Database Users

Why did changing WiFi channels remove my screen flicker?

Hello all,
I am new to both this forum and Android as a Nexus 7 owner. First things first: I've been a semi pro gamer for a few years. (currently a BF3 jet pilot at world rank 20) My vision is extremely sensitive to movement, color and changes in brightness. I can tell you what Hz a crt is running at from a glance and see very easily when any sort of interference is coming into an LCD. I stare at screens a lot. I only state this because I am hyper sensitive to these things as opposed to people who turn on lux and think the problem is gone because the filters make it less visible.
I've owned three Nexus 7s so far. The first one had flicker that was easily visible in Gmaps and Chrome. The second one's accelerometer was grossly defective so it didn't even get screen tests. The third one came off the truck fresh on Friday and when tested (download going, 0 backlight, auto adjust and wifi at 2 bars) in Gmaps it had a slight flicker to it. Almost a pulse more than a full flash. I figured that's as good as these are going to get so I kept it. I applied the tape mod (electrical) and it lessened the duration of the flicker but didn't get rid of it. I had to compensate by adding brightness like everyone does but even then I could see the back light making pulse changes extremely faintly on white screens. I've seen a couple of others here with keen vision who noticed the same thing. It's not like a brightness change but more like a distortion. I'd say most normal folks wouldn't even notice it but for me it was an annoying itch reminding me of the fault. Because of that I tried the suggestion of changing the WiFi channel.
I went from channel 6 (2.437Ghz) to 11 (2.462Ghz) and instantaneously on reconnect the pulse was gone. I began testing again in darkness, zero backlight, auto adjust, large download going, wifi at 1-2 bars and scrolling like a maniac on Gmaps. Result: Absolute zero pulse, flash or distortion... And this is a result confirmed by someone hyper sensitive to any imperfections at all.
I'd like to know why this happens from any of you tech lords here. If flicker is a hardware issue caused by bad soldier as some claim, why would wifi channel remove the issue? As most of you know, channel 6 is default on a lot of US routers and if you travel with the N7 without using hotspot or etc, six will return to cause issues. Is the Ghz jump from .437 to .462 large enough to actually affect hardware to that degree? I ask because it seems to me that this could be something fixed by software updates.
Making the N7 perfect at home where I control the channel is one thing, but on traveling I fear old channel 6 will sneak up on me again. What do you guys think? Might this really be software after all? And if it is, do you think Asus or Google would even take the time to fix it?

I'm not sure really. I have my router set to channel 10 and I had the screen flickering! What fixed it for me was using Lux Dash app, I think it's a problem with the auto. brightness acting up, but not sure.

I had flickering on channel 2, replaced my unit and then had no flickering while still on channel 2.
The common consensus is that flickering happens when you have a weak signal, if you change channels to one that doesn't have any interference, you'll see an improvement.
So I'd assume your flickering potential is still there, you just now have a signal strong enough not to trigger it.

Cryingmoose said:
I had flickering on channel 2, replaced my unit and then had no flickering while still on channel 2.
The common consensus is that flickering happens when you have a weak signal, if you change channels to one that doesn't have any interference, you'll see an improvement.
So I'd assume your flickering potential is still there, you just now have a signal strong enough not to trigger it.
Click to expand...
Click to collapse
Thanks for the reply. The only problem with that idea is that part of the testing I did was dropping the signal purposefully to one bar on the Nexus. So both signals were being extremely weakened. I live in an area where my wifi is the only wireless network in range so would interference be an issue in the first place?
Sent from my Nexus 7 using xda app-developers app

