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[Q] Screen flickering under WiFi data transfer

Hi,
I have my sgs about 2 months and I'm very happy with it. The only problem I have is, that sometimes there are strange displayinterferences.
It looks like there are moving waves from top to down.
Does anybody have this troubles too and has a solution for it?
Or is it an hardware error? The problem is that the error isn't reproducable.
Maybe somebody can help me, please!
Thanks in advance
spyro

I think I have also noticed that once or twice. I believe it can be seen when you have the android drop down menu (notifications etc) open and you start or stop WiFi. It must be some kind of interferance with wifi hardware. Normal wifi operation does not cause it, only the startup of the WiFI which lasts one second or so.

Yeah, i think this could be true. I also see it often, when I open die Notification bar. But I also have the same interferences, when I am working in apps. Maybe also the 3G connection could be the reason? Does anybody else have this problem.
Is this a problem, which I have to life with or could this be an error of the hardware(warranty)?

http://forum.xda-developers.com/showthread.php?t=753402
I have the same problem. Never on wifi tho.
Which firmware are you using?

Hi,
my firmware is I9000AUJF1(A1 branded from Austria). I don't know if the problem in your posted thread is the same. The interferences I mean only exist one or two seconds. There are horizontal dark lines which moves from top to the bottom. After some time everything is OK again. It looks like anything interfers the display(wifi, 3g?).
The problem of warranty is, that I'm not able to show the problem, because it's not reproducable.

Screen flickering under WiFi data transfer
I noticed this problem a couple of days ago.
Whenever there is some data transfer going on over WiFi, wherever I am browsing or some service syncs up the screen starts flickering and I have what I can describe as faint scan lines crossing the screen vertically like there is some sort of interference.
These are mostly noticeable on white and light grey backgrounds.
I have gone trough 2 firmware updates currently being on stock JPK rooted.
I have searched around on google and found on some forum one guy that was saying the cause is an interference between the WiFi module and the screen refresh rate.
Has anybody encountered this problem or these symptoms ?
Is there somebody around more knowledgeable in this issues that can confirm that this is a hardware problem ?

wow! , you might have a defective phone then.
I use WiFi very often, Wireless N at aprox 87 Mbps
that should be high enough to reproduce the problem you experienced, if i had a faulty screen
the description of the scan line reminds me of interference when you are in close proximity with another LCD or CRT screen causing the distortion field

OMG, I get this too. Usually happens on boot or when I'm browsing a data heavy website or using Android market. Are our phone defective? Does anyone else have this problem? I wonder how common it is.

does the scan line comes from bottom up
or goes from top to bottom?
very slowly or fast?
if you are pluged in and charging, also are you in a 120v or 240v?

AllGamer said:
does the scan line comes from bottom up
or goes from top to bottom?
very slowly or fast?
if you are pluged in and charging, also are you in a 120v or 240v?
Click to expand...
Click to collapse
They tend to be random and I'm on battery power atm. Also they're quite fast but don't last very long. They'll start then stop then start etc ..

Hi,
just for your information. I've sent my phone to samsung on friday. Maybe they find the error. I report, if there are new information.

Yep i have the same problem. Can t find the source though....
Sent from my GT-I9000 using Tapatalk

The lines appear from top and travel the screen fast.
Imagine a TV who for a second has problem with reception.
I am on 240 V.
Also the issue is much more noticeable when not plugged in.
If I have the phone plugged in its barely noticeable.
I will try to call the service and ask about this issue. I have a strong feeling that this is a hardware issue. But Besides the screen being defective I also think about the battery. Maybe when in high load (WiFi) it's voltage varies and affects the screen.

It seems if I uncheck Power saving mode in Settings>Display and also uncheck Automatic brightness things improve a bit.

segun_aduba said:
The lines appear from top and travel the screen fast.
Imagine a TV who for a second has problem with reception.
I am on 240 V.
Also the issue is much more noticeable when not plugged in.
If I have the phone plugged in its barely noticeable.
I will try to call the service and ask about this issue. I have a strong feeling that this is a hardware issue. But Besides the screen being defective I also think about the battery. Maybe when in high load (WiFi) it's voltage varies and affects the screen.
Click to expand...
Click to collapse
Another issue to worry about .. God starting to think about selling this phone and getting something else. Stuck in a 2 year contract though

some one already reported this on another topic
it does seems that some version of the phone are prone to WiFi interferance
we still haven't found out what causes it exactly
for example i can not replicate the issue on my phone when using WiFi

found it
http://forum.xda-developers.com/showthread.php?t=793944

Cant reproduce it.
Not that I'm unhappy with it...

