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Released on September 19, 2014, this 4.7" screen iPhone is the smaller version of the iPhone 6 Plus. Identifiable by the model numbers A1549, A1586, and A1589.

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Touch ID inconsistent after screen repair

I have just completed the front panel replacement. The Touch ID extender flex attached to the LCD metal shield was a pain to remove. I removed it leaving the small metal plate and refitted to the panel.

At first boot, Touch ID was working but the next time when I tightened everything up it refused to initialise the sensor. How important and why is this small metal plate important? Could it be that I damaged the flex behind the LCD and could installing a new cable not button fix the issue?

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Most Helpful Answer

Hi Andrzej,

I am not sure if this will entirely solve your problem but it should at least answer a few of your questions.

The metal panel that you removed serves as a heat barrier between the screen and the internal components of the iPhone as the backlight can generate a fairly large amount of heat. It also serves as an electromagnetic barrier to prevent the high voltages used for the backlight/screen from adversely affecting the phones internal components. I would suggest you reinstall it but thats up to you.

As for why Touch ID isn't working, there are a few potential causes. It could be that the metal barrier not being there is causing interference with the cable, so I would first try reinstalling that. Then check the contacts of the cable, and make sure the connection points are clean (95% isopropyl alcohol and a q tip with some type to dry are great cleaners). It could also be that you tore/kinked the cable when reinstalling: in which case replacing the cable should fix the problem. If you have a multimeter (5$ on amazon) you could test this, comment if you want more specifics on that.

There is also the possibility that you damaged one or more of the connectors when replacing this item and that is causing the connection issue. If the connector damage is only on the cable, replacement should still work. If the other components are damaged, I am not sure what the solution to this problem would be (if there is one), as there are a lot of external factors involved.

From my experience, sometimes when disconnecting/reconnecting these cables, just leaving it will fix it. I had an iPhone say the Touch ID was unable to be initialized and then one month later it started working again, randomly...

Hope this helps!

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Found this answer on a similar question, I think this is your problem:

The metal plate that is on the back of the home button extension cable is a grounding plate. I've see this problem before with intermittent Touch ID problems after one of my technicians accidentally separated it on a screen replacement, and replacing that cable with a new one with the metal backing plate solved it.

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Yeah once that small metal plate behind the home button extension cable connector to home button is gone it really needs to be replaced as touch ID issues occur just because of that missing.

If it stops working after screen replacement I change that immediately if it has no Metal piece to it without extra charge to clients as it doesn't cost much.

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Go to settings,general,reset and choose rest all settings which is the first option. After that set your Touch ID

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Andrzej Grabowski will be eternally grateful.
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