internals are working (well I figure the motherboard and usb dock connector must be ok at least). However, there is still no display on screen and it still makes the constant sound. So I'm waiting for a new lcd screen to come in the post and will see if that fixes the display (which I think must be dead as well). I will update once it arrives.
pixxelpusher,
Another update, I've now recieved the new lcd screen and carefully replaced. It is now working! I can see the display and interact with the phone. Also, putting in the new display has stopped the constant sound when charging, so it seems as if the phone is now fixed. I'll keep it under observation for now but as far as I can see everything is working as it should be; calls, wifi, speaker, headphones, all buttons, all cameras, charging battery. So it looks like for me all it needed was a replacement battery and lcd display, and it was replacing the faulty screen that stopped the constant sound when on charge or usb. Hopefully this can help out anyone else in a similar situation.
pixxelpusher,