If this is a hardware issue Samsung should replace my phone. I am waiting though a little bit before calling the service to make sure that it is a hardware problem.
If I find that it can easily be fixed with a software fix, it's not worth the hassle of trying to replace it.

can anyone in North America confirm this issue?
i got a huntch it might be an Europe only issue related to the high voltage of the electric interferance nearby, like lights, tv, radio, wifi, etc.

Sick of samsung's bad displays

So my display after being replaced 2 times in 6 months started flickering. My phone is very hard to be turned on because of the green flickering.
I just want to upgrade to a S6,S7 Edge or non edge. i just want to know if they have the save problem with displays ? I want to have a phone at least 2 years, can you recommand me a phone like that ?
I was just considering switching to a iPhone even though i prefer android on phones ... o how are S6,S7s displays ? Samsung still have the same problems?

Samsung improved a lot on screen quality in S6 and after, so you should be okay

Dieexe said:
Samsung improved a lot on screen quality in S6 and after, so you should be okay
Click to expand...
Click to collapse
So no more sudden flickering problem ? I mean i didnt even dropped the phone or something like that.

RootNightmareX said:
So my display after being replaced 2 times in 6 months started flickering. My phone is very hard to be turned on because of the green flickering.
I just want to upgrade to a S6,S7 Edge or non edge. i just want to know if they have the save problem with displays ? I want to have a phone at least 2 years, can you recommand me a phone like that ?
I was just considering switching to a iPhone even though i prefer android on phones ... o how are S6,S7s displays ? Samsung still have the same problems?
Click to expand...
Click to collapse
green flickering problem just for auto brightness problem (some custom Roms have this issues) if u will untick the auto brightness u will not have this problem

Not really, it has more issues on this "display green flickering " , on my S5 i dont get display on if the temperature around it getting cold .
Sent from my Samsung Galaxy S5 using XDA Labs

atakan1986 said:
Not really, it has more issues on this "display green flickering " , on my S5 i dont get display on if the temperature around it getting cold .
Sent from my Samsung Galaxy S5 using XDA Labs
Click to expand...
Click to collapse
Wow that's amazing. Been using samsung s5 exynos version for the last 1yr. Never had that kind of problem till date. And it have the same display as snapdragon version. And on comparison I found that this is by far the best display out there when compared to other brands.
Maybe perhaps you might be having a faulty unit from the begining.
Sent from my SM-G900H using Tapatalk

I have the same problem here with the display and it's not a software problem (same by original os 6 and same by cyanogenmod 14).
After the temperatures are under 10 C. i can't open my s5 with home button i must do it over the power button.

Using S5 for more than 28 months still I have not faced any issue. I just had to buy new charger apart from that not a single problem and yes I mess up with my phone so much but I still working and no display failure yet. And also I have dropped it many times, it still refuses to die.
You are just having a defective model or some internals of the phone are messed up. Because Samsh*t produces one of the best displays..

shurupi said:
I have the same problem here with the display and it's not a software problem (same by original os 6 and same by cyanogenmod 14).
After the temperatures are under 10 C. i can't open my s5 with home button i must do it over the power button.
Click to expand...
Click to collapse
So when its over 10C its ok ? Then i should sell the phone when its summer )

nikhil007.n2 said:
Using S5 for more than 28 months still I have not faced any issue. I just had to buy new charger apart from that not a single problem and yes I mess up with my phone so much but I still working and no display failure yet. And also I have dropped it many times, it still refuses to die.
You are just having a defective model or some internals of the phone are messed up. Because Samsh*t produces one of the best displays..
Click to expand...
Click to collapse
At least for s5, the internet is full of this faulty displays, even my friends have same problem.

