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The second generation HTC One—dubbed the HTC One (M8)—features a dual flash and the new Sense 6 UI, and was released March 25, 2014.

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Proximity Sensor failure after battery replacement

I just replaced the battery using instructions on this site and everything seems to be working except the Light/Proximity Sensor (the thing that turns the screen off when you hold the phone up to your face). Before I try tearing it down again, has anyone had any luck fixing this? I tried running the Light Sensor test (*#*#3424#*#*) and it registered a constant 4070 Lux. Not sure what that means. I'm wondering if one of the little cables that went to the upper left of the camera didn't get connected right.

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Constant LUX means it is not detecting the light difference on the light being shined on the ambient light sensor.

There should be a proximity sensor test there in the test menu.

Also for battery replacement taking out the daughter board should not be required anyway it's most likely a connection issue to the proximity sensor which is plugged into the daughter board.

Or it could just be glue blocking the proximity sensor near the plastic speaker mesh cover.

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if it is reading a constant lux other than 0, it usually means it is disconnected. i would start by reopening the device, and making sure every flex is connected properly.

That being said, to an electronic device, disconnected, and not returning a signal are the same thing. a component the flex could very well have blown depending on ESD, shorts, or physical damage.

There is also a potential that there is just an obstruction in the lens of the sensor.

hope this helps

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