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2014年9月19日に発売されたこのiPhoneは4.7インチのスクリーンサイズでiPhone 6 Plusの縮小版です。

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iPhone 6 ghost touches/multiple faulty displays

tl;dr - I have had multiple faulty screens and I’m not sure if it’s my fault, or something is wrong with the phone, or if the supplier is bad.

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A few weeks ago I dropped my iPhone 6 and smashed the screen. Therefore, I bought a replacement display ("Replacement For iPhone 6 - LCD Screen Assembly - Black - Premium Quality" from iParts4u) and tested and fitted it soon after.

However, this replacement had a fault which was that a vertical strip along the right hand edge of the screen did not respond to touch, as well as a square in the top right hand corner. I then returned this screen for a replacement.

The second screen they provided to me I tested without fitting, and also had a fault which was that the screen had vertical lines on it and kept dying/dimming to black, so I returned that one also.

They later told me that they couldn't find an issue with the first screen but the second one was cracked and this may have happened during transit.

I am now on to my third screen, and whilst this initially seemed to work ok, it has developed a phantom clicking problem, whereby random things on the screen will be touched/clicked when I clearly didn’t click them. In addition, the touch/digitiser sometimes stop working altogether (may be because the phone thinks it is already being touched somewhere else, so will not allow a second gesture).

This can be temporarily solved by locking and unlocking the phone. This also seems to happen in the areas where there is finger grease on the screen, but when I wear touch sensitive gloves and use the phone the issue still happens occasionally.

​This leads me to one of three conclusions:

  1. My installation method is wrong and/or is damaging the screens. However, given that the OEM screen’s touch still works fine every time I re-connect it, this seems unlikely. I also made sure to follow the iFixit guide, including being careful about things like keeping screws in the right positions to avoid long screw damage, as well as working on a grounded anti-static mat and wearing a grounding strap attached to that at all times.
  2. There is something faulty with the phone itself, such as a bad touch IC that was damaged during dropping the phone. Alternatively, screens 1 and 3 could be shorting on something when they are fitted to the phone, which wouldn’t have shown up during the dry run. But again, why wouldn’t the OEM screen also be affected by either of these issues?
  3. The supplier is consistently giving me faulty screens and I should switch.

I have now filed for another replacement and whilst the supplier have agreed, they have mentioned that this grade of screen has less than a 1% failure rate, so getting 3 in a row that are faulty seems very unlikely.

If this is my fault or the phone is faulty, then I’d rather not waste their time asking for more replacements, but if they are sending me faulty goods then I should switch.

Does anyone know which of the three above faults might be causing this, and/or have any experience with this supplier?

Thanks in advance.

Edit: Attached some pictures of the two screens/LCD shield for context in a comment - iParts screen is on the left of the image, smashed OEM is on the right.

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This is a bit tricky and one of the reasons why I never sell my screens to DIYers. Not talking bad about anyone who is brave enough to try this repair, but I know how many things can go wrong. And I've ruined quite a few screens in my days until I learned to have a light hand.

So based on your description, I would say that most likely all the failures are due to a bad part or a botched repair - as opposed to a bad logic board that may be causing these issues.

Lines, squares, artifacts on the screen, screen fading out, and missing touch lines can all be either bad screen cable, or badly inserted connector. Or damaged connector on the board if you've been rough on them.

Screens ghosting (multi touching by themselves) are most often bad screens.

Finally, most screens on the market are very cheap copies that fail out of the box or don't last at all.

To make a long story short:

1- Pay a bit more and buy from a reputed seller. Believe me when I say that we (as in third party repair shops that care for our image, our customers, and care to perform a repair once and not have it come back for warranty) most often pay wholesale prices that are higher than retail prices on Amazon and Ebay and similar vendors. That's because there are so many various types and qualities of screen assemblies, that they can start very cheap (around $10 for an iPhone 6 screen) and double, triple, or quadruple in price. A good tech knows to avoid the cheap quality as they equal headache, as you just experienced yourself. The screens that iFixit sell on their website are a great option in my opinion and I often use them.

2- You have to make sure the connector on the logic board is clean; not broken; no black plastic bits at the “corners” having been smashed into the connector, thus preventing the screen connector from clicking in properly. Use a magnifying glass to examine it. Bare eyes are seldom sufficient to notice this kind of damage.

3- You make sure the connector on the cable of the LCD is straight, not “banana'd.” The touch connector which is the widest one usually bends very easily, doesn't sit properly in its slot, thus causing many issues with touch.