RootNightmareX said:
So when its over 10C its ok ? Then i should sell the phone when its summer )
Click to expand...
Click to collapse
Very simple but good idea my friend : )
Sent from my Samsung Galaxy S5 using XDA Labs

RootNightmareX said:
At least for s5, the internet is full of this faulty displays, even my friends have same problem.
Click to expand...
Click to collapse
This may be problem for Snapdragon variant then.

nikhil007.n2 said:
This may be problem for Snapdragon variant then.
Click to expand...
Click to collapse
Maybe thats a point, but shouldnt only the processor be different? I assume the display is.the same for both...

nikhil007.n2 said:
This may be problem for Snapdragon variant then.
Click to expand...
Click to collapse
Nope, Exynos variant have this same problem

Im also facing green flickering and blinking at low brightness.
Sent from mySM-G900F using Tapatalk

baseer_IF said:
Im also facing green flickering and blinking at low brightness.
Sent from mySM-G900F using Tapatalk
Click to expand...
Click to collapse
Its not a good sign. Try disabling your light sensor. Even then if you experience such a problem than it means that your flex cable that attaches the screen with the motherboard needs to be changed.
Sent from my SM-G900H using Tapatalk

redhotiron2004 said:
Its not a good sign. Try disabling your light sensor. Even then if you experience such a problem than it means that your flex cable that attaches the screen with the motherboard needs to be changed.
Sent from my SM-G900H using Tapatalk
Click to expand...
Click to collapse
I try to disable Auto brightness. but in manual the problem is persist when when brightness is full low .
if brightness is normal it is normal
Sent from my SM-N9300 using Tapatalk

RootNightmareX said:
At least for s5, the internet is full of this faulty displays, even my friends have same problem.
Click to expand...
Click to collapse
Hi,
Yes and expect the same problems with the following generations. It's an amoled screen thing. The green colour happen when there's a colour displayed on the screen for a very long time (for example, I have a green on my screen of the size of my keyboard).
I think a solution to this problem is to set the display to turn off after 30s (it saves battery too) and maybe, if you're using a custom keyboard, change the colour from time to time. Use the brightness of the screen to a lowest which would still be comfortable to you (and auto unticked).
This last tip alone is enough to prevent greening. My flickering happened after an incredible fall (it had a tempered glass so the screen was safe). The flickering showed green what it had in memory.
Samsung has a 2-year guarantee for its products so you shouldn't worry for that period of time. Problem not solved, replacement.
Best of luck

Superlion721 said:
Hi,
Yes and expect the same problems with the following generations. It's an amoled screen thing. The green colour happen when there's a colour displayed on the screen for a very long time (for example, I have a green on my screen of the size of my keyboard).
I think a solution to this problem is to set the display to turn off after 30s (it saves battery too) and maybe, if you're using a custom keyboard, change the colour from time to time. Use the brightness of the screen to a lowest which would still be comfortable to you (and auto unticked).
This last tip alone is enough to prevent greening. My flickering happened after an incredible fall (it had a tempered glass so the screen was safe). The flickering showed green what it had in memory.
Samsung has a 2-year guarantee for its products so you shouldn't worry for that period of time. Problem not solved, replacement.
Best of luck
Click to expand...
Click to collapse
The funny thing is i already did "by mistake" all the tips you said and still have this. Never dropped the phone though. This problems seems very big though, i expected a burn in to be the biggest problem, but to have flickering at a level that i cant turn on the phone. I wanted recently to switch to a Nexus 6p, but knowing that it uses Amoled too, its a bad ideea. So the only "solution" is to switch to IPS screens? (btw i want a phone that holds on for at least 3 years)

