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?
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댓글 8개
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...maybe you'll get lucky.
pollytintop 의
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 의
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 의
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 의
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 의
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