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How do you fix the iPhone 7 ghost touch issue after screen replacement

After replacing a screen for iPhone 7, I countered an issue that the screen has a ghost touch then I tried to check whether the connector is good, clean the connector and reconnect it, everything seem ok but the ghost touch issue is still exist.

Any suggestions? Plz help me, thank you.

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Hello Kaye,

Defective display assembly, flex cable or pin damage and improper seating can all be causes of ghost touching.

Temporarily hook your display to the logic board and power on your phone without seating the display within the housing; simply hold the display up above the phone while connected and see if you experience ghost touching. If not, then the cause is likely from improper seating - maybe a cable is being pinched or the metal backplate on the LCD is touching a component in the phone where it shouldn't. Even look for a loose screw that may be lodged somewhere in the phone. Also check to see if the EM shield that covers the proximity/front camera flex cable is in the correct orientation.

I have found when replacing the iPhone 7 display that the metal backplate doesn't always like to sit flush around where the cables. Reassemble the display into the phone making sure everything fits properly.

Hopefully your replacement part is good and there is no connector damage. Likely, something is misaligned and causing an electrical short that disrupts the digitizer.

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Hi,

This could be a few issues.

The main culprit might be cable damage, you may have accidentally pinched the cables when closing it up.

Or, it could be screen quality, if it's a copy screen, these can have issues, or might be a faulty screen, try get a replacement.

If a replacement doesn't fix it, then you'll need to look at possible logic board damage, connector may have been damaged, or something knocked off.

Definitely try a new screen though. :-)

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After checking with Chinese phone repair shops, which has large volume of business and a lot of experience on the subject matter, these are what they found.

iPhone 7 screens are more sensitive to individual variances and screens made by different suppliers like LG,Toshiba, Sharp have different sensitivity, in the factory the phones are calibrated on the line so there is no problem. However depending on how you've swapped the screens, you may encounter ghost touch or insensitive screen.

On the backlight plate, assuming the screen is not a Chinese workshop remanufactured unit that Frankenstein parts together,

Toshiba screens have manufacturing code beginning with C11 or F7C,

LGs have DTP or C3F,

Sharps have DKH or C0N,

Crossing between Toshiba and Sharp gives you about 5% chances of bad touch, while crossing LG into or out of the equation has around 50% chances of ending you with bad touch because LG sensitivity range distribution is very different from Toshiba or Sharp. Without the official Apple calibration magic box, it is very likely to not work properly if your phone is built with LG screen but reinstalled a different one, or the other way around.

So that magic calibration box has its value after all, unlike Louis Rossmann said it is just there to !#^& 3rd party workshops off.

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Kaye will be eternally grateful.
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