In my research thus far, the AMOLED screen technology is to blame. When the display circuits get old or damaged, they don't sustain current at low power settings. In LED screens, a back light controls brightness, but AMOLED screens send current to each pixel for brightness control. If the circuit is damaged, or any corrosion has built up inside, this could attenuate the current below the point required to sustain light flow. I see this problem with some LED and CFL lights on motion sensor switches. Just enough current goes through the motion sensor to keep it's circuits active, and that current causes a flicker in the light.
With the screen though, since the problem is only resolved when you increase the brightness just a bit above minimum, it seems anything that lowers the display power (auto brightness for example) will cause it to flicker if this setting gets too low. I also noticed that before the screen locks on timer, it dims to low power for a few seconds and flickers as a result. There are apps that attempt to resolve this by putting a translucent black screen over your desktop and apps. This keeps the power up on the pixels but adds a black overlay, kind of like a screen filter. You can adjust the darkness if you need it to save your eyes when reading in the dark but it doesn't help save power any. They also require a rooted device, which could void warranties. The reason for this I believe is because apps are supposed to operate in a way they don't intrude on each other, and a filter that lays over your screen does in fact alter the output of your display rendering. With the added security concerns of these apps possibly collecting screen shots and sending them to another site, I would avoid this. Best to use a physical screen overlay you can put on or remove as needed as long as it doesn't interfere with your touch screen options.
Ultimately, these devices were meant for replacement every 2 to 3 years so if you're like me and you like to make your investment last, best thing to do is apply any work around you can come up with. A repair shop may be able to wipe the circuit boards down with a solution that clears away corrosion, but it won't repair any weakened pixels. I'm still using a Samsung S5 G900F
- And i finally got this fixed. it sounds like the reason for this is that since the latest update your phone cannot decide whether to use hardware or software back light settings. I managed to make the problem go away by doing this:
Go to settings >> system >> About device.
Find "Build number" and click 6 times fast on it.
You will then get the message saying: "You are now a developer"
and then go back to Settings >> system >> Now you will see the "Developer Options"
Now go to Developer options >> Drawing Section or Rendering Section >> Find "Turn off hardware overlays" or "disable hardware overlays" >> This will force the phone to always use GPU for screen adjustments. no more flickering.
but If I turn the brightness ALL the way down, it still flickers like crazy, however, if that's the only time it'll do it, I consider that a win.
Read More :good:

P10 - sensor issues // screen gets dark in the bright sun

Hello dear xda-community,
I just returned from my vacation to Mexico. Whilst being there and taking pictures I encountered a very strange dilemma with the display and the brightness-automatic of the P10: Even if I deactivated the automatic screen-brightness, the system shaded when shooting pictures in the bright sunlight. Which resulted in a barely seeable screen, whereby the S7 of my girlfriend provided a sharp and bright screen.
I really wonder what caused this strange behaviour, and if anyone of you experienced a similar behaviour? I really don't get it why a feature still works when it's deactivated -__-
Thanks, cheerz
J

did no one experience this issue?

I experienced this, too.
But mostly I got it working with manual focus.
The most annoying thing is that the colors are a bit darken with bright sunlight, even if the sun isn't in the picture. The colors seems to be faded, the saturation is very low. See the attachment, the smaller prop plane is blue in reality but on this photo it looks like black, like the background buildings, too.

Hello Janno,
my issue is not with the postproduction, but with the lightsensor which is shading the whole display (even if this option has been disabled)
Thanks for your reply though, I chose a bad headline

Um getting this issue too... After about 10mins in the bright sun light the phone dims...even when i turn off automatic brightness and increase the brightness level it wont work...i think its a flaw on oreo update...when using nougat this never encountered

Jebbel said:
Hello Janno,
my issue is not with the postproduction, but with the lightsensor which is shading the whole display (even if this option has been disabled)
Thanks for your reply though, I chose a bad headline
Click to expand...
Click to collapse
I guess it has something todo with the device temperature - Have the same behavior while using navigation :x

hm... not sure if it's really temperature-driven, since in the lockscreen no dimming took place and the display was shining in brightest and good readable colors.

Jebbel said:
hm... not sure if it's really temperature-driven, since in the lockscreen no dimming took place and the display was shining in brightest and good readable colors.
Click to expand...
Click to collapse
Yeah thats true...

Its a bug in the display, you can turn it off in developer options but it still occurs. I think B365 has a fix for it

is B365 a user here?
Thanks for the help

Jebbel said:
is B365 a user here?
Thanks for the help
Click to expand...
Click to collapse
B365 is an Oreo update.

I am pretty sure it is temperature issue, had it on oreo 360 and 365 after update. It happens while I am driving with navigation (waze)and charging and direct sunlight on the device. Then I take the p10 and place it in front of the air conditioner opening for 30 seconds and everything is ok.

Chillkroete_ said:
I guess it has something todo with the device temperature - Have the same behavior while using navigation :x
Click to expand...
Click to collapse
So for me, it has something todo with the device temperature. I bought a new phone holder, which is placed in front of the Ventilation and my display didnt changed the brigthness anymore ?

Same problem
In application's it get dark even you have automatic switched off. This issue is a really annoying and looks like connected with temperature.

