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Jeff
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Why is my iPhone not turning on? Changed lcd/display now not working!

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Hi! I bought a iphone 32gb 3gs on ebay that had a cracked lcd and glass. I replaced both with another lcd/display unit (all I had to do was detach the three cables and put the other ones back on). I attached the cables and popped it back into place but now its not turning on at all! I put the broken digitizer/glass/lcd unit in another iphone and it still worked. I also put the replacement in the other iphone 3gs and that worked as well so I know that both digitizer/glass/lcd units work (even though one has a cracked lcd and glass).

Looked in the headphone jack and it shows water damage (red/pinkish strip/indicator). Imagine that. I just don't understand how it was working perfectly/fine before and simply swapping the display unit out would make it stop working though.

Any suggestions? Already tried removing the logic board and reattached it btw.

I tried charging it with the standard wall/usb cord unit for a few hours and when I came back the phone was really warm. I've charged the other 3gs many time through my computer so I'm not sure if that's a sign of a bad battery maybe?

Jeff

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pollytintop
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look at cable 4 for the dock connector,check its seated properly and has no damage corrosion. clean where dock connects. check the battery and connectors for same. if it is water damage maybe the battery has shorted. i'd try swapping your motherboards to working iphone- if you get power then you know problem is either dock connector or battery. in which case try swapping them with the ones you know work. then order appropriate parts.

if however your motherboard doesn't work in the working iphone you will need to clean it thoroughly to get rid of greenish white bits that you see-use isopropyl alcohol 90%.leave to dry and try again.

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Coxy
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Try the Following:

Fully assembled iphone connect to computer with itunes open.

This will do two things. If phone is off it will power it to on status and itunes will /should detect it or the alternative itunes sees it straight away as it is on. Depending on phone charge this could take 15 mins.

If nothing is seen in itunes after 15 mins then i would have a look at the small clip that attaches the dock connector

Block Image

The connector near the Numonyx chip. Gently reseat the clip. I find that this clip has a tendency to spring off a little so i use a lollipop stick to apply pressure across the whole connector simultaneously.

Re assemble phone and retest with PC/iTunes combo.

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valantis sourlis
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hi,

i have the same problem I swaped the motherboeard into a working Iphone it still didnt go on. I cant spot any water damage, there are no greens or white bits. I even opend the mother moabrd and looked. all chips are there and nothing seems to be broken.

any thoughts

I've learned quite a bit about fixing iphones since I posted this almost a year ago. Turns out, when the phone got really hot, it ended up being dead (the motherboard that is) . I've come across a few of these since then that have had the same symptoms (getting hot/not turning on). Changing the battery or dock connector didn't do anything. Did your motherboard ever turn on and work properly? I had one instance where the iphone's proximity sensor (connector 3) caused the phone to not turn on. Even when I put another good one on, I had to unscrew the logic board so it wasn't touching the battery and then just screwed it back in place and used another frame w/ headphone/proximity sensor. Let me know if that works for you.

Jeff,

no i broke both my iphones when i swaped the motherbboard into the working one. now the former working iphone has only 1/2 of the screen being responsive to touch , that is the left half.i.e i cant only slide the turn on slide to the middle...i reopened and connected cable 3 again its still not working

valantis sourlis,

Did the #2 connector on the logic board break? If not the digitizer (but not the glass itself) you are trying to use might have broke. I've had ones (and cheap replacement glass/digitizers) not work properly even though there wasn't a scratch/crack on it. Cable #3 doesn't have to do with the touch screen just the (ear speaker and proximity sensor) so if it's turning on, it wouldn't have anything to do with the touch screen.. If you have two display sets (or two digitizers) see if you can get it to turn on and respond to the touch properly but only plug in #1 (the LCD) & #2 (the digitizer). See if it will turn on and if the other digitizer/glass gets it to work (if the connection on the logic board is ok). If it works fine and then you open it back up and plug in the #3 connector, then you've found the problem.

Jeff,

sorry valantis, in my other post I put no.3 instead of no.2! Jeff is correct..2 is the digitiser.

pollytintop,

so like i said the phone goes one but i cant slide it to the right 100 % to unlock it. the slide stops at in the middle. I have another frontglass but idont know if its a 3g or 3gs they look the same to me.is there a way to distinguish?

valantis sourlis,

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valantis sourlis
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i put in the new lcd now and the screen is all white now, no apple signt nothing. i bought 2 new lcd both show me a white screen when i boot up the phone , what is this now?

try hard reset.. home and power for 10 seconds, then release buttons.

pollytintop,

if the hard reset doesn't work, you may have gotten unlucky with the LCDs. White LCDs are usually a sign of a defective LCD. I have seen the logic board cause the white screen, but it was because it had water damage. Test the screens on another iphone if you have one to see if they work.

Jeff,

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elham
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I put in new lcd now and the screen is all light blue now,no apple signe nothing.what is the problem?

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