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Ghost touches and unresponsive area on lower screen


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5 hours ago, SchattengestaIt said:

I'm wondering now if cleaning something or removing and reinserting the display cable could help. Or is the touch cable not the same as the display? Is there a dedicated touchscreen processor that could have corroded?

There is a long thread about this issue causing "Ghost touches".
Basically the root cause of the problem is the same (and also phone which have "Ghost touches" are having this blind line)... there are two ribbon cables coming from display at the bottom side (in portrait orientation). A very wide cable contains display signals and a narrow cable contains touch signals.

There is a dedicated touch processor at the back of display but most likely the ribbon cable broke somewhere (either the cable or the glass to cable connection).

I never heard removing and reinserting display cable worked for anybody here, it did not work for me.

I am afraid you need to buy a new display.
There is an Aliexpress seller recommended by F(x)tec (it was linked in this forum but I don't have it saved).
I have ordered screens for Elephone U Pro which works for me but basically every displays have some minor problems like missing part of one or two corners on display.

Edited by VaZso
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Just a quick follow up... F(x)tec Support sent my replacement screen out on Friday, I received it less than 24 hours later, replaced it as per their video instruction, and it's now working perfec

Alright.... I received my screen today, replaced it. Phone works again as it should!

I still did not use the new display too much, but I feel I have a working Pro1 again. ūüôā I mostly notice the working of touch panel is smooth again, so I was not able to enter my unlock pattern while

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@VaZsoThank you for your profound answer and description. I had seen the ghost touches thread but didn't think the reason would be the same - thanks to the moderator for forwarding this thread.
I've now ordered two of the cheap elephone screens (since they are 32‚ā¨ instead of 80‚ā¨) and will replace the screen as soon as it arrives. If anybody knows a keyboard cursor app (probably designed for external keyboards) which allows us to use the keyboard as a mouse cursor, that would be interesting.

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I ordered this:¬†https://de.aliexpress.com/item/32956500815.html and it works perfectly. Arrived within 10 days, I found it challenging to remove the old display, because it was broken and the glue on the top edge was so sticky that the display tore apart ‚Äď and I needed a cutter to remove the remaining glass and glue. Other difficulty: I received 4 glue stripes to attach the new display, and I put two at both sides first ‚Äď and that didn't work at all. Somehow most of the display actually does not touch the underlying case. It's holding well with two stripes at the bottom and the top but nothing holds the edges. Apart from the difficulties I encourage everyone to do it yourself, it took me 45 min, and I have never done this before and the result is great.

 

Now I have another issue. While having the ghost touches I disabled the left and right edge of the display: I somehow disabled touch input there, but not the screen. And now I can't undo it ūüėĄ I already tried with "wm overscan" but I have Android 11. I remember searching for a long time to disable it (without an app that's constantly running), I already had a look at the history, but no, I can't find it anymore. I also turned off the margin setting. Anybody an idea?

Edited by dreamflasher
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@dreamflasher I'm afraid it wasn't you who adjusted those margins, that's how those displays come from the manufacturer these days. It's an internal predefined minimum for those margins, to which Android's margin settings can only add, they cannot substract. And non-stock ROMs have no way to reset them to the Pro1's defaults. To date, with current custom ROMs the only way to get the original margins back is is to flash stock Android, then flash your preferred custom ROM. 

There's a long thread about it:

 

Edited by Rob. S.
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18 minutes ago, Rob. S. said:

@dreamflasher I'm afraid it wasn't you who adjusted those margins, that's how those displays come from the manufacturer these days. It's an internal predefined minimum for those margins, to which Android's margin settings can only add, they cannot substract. And non-stock ROMs have no way to reset them to the Pro1's defaults. To date, with current custom ROMs the only way to get the original margins back is is to flash stock Android, then flash your preferred custom ROM. 

There's a long thread about it:

 

Oh wow, Thank you so much Rob! I would have continued searching for hours. You made my day. Happy Easter! ūüėĄ

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  • 3 weeks later...

Hi everybody,

I'm posting this just for the sake of statistics. In September 2021 my Pro1 also started to develop these ghost touches and the unresponsive area at the lower part of the screen. FxTec replied to my ticket after approximately 3 weeks and we figured out the issue is covered by warranty. This was great! Unfortunately no displays were available then.  Now, in May 2022 I still have not heard from the support team, and my display was still broken.

Yesterday I received a replacement screen from Aliexpress and installed it today. I have some problems glueing into the right position. As it was my first display swap I am satisfied with my work, nonetheless. Let's see how it performs as a daily driver.

Unfortunately the topic covered in thread

also applies to these displays.

 

BR

Xelo.

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I replaced my display as well. I ordered the same part as dreamflasher and it works fine. Unfortunately, it's not done removing the screws and just replacing the display since there's a custom made plastic bracket that holds the entire display in place which is glued together. A hot air gun (an hairdryer probably works as well) is needed.

The good thing is that tools and glue strips are provided and the back side of the new display comes with a not too strong glue so there's no risk of losing the display but you still can remove the display if it breaks again. For 40‚ā¨ that's great service and well thought out.



What I find interesting as well is that the faulty part is NOT the ribbon cable but a stationary, non-moving (flexible) cable in the display itself. Can somebody explain that to me?

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1 hour ago, SchattengestaIt said:

What I find interesting as well is that the faulty part is NOT the ribbon cable but a stationary, non-moving (flexible) cable in the display itself. Can somebody explain that to me?

My theory is that part (a wide ribbon cable at the bottom of display in portrait orientation) is start to move when glue of the display starts to release - only a slight moving of the display in its frame may sooner or later break that ribbon cable or glass-to-ribbon connection may releases which can cause touch or display-related issues.

So a theoretically non-moving cable can start moving if display start to detach from its frame.

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9 hours ago, SchattengestaIt said:

So it's not the cable with the connector but a non-visible connection between display and touchscreen that causes this issue?

The cable is basically visible, look at the photo below:

On 4/18/2021 at 4:27 PM, VaZso said:

a.thumb.jpg.7e3f03880c71efdb0061bf58fcc5128a.jpg

The ribbon cable circled with "1." is the potential cause of the problem.
The green cable is the cable of display and the black on the right is the touch cable.

These cables may break by moving but most probably their connection to the display "glass" can release caused by movement.

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