My P10 was/is on B365 as this issue happened. Just got it back today from repairs, of course they found nothing^^
So it seems really to be a software-issue. Any way to fix this?

Camera not working in cold, freezing weather (black screen, camera app crashes)

I've observed some troubling camera behaviour when I'm using the phone outside in temperatures below freezing (a couple of degrees below Celsius seems to be enough). Typically the camera app will freeze (no pun intended) with a black screen, other times it will just instantly crash back to the home screen. I've tried a third party camera app as well, which in the same conditions said that there was no connection to the camera (paraphrasing).
Initially I didn't notice that the problem was temperature related since it persisted after coming indoors, if I had tried using the camera unsuccessfully outdoors in below zero C temperatures. Apparently a reboot is required to fix the problem. However the pattern has since become clear, that the initial problem only happens if I try to use the camera outdoors in those conditions. Although if I have kept the phone stowed away in an inner jacket pocket instead of an outer one it can sometimes keep it warm enough that I can use the camera for a little while before it gets too cold and crashes.
I have never run into any problems with prior phones using their cameras in the winter, even on very cold days 10 or 15 degrees below zero. Is anyone else having the same winter problem with the Huawei P20 Pro or is there a technical problem with mine?

MikeMTS said:
I've observed some troubling camera behaviour when I'm using the phone outside in temperatures below freezing (a couple of degrees below Celsius seems to be enough). Typically the camera app will freeze (no pun intended) with a black screen, other times it will just instantly crash back to the home screen. I've tried a third party camera app as well, which in the same conditions said that there was no connection to the camera (paraphrasing).
Initially I didn't notice that the problem was temperature related since it persisted after coming indoors, if I had tried using the camera unsuccessfully outdoors in below zero C temperatures. Apparently a reboot is required to fix the problem. However the pattern has since become clear, that the initial problem only happens if I try to use the camera outdoors in those conditions. Although if I have kept the phone stowed away in an inner jacket pocket instead of an outer one it can sometimes keep it warm enough that I can use the camera for a little while before it gets too cold and crashes.
I have never run into any problems with prior phones using their cameras in the winter, even on very cold days 10 or 15 degrees below zero. Is anyone else having the same winter problem with the Huawei P20 Pro or is there a technical problem with mine?
Click to expand...
Click to collapse
Hi! Check this issue In your area if other people are using p20 pro and let us know.

Yes, I've the same problem. The camera only works when temperature is above 5 degrees. When temperature is under +5 degrees the camera don't works and appears a black screen, I must to keep the phone in a hot place under my jacket. I restart the camera, I empty the memory cache and the problem continues and persists until the phone reach a normal heat temperature again. I'm also looking for a solution. I'm living in Spain but now is winter and I like to make nice photos with cold weather and snow. May be you know any fix in order to solve this problem?
Thanks

This seems like a somewhat substantial design flaw. Who doesn't want to take winter photos?
I've found that it will work if I keep it in an inner clothing pocket so body heat keeps it warm. Although presumably (haven't gotten around to test that yet) the camera will likely crash if I keep the phone out in the cold air long enough for it to be cooled down to whatever is the failure temperature limit. It's extra annoying that once the camera app has been opened to failure a reboot is required even when back indoors in warm temperatures (if I don't attempt to open the camera app while I'm outside it will work fine again once the phone is warm without a reboot).
This is my first non-Samsung smartphone. I might be going back to Samsung next time.

[email protected] said:
Hi! Check this issue In your area if other people are using p20 pro and let us know.
Click to expand...
Click to collapse
If you mean because of weather differences, the problem first appeared when I visited my family for Christmas 2,500 km NW of here and now continues when I'm back in Bulgaria. All instances of the problem have been with temperatures right around freezing or no lower than -5 to -7 degrees C. No extreme weather conditions.
I don't know anyone here with the same phone - although a friend bought the Lite version recently, I haven't heard from her if it has the same problem - but I might ask in the shop. I'm hesitant to have them take it in for repairs though, I'm guessing they will likely just test it in normal operating conditions (ie. indoors) and send it back with an "all fine".

