And then, if your front camera and light sensor work well? The earpiece speaker works by connecting with two metal contactors on the front camera flex cable. If the camera and the light sensor all failed, that's either the problem of flex or front camera FPC connector.
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As for you have replaced with entire display and still not working, so it's more likely the problem of FPC connector. To check if all the pins of FPC connector are well.
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As for you have replaced with entire display and still not working, so it's more likely the problem of FPC connector or motherboard. To check if all the pins of FPC connector are well.
First, check if you did some weird setting.
And then, if your front camera and light sensor work well? The earpiece speaker works by connecting with two metal contactors on the front camera flex cable. If the camera and the light sensor all failed, that's either the problem of flex or front camera FPC connector.
As for you have replaced with entire display and still not working, so it's more likely the problem of FPC connector. To check if all the pins of FPC connector are well.