4- You have to have a very light hand. The LCD cable connectors are welded or connected on their other end to the LCD and digitizer. If you push the connectors on the LCD cable in place and don't have slack on the cables (as if you are pulling the cable away from the screen), you'll cause tiny fractures where the cables on the other end attach to the LCD and digitizer, which may cause many issues as well.

5- Finally, if the old screen is still showing an image and touch is still working on it, fit it back to see if you have any touch issues. This is a good way to isolate the cause of the touch failures. If both screens fail the same way, you have a bad board or bad connector on the board. If one works perfectly and the other not, the latter is bad.

Good luck!

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Hi @rany, thanks for your advice, I managed to find some time to take the phone apart again today and test the iParts4u screen.

First thing I did (after the usual battery and LCD shield removal and battery disconnect) was to remove the new screen and spray the sockets on the board and connectors on the screen with isopropanol and then dab them dry with some microfiber paper. Then, I reconnected the new screen again, but within minutes it was showing the same ghosting as before.

Next, I tried connecting the old cracked OEM screen and it still had 100% normal touch functionality. Neither of the screens seemed to have bent connectors (or at least not noticeably bent by eye – I’m still in the process of deciding on getting a microscope or not).

Therefore, based on your comments and my own suspicions, it seems like my third conclusion (bad screen quality) is the most likely, as if I was being too rough with the screens you would expect the OEM one to also not work, but the touch still functions 100% fine.

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I took some pictures of the backs of the two LCDs side by side (now attached to the OP), and the one thing that stood out to me (other than the scorch marks on the shattered OEM screen’s backlight) was the rough finishing near the bottom of the iParts screen. This seemed consistent with what I’d noticed during installation, which was that not only were the connectors mushy and hard to seat in the sockets properly (unlike the OEM screen’s connectors), but aligning/seating the front camera + sensor flex at the top of the LCD was also very difficult and felt forced, whereas fitting it in the OEM screen was much easier.

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Lastly, I also noticed that the iParts screen doesn’t have a small metal pad attached to it near the home button, whereas my OEM screen does. However, having looked at the new LCD shield (third picture), it seems that this metal sticker is also on there, and when I look at the old OEM shield that I removed, it is missing, so I’m assuming that this is just something that was meant to stay on the shield when I removed it and not remain stuck on the LCD?

As a side note, it also seems some of the coating on the sensor flex (also from iParts) has rubbed off and exposed some of the cable/silvery metal underneath, which can sometimes cause shorting issues and disable the light sensor (but not the front camera or speaker), and which looks similar to the exposed metal at the bottom of the iParts screen. This suggests that this part is bad quality also, but it may have instead been caused by the tight fit on the iParts LCD scraping the flex cable when I tightened down the metal retention bracket.

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I did actually take a look at the iFixit parts before going with iParts4u this first time, but I guess I'll just have to bite the bullet and go with iFixit for my LCDs going forward.

Finally, would you say it's also necessary to go with iFixit for some of the less complicated parts like the battery, front camera + sensor flex, antennae, LCD shield, etc.?

I only ask because the biggest reason I didn't want to go with them (EU store) initially was because they seem to put a steep markup on every single one of their parts (not just the LCD). The worst I found for the iPhone 6 parts was the home button which is £26.36! That’s over 9.7X the price of somewhere like iParts4U which has it for £2.71. Other parts were usually around the 2X range in terms of base price.

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Lastly, we have shipping, which is £7.83 for 3-4 day shipping to the UK if you spend under £71 per order, whereas at iParts it is usually £2-3 for items other than batteries (that require special shipping), for next day shipping (First Class Royal Mail), and is scaled with each item you add rather than requiring a minimum total for decent shipping.

In addition, they don’t seem to have the same range of parts as places like iParts, as at iParts you can buy really small individual parts such as home button gaskets, home button, LCD or power shields, a full set of screws, a single pair of pentalobes, individual foam pads, stickers and adhesives and even individual ICs for reflow work, whereas iFixit offers none of these. This helps again to reduce cost/waste by letting you only buy the parts you need.

Once again, thanks for your time in answering my above questions, as well as my OP.

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Hi Scott,

Thanks for writing on here, it sounds as if the issue is with the phone, I think we were pretty good to keep suppling the LCD screens to you, considering the issues. If you are still getting the issue we would be happy for you to send the phone to us so we may have a look at the phone to see if we can get to the bottom of the issues.

Best Regards

iParts4u

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Scott Nelson さん、ありがとうございました!
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