Fifth generation of iPhone. Repair of this device is straightforward, and requires screwdrivers, prying tools, and patience. GSM/CDMA / 16, 32, or 64 GB / Black or White.

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After replacing the power cable screen flickers, but only during calls

I followed the guide to replace the power/sensor cable and everything apart for one minor detail seems to be fine now.

In the process the only other thing I did was to replace the battery.

The outcome is a fully functional iPhone 4S (tested cameras, WiFi, mobile telephony as well as internet). But whenever a call is received or placed, the screen which shows, among other things, the button to hang up, to enable loudspeakers etc, flickers.

The flickering only happens during calls (no matter whether incoming or outgoing).

What gives? Can anyone point out a specific reason why this would happen (and of course a remedy)?

For now I am considering this more of a cosmetic issue. During a call it rarely matters if the screen flickers (except when using the dial pad to enter further digits during a hotline call).

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The proximity sensor is on the power button ribbon cable assembly. Either that is not mounted properly or is faulty.

I have marked it in red here:

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And that sensor, if defective, could cause the symptoms?

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Usually they don't work at all when faulty.

It's either blocked by something or not mounted properly

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Thank you! I'll see if I can make out any blockage and perhaps order a replacement if I can't.

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