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Revamped version of the iPhone 3G with faster processing speeds. Repair of this device is similar to the 3G, and requires simple screwdrivers and prying tools. Model A1303 / 16 or 32 GB capacity / black or white plastic back.

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New LCD Installed, Now can't hear callers?

Hello. Have an iPhone 3Gs that had a cracked glass and a few dead pixels on the LCD but everything still worked (calling, hearing callers, sound, etc.). I purchased the front display kit that included the LCD and glass already together to simplify the install. After installation, everything on the phone works fine except the proximity sensor (I think). When I make a call, the caller can hear me but I can not hear them. Also, when placing the phone to my face, the screen does not dim and lock. I've read on here that cable #3 may not be seated correctly. Is there a trick to getting this cable in securly? After inserting the cable as far as I think it will go, I press down on the white tab which seems to secure it. However, I'm not sure the ribbon cable is seated deeply enough as it took several gentle attempts to just get it seated to where the white tab would catch it. So how can I verify that the issue is with the #3 ribbon cable and how can I be certain that I'm getting it seated deeply enough under the white tab area? As mentioned, did not have any hearing issues prior to replacing the entire LCD/front display assembly so that leads me to believe that it's not an issue with the board or any other component and the connection where the white tab is on the board looks fine. Please help.

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This problem is most likely due to faulty Flex Cable #3, which is somewhat common. This is the fault of the seller of the whole assembly.

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Attaching the #3 cable on either the 3g or 3gs is a tricky thing.. many times leading to no ear piece sound. One solution I heard (but still haven't had luck with ) is to readjust the cable several times in slightly different positions before clamping down the retainer clip. As you can see, the contact points on the #3 ribbon cable are very small and they need to line up just right with the connector pins to work. Replacing the whole proximity sensor cable is an option but it doesn't always solve this problem. I have two 3g's that I have to use in "speaker phone" mode to work, but the strange thing is, I can hear through the earpiece at the same time! If you can't get it to work (ear piece speaker) just do the speaker phone trick.

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