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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 / 8, 16 or 32 GB capacity / black or white plastic back.

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iPhone wont lock screen while making call

Hi

I had a busted iphone 3GS display and I followed the great guide on ifixit.

Now the iphone is working great expect for one important thing.

When I make a call, the display wont “lock”, So when I put the Iphone up to my ear, my cheek touches the iphone activating the speaker or punching numbers.

I guess that the iphone should have a sensor, that detects the position when a call is made, and putting the display in a locked mode.

How can I fix this?

Thank you very much.

Best regards

Dennis

Answered! View the answer I have this problem too

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It is definitely the #3 ribbon. If reseating doesnt work, then replace. Careful not to damage the connector. The ribbons are pretty fragile to bends and kinks. Avoid this.

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thank you. I am going to try that. I must have damaged the connector. Will let you know. Have a niec day.

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Dennis if you damaged the connector let me know, I replace them all the time.

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Hi Hector. Great news. I replaced the #3 ribbon and now the phone is working fine! Thanks a lot! have a nice day.

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Awesome Dennis!

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You may Need to change ur proximity and light sensor the one u bought may have been defected.

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try reseating connector no.3 or cleaning the flex and connection first before replacing it.

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What about in a Iphone 4? I have Same issue.

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this question is 2 years old. I recommend that you ask your own question and give as much detail as possible. "Me too" does not work unless you tell us what you did, what happened and what you have tried. Use this link to get to the question section. http://www.ifixit.com/Answers/Ask/

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Dennis will be eternally grateful.
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