I too have an LCD bruising concern when pressing on the front glass towards the top of the unit. I disassembled and cleaned all parts twice for quality control. During reassembly I paid close attention to the concern area. Still noticing some slight bruising on the LCD after reassembly.
During my initial teardown I noticed that the individual I purchased the damaged iPhone from had been nosing around the guts, ergo: missing and loose screws etc. I also noticed that this person tried prying the front display and bezel away from the midframe using what ever they could find -- most likely a small screw driver.
- It's possible the previous owner slightly warped the midframe assembly during their attempt to separate the front display and bezel from the midframe.
Conclusion: in my particular case the LCD bruising is being caused by air gaps between the front display bezel and the midframe -- because the gap tolerance is almost infinitesimal and there is no visible obstructions preventing the front display bezel from seating flush to the midframe -- adhesive will most likely correct the concern
For everyone else experiencing an LCD bruising concern.
- Always prior to reassembly clean and inspect your parts.
- As stated above make sure there is no debris stuck or gummed up where the front display bezel and midframe meet.
- Use Rubbing alcohol 70% "it's in your medicine cabinet" and a foam Q-tip -- not cotton to clean and degrease with.
Side Note: In the iPhone 4 repair guide it calls out using Windex to clean and degrease wi-fi antenna components and other parts, . . . don't use Windex because there are additives that could leave behind a potential film or residue in certain ares. Rubbing alcohol evaporates on contact and is all one needs to clean and/or sterilize conductivity "metal to metal" components.
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I'm having a very similar issue. I replaced my iPhone 4's LCD/front panel earlier this evening, because the original one cracked.
After installing the new display and re-assembling the phone, I noticed that the home-button felt a bit more sunken in, than before (my guess, by as much as a millimeter).
So I took the phone apart once again, to check whether I had not fully pressed the new display into place, before tightening the screws. But everything looked like it was as far in as it could go. So I again re-assembled the device, to no avail. It almost feels like the glass itself is thicker or something...
Is there a way to fix this, or perhaps place something under the home button to slightly raise it? My concern is that over time, the moisture from fingers and general use, would seep in through a gap (if there is any), when the button is pressed down.
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