[email protected] said:
Yes, I've the same problem. The camera only works when temperature is above 5 degrees. When temperature is under +5 degrees the camera don't works and appears a black screen, I must to keep the phone in a hot place under my jacket. I restart the camera, I empty the memory cache and the problem continues and persists until the phone reach a normal heat temperature again. I'm also looking for a solution. I'm living in Spain but now is winter and I like to make nice photos with cold weather and snow. May be you know any fix in order to solve this problem?
Thanks
Click to expand...
Click to collapse
Hey, you can't use the camera under these conditions every time? Does the system update work? What is the version of your system?

I have a P20 Pro too and I live in North of Italy, I took photo in frozen places and even during a snowfall, and sincerely never experienced that issue. I had an issue with camera all around, with continuous force closes, and even popups saying camera is not available. In my case, I solved reinstalling the phone from scratch. I admit i did a whole lot of minor and major updates, always without restoring. Since then, camera worked correctly.

Yesterday i let my phone outside with - 11c and on tripod to capture birds when they eat. I used my galaxy watch to remote camera. 30 minutes outside and all good.

Hello!! Thank you for your help!! Yes the camera only works when is heat +5 degrees, under this temperature crashes. When I am outdoor and is cold the camera don't works and when I come back to home with normal temperature the camera works again.
I have activated all updates and the system version is:
Model CLT-L29
Compilation number CLT-L29 8.1.0.161(C432)
GPU TURBO
Emui/Android 8.1.0
Kernel version 4.4. 103
[email protected] #1
Mon Oct 22 18:56:42 CST 2018
Thank you in advance and thank you for your reply.
bobo have a dream said:
Hey, you can't use the camera under these conditions every time? Does the system update work? What is the version of your system?
Click to expand...
Click to collapse

[email protected] said:
Hello!! Thank you for your help!! Yes the camera only works when is heat +5 degrees, under this temperature crashes. When I am outdoor and is cold the camera don't works and when I come back to home with normal temperature the camera works again.
I have activated all updates and the system version is:
Model CLT-L29
Compilation number CLT-L29 8.1.0.161(C432)
GPU TURBO
Emui/Android 8.1.0
Kernel version 4.4. 103
[email protected] #1
Mon Oct 22 18:56:42 CST 2018
Thank you in advance and thank you for your reply.
Click to expand...
Click to collapse
You're welcome. I think this phenomenon is very strange. Let me test it.

Question AMOLED Display Overheated; Permanent Damage

Hello,
Have been loving this phone since I got it early this year, around Feb, apart from the battery life.
Unfortunately, recently the display has been cooked (literally) after the phone was overheated while gaming. I'm not sure what happened exactly, but at low brightness settings there is now a very noticeable greenish gradient on the display, more intense closer to where the phone got hotter. There is also an odd black line down the centre of the screen that is only visible on certain parts of the lock screen (notification banners). There is also some noticeable graininess to the screen as well now. Seems fine when brightness is increased.
Has anyone else experienced an issue like this? Unfortunately I will probably be looking to replace the phone soon, as this has made it very frustrating to use in low-light, and I'm not sure whether the severity will increase over time. I doubt there is any fix other than replacing the display unit. Any overheating has probably shortened the already poor battery life as well, unfortunately.
I did try to get an image, but sadly the effects are not very obvious in a photograph.

Make sure you are on the latest firmware and that you are not using the 90Hz refresh rate, it is known to have weird colours/a green tint. Other than that, maybe it did in fact overheat and get damaged, but I think it is unlikely at the temperatures a phone can get to, so probably a defect screen. If you can get it checked by Asus they might replace it

Adaoh said:
Make sure you are on the latest firmware and that you are not using the 90Hz refresh rate, it is known to have weird colours/a green tint. Other than that, maybe it did in fact overheat and get damaged, but I think it is unlikely at the temperatures a phone can get to, so probably a defect screen. If you can get it checked by Asus they might replace it
Click to expand...
Click to collapse
I haven't had the issue prior to the overheating. Phone is always on 60Hz because the battery life is even worse otherwise, so definitely not that.
In fiddling around it looks like the issue only happens when DC dimming is enabled though. Sadly having it off makes the display look like an LCD for anything except pure black, where the pixels turn off.
Unfortunately I probably couldn't get it repaired by Asus (without a fee anyway), as I have the bootloader unlocked and root access, and the unlocker reports the serial # to Asus. I live in Australia and we haven't had right to repair enforced like America has.
I am on latest Android 12 firmware.