Update made screen unresponsive.

[jbresee]

Hi,
My Z4 just asked to update the ROM, and afterwards, the screen has areas that are no longer touch sensitive.

Is anyone else experiencing this issue?

Thanks for any ideas!
Jim

 

[Nollie2]

Have you tried rebooting, then opening the Diagnostics app and running the touch screen test? If there are still dead spots showing in the test, you might want to flag it to Sony support.

I'm not certain if it's a software or hardware issue, but I have found both pre and post-update, that the touchscreen occasionally becomes less responsive, to the point that trying to use a drag gesture doesn't work without the touch dropping out. This happens every couple of days, and I suspect it's to do with throttling as it coincides with very sluggish performance. Seems to resolve itself when left for a few minutes, or a reboot.

 

[tripleacs]

Yes! I thought it was just me. I have a tempered glass screen protector and removed it to confirm whether it was causing the issues. Also ran the diagnostics which ran just fine.

It seems to be perfectly fine after a reboot and then the longer you go the worse it gets.

Hoping that this is fixed in the 5.1.1 update whenever that happens.

 

[Nollie2]

The conditions that this occurs does seem extremely sporadic. After playing Star Wars Uprising for ~45 minutes yesterday morning, the touch screen failed to recognise any swipes or taps, to the point I had to force a restart with the power button to exit the game. After leaving the Z4 for 15 minutes, no issues at all.

Last night I managed to play the same game for over 90 minutes, and today for another 90 minutes with no problems at all.

I'm starting to think that it could be performance throttling, alternatively I have noticed the screen getting particularly warm above where the SOC sits. Could this temperature be affecting the screen sensitivity? Using CPU-Z I have found some of the sensors reporting around 70C, battery around 35C, though this is after running intensive games. I'm unsure if the upper temperature is normal for this type of chip or not.

Sent from my SGP771 using Tapatalk

 

[Weltherrscher]

I have the very same problem:
Tempered glass from IVSO and the original case from Sony.
Since the update the touchscreen is VERY unresponsive.
I removed the case (!) and it got better (seriously, WTF?).

 

[2xmanman]

Does it mean to remove the tempered glass will solve the problem?
But it was fine before upgrade to 251. Sony sucks...

我從使用 Tapatalk 的 SGP771 發送

 

[jbresee]

I reset to factory settings, and that may have cleared it up... but I'm not positive.
I'll update this thread when I play with it some more.

Did anyone have success with removing the screen protector?

 

[jbresee]

OK - I can confirm that a factory reset after the upgrade does not solve the problem. My tablet cannot pass the touch screen diagnostic.

 

[Weltherrscher]

Does it mean to remove the tempered glass will solve the problem?
But it was fine before upgrade to 251. Sony sucks...

我從使用 Tapatalk 的 SGP771 發送

I removed the case, not the screen protector.
But some issues are left, so i hope for the next FW-Update...

 

[jbresee]

An update:
I reached out to Sony's support group. They suggested downloading the PC companion app and having it reflash the .251. This does a factory reset.
This made the touchscreen response significantly worse.
My next step is to see if they will let me downgrade to the previous release, because the tablet was working flawlessly on that release.

 

[jbresee]

Sony support says you can't downgrade to the previous rom. I found flashtool, but can't find the old rom to flash onto the tablet. Still looking...

 

[moneyloo]

Noticed the same thing after the update.. Hoping for a fix soon as it was flawless before the update.

Now simply browsing is annoying because it either misses swipes or registers them as longer swipes, causing the page I'm trying to read to scroll down super fast as if I flicked it when I actually scrolled slowly. :crying:

 

[jbresee]

There is no update coming. Sony does not acknowledge that the problem exists.

 

[2xmanman]

Need more people to post on Sony offical forum, tell them this problem.

 

[jbresee]

I'm hoping the .253 version helps this problem. It doesn't appear to be available for anyone yet.

 

[petzku]

Sony support says you can't downgrade to the previous rom. I found flashtool, but can't find the old rom to flash onto the tablet. Still looking...

Here is a complete tutorial about flashing any firmware on your Z4 tablet, even downgrade to an older one.

http://www.xperiablog.net/2015/03/1...peria-lollipop-using-xperifirm-and-flashtool/


I flashed Nordic version of 28.0.A.7.24 firmware and my touchscreen sensitivity is back to normal

If you have any questions about the flashing procedure feel free to ask.

 

[laggist]

I had this exact problem after updating to 224. Ran the Sony Pc companion program on my windows pc and did a full software restore on my z4. problem solved.

 

[riveria]

I had this exact problem after updating to 224. Ran the Sony Pc companion program on my windows pc and did a full software restore on my z4. problem solved.

I'm not sure whether is it because of root or Xposed, but after doing a factory reset, the touchscreen seems a bit more responsive. It is after rooting or installing xposed that the problem comes back up.

 

[jelbo]

I'm not sure whether is it because of root or Xposed, but after doing a factory reset, the touchscreen seems a bit more responsive. It is after rooting or installing xposed that the problem comes back up.

Ah, I also have intermittent touch problems. Until now I kept thinking it's because my finger is too cold or something, but I have it since upgrading to .224 also. Rooted and running Xposed v.85.1.

 

[riveria]

Ah, I also have intermittent touch problems. Until now I kept thinking it's because my finger is too cold or something, but I have it since upgrading to .224 also. Rooted and running Xposed v.85.1.

Yea, I kinda think it's either because of root or Xposed that's interfering with the touch sensors. But I'm kinda leaning onto to Xposed that's causing the problem.