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I recently purchased the lcd display screen+touch digitizer assembly and I had the assembly installed on my phone and turns out the sensor on the screen does not work. when I answer a phone call the screens turns off after awhile and never turns back on after trying to hang up. The gentleman who put it on for me said the screen is defective.Does somebody know why?I need help badly. Thanks.
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I just got done working on my SGS4. While I was in there I noticed that the proximity sensor (the one that detects when your face is close to it) is attached by a flex cable. If you possess the tools, I would take it apart and make sure that the flex cable is firmly attached. Also, I have had screen protectors trick the sensor into thinking that my face is against it. If you have a screen protector that covers the sensor, remove it and try again.
This link will show you how to access the secret menu in the SGS3 that allows you to use diagnostic tools. http://www.androidcentral.com/how-uncove...
Also, the flex cable I am talking about, at least in my s4 is attached to the motherboard.
Good luck!
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