Cable 2 is for the capacitative touch panel. Please note: You may find on some non-American Chinese, European versions of the 3G that the flip up plastic tab does not exist.
In this case you would slide the ribbon cable towards the screen until it is removed. When you assemble it, you would apply pressure to the ribbon to insert it back into the ribbon "socket. Some iPhones may have the connector colors reversed black plastic tab, white connector for connector "3". Make sure you're flipping up the tab properly, otherwise you may damage the connector.
Use a spudger to flip up the white plastic tab holding the ribbon cable "3" in place. The white tab will rotate up 90 degrees, releasing the ribbon cable. Slide the black ribbon cable out of its connector, and remove the display assembly from the iPhone.
Insert your SIM eject tool or a paper clip into the hole next to the headphone jack. If you have an iPhone 3GS, refer to the second picture and use a spudger to disconnect the ribbon cable labeled "7. Be certain that the connectors on the ribbon cables are perfectly aligned with the sockets on the mother board before applying pressure.
This may require a magnifying glass or jewelers' loupe. Five 2. Two 2. One 2. The screw that goes next to the camera bottom right orange highlighted screw also has a metal strip that holds the camera in place. Remember to put this strip back in place before you insert the 2. Use a spudger to gently pry the camera up and out of its housing in the rear case.
The camera cannot be removed entirely yet because it's connected to the bottom of the logic board. Use a spudger to gently pry up the end of the logic board closest to the dock connector. There is a small golden grounding tab on logic board adjacent to the 'do not remove sticker'. Be VERY careful this does not snag on the side of the case when prying up the logic board; it breaks easily. If you have signal problems after removing the logic board, check this ground tab. If the board won't lift up, double check to make sure all the screws securing the logic board have been removed.
When replacing the logic board after installing battery, connect the camera to the logic board before inserting it into the case. Then make sure to set the top section of the logic board where the SIM tray is in place before settling the rest of the board in place.
This is important, as sometimes the SIM card slot will not align into place. Once the top section is in place, the bottom section can be maneuvered into place. You will know the logic board is correctly installed when the SIM tray is aligned with the opening in the iPhone case and the camera module seats neatly into its place. Use a spudger to pry the battery up from the rear case. The battery is attached with an adhesive strip around the perimeter of the battery. To prevent the battery from bending during the removal process, we recommend against using just the plastic pull-tab.
It merely gives you more space for removing the headphone assembly which is also unnecessary to completely remove. The iPhone's battery is attached to the rear case with a mild adhesive. This adhesive usually comes out attached to the battery. If your replacement battery already includes an adhesive backing, you're all set. If your replacement battery doesn't have an adhesive backing, you'll want to transfer the adhesive from your old battery to the new one.
I'm not surprised your battery doesn't last very long. Honestly, I'd just recycle it and buy something new. Or at least newer. The resale value of a 3gs is less than the price of even a cheap 3rd party battery at this point.
Oct 7, PM. Thank you so much Kilted Tim for your response to my question. I am planning on going to recycle the phone sometime in January next year. I can't afford the newer iPhones because they are too expensive. Hopefully, I will try the iPhone again in a couple of years.
Oct 10, PM. Only you can decide whether it is worth replacing the battery. The iPhone would of course still be perfectly usable for calls, text messages and many other things. However, a number of applications do already or may soon require a newer iOS version, not supported for the 3GS. Oct 11, AM. Thank you Jan for replying to my question, unfortunately I am not going to replace the battery. This post is for the Apple folks out there who still own an iPhone 3GS or 3G device that has a battery that doesn't last.
If your battery lasts for 10 minutes or so, and you are considering having it replaced, check out what I discovered before you push on. I was contacted by a friend of mine one month ago. Her son had an iPhone 3GS in near-perfect condition, but with a battery that would not accept a charge.
I immediately agreed that she needed to have the battery replaced. We ordered a replacement iPhone 3GS battery from Amazon. Taking out the old battery was no easy task. It involves gutting the entire iPhone, and forcibly un-gluing the old battery from the inside of the case. I successfully installed the new battery, through much travail, replaced the components and put the case back together.
I booted on the phone to a near-full charge, and called it a day.
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