[POLL: Vote 4 Yours] Summary of issues people having with g4

Let's be clear. G4 is an awesome device. But it's still kindof in the pre-production phage, don't you think? It's not even available 10 countries in the world. Anyway many of who have already bought LG G4, are actually migrated from another smartphone branding either HTC, Samsung, Nexus, Apple etc. And the youtubers contributed a lot in this publicity for LG. I hardly found anyone said any bad thing about G4, neither about it's battery life nor performance in those videos or reviews. But these two have become the most concerning area as well as disappointment for many of the users right now. I, myself also have been suffering with a few issues. I have already changed one device. Coming from XDA forum, here I will try my best to summarize all the problems people are facing with their G4 & also my observation on that matter from my personal experience as well as gathered knowledge from almost all the forums in XDA:
1. MISSED TAP:
Almost all users reporting that G4 missing many taps to recognize.
My observation:
Well, I have also experienced a few missed taps. But what I think it's not a LCD issue, rather less optimization/smoothness issue of the G4 ROM. How do I know? Well I switched on the touch sound. And every tap I did, including the missed ones, there was tapping sound. Even I tested in the manual testing, nothing reported like that. And even after formatting, symptoms reduced for some. But surely it's very annoying.
Oh one thing about knock codes, I found LG LCD doesn't response to gentlest touches sometimes. You need to press slightly a bit more. Fact to be considered : I am still using the provided plastic protector.
2. LAGGING ISSUE:
There is stuttering here and there in G4, not only in the stock launcher but also in the whole system.
My observations:
No doubt G4 lags. You will notice less smoothness / sluggishness while sliding any page up & down in chrome, youtube, Google plus or anything. It is not "butter smooth" like some other OEMs for most of the users. But switching to Nova, turning off smart bulletin & dual window helped to some extent, but not completely.
3. BATTERY LIFE:
Many of the moderate to heavy users complaining about quick battery drainage with low to medium brightness.
My observations:
LG said many things about their battery life of G4 in their announcement party and many well-known youtubers also said very much positive things about G4's battery life i.e. it can easily last a day which raised up the expectation bar of many users. But the real scenario is quite not like that. Most of the medium to heavy users are getting average 3 - 4.5 hours SOT with keeping screen brightness low to medium which is not at all the way LG mentioned. It seems like LG is providing that extra battery knowing the fact that you will need to put on that extra one at the middle of the day for sure. Anyway, what I found is: G4's stand-by time is OUTSTANDING. Don't turn on that screen much, only receive a few calls, you can pass a decade (not literally) with a single charge. But turn on that screen, do browse, chat, Facebooking or Youtubing or anything keeping that overkill screen on, you will hardly pass 5 hours maximum. Raise the brightness a bit more, like 75-100%, brother, you are doomed. Your G4 will die within hours. For some, turning off auto brightness & keeping the brightness below 50% all the time, turning off fast-dormency, turning off GPS, using Greenify helped a bit. Anyway, my point is that awesome-bright-vivid-overkill screen is actually the curse for the G4 at present if LG doesn't bring up some solutions for it. What's the point if you can not enjoy the juice of a fruit which is known to be the tastiest of them all???
4. HEATING & SLOW CHARGING ISSUE:
Very limited people including mine are complaining of frequent, not consistent, heating up issue of the phone as well as slow charging.
My observations:
Many factors can be responsible for this. Some people find this scenario happening once a day, for some once in two days and these two issues are interconnected in my opinion. What can heat up the phone? May be some hidden apps, maybe weather, maybe some other things, but surely it does for some. Yah we have seen in all the reviews that G4 warms up a bit, but not very much. But the people who are complaining about it, found it uncomfortable to speak touching the phone to the face. I will attach a screenshot here, in which my phone was completely idle, was on charge, no phone call came & my phone got heat up to 42 degrees & it took almost 5 hours to charge from 20 - 100%. Again I am saying this is not a consistent scenario, but it's frustrating for some including mine.
5. OTHER ISSUES:
These are some random issues found by some people:
a) White sparking light in the screen.
b) Yellow tint on screen.
c) Bad bluetooth audio.
d) Wifi speed problem.
e) Helium app doesn't work properly.
f) Nova launcher cannot install properly.
g) Vibration too soft.
h) Auto brightness inconsistancy.
So guys, if you have read it and if you are one of those renowned youtubers or columnists or bloggers whom LG guys follow on regular basis, please make an article or video about it, spread these information and let the LG guys know about these so that they can do something about it. I personally believe, software update can solve 95% of the issues. So be it.
Thanks for your patience to read my post.

I guess I've been pretty lucky thusfar.
Only missed taps I've had is on the double-tap to wake, but I think it might be due to my hardly tapping it (was used to HTC's touch profile last time I had this feature).
No lags here. I did notice that once, when I hit Home button, I returned to a blank home screen and it took about 5 seconds for the icons/widgets to show up...hasn't happened since the one time, though.
Charging, I use the stock charger from my old Note 4, so I get decent times with that (generally 10%-100% in about 50 mins...I'll take that).
As far as battery, I get about 3 hours screen on and 16-18 hours total per charge. Not bad considering I'm a heavy user when the screen is on and stream Spotify via BT speaker 12 hours/day while at work. I've only been through 3 charge cycles so far. It's still not what I was used to with the M8 or Note 4, so I will admit I'd like it to be better.
I think I would go just about nuts if I had any of 5a, b, c, or d. LOL

5d is a huge concern for me. My WiFi speed is complete bollocks. I'm getting a reading of 60mb down from my 5gh router when running speedtest on the phone. But when I actually load a website it's like I'm using dial up again. The load times are atrocious! I'm going to look into changing chanels on my router as someone has mentioned as a fix. Fingers crossed

I haven't had any of those issues. Honestly been flawless so far. Surprised by how smooth it is. I do only get 3 hours sot if I run power intensive apps. But I think that's normal.

The only real issue I've had is **** slowness on Wi-Fi but blazing speed on data
Sent from my G4 using your mom

Wifi speeds are complete crap for me i swear it's like im on dial up waiting for a page to load and forget about getting youtube to load

Th3Bill said:
I guess I've been pretty lucky thusfar.
Only missed taps I've had is on the double-tap to wake, but I think it might be due to my hardly tapping it (was used to HTC's touch profile last time I had this feature).
No lags here. I did notice that once, when I hit Home button, I returned to a blank home screen and it took about 5 seconds for the icons/widgets to show up...hasn't happened since the one time, though.
Charging, I use the stock charger from my old Note 4, so I get decent times with that (generally 10%-100% in about 50 mins...I'll take that).
As far as battery, I get about 3 hours screen on and 16-18 hours total per charge. Not bad considering I'm a heavy user when the screen is on and stream Spotify via BT speaker 12 hours/day while at work. I've only been through 3 charge cycles so far. It's still not what I was used to with the M8 or Note 4, so I will admit I'd like it to be better.
I think I would go just about nuts if I had any of 5a, b, c, or d. LOL
Click to expand...
Click to collapse
Same here. Not sure why there is so much inconsistency between devices. I bought the US trial version, and mine has been relatively good. If I had half of the problems reported I would have sold this thing ASAP and waited for a better crop of devices to come out this fall. I'm one of the few people who really like a stripped down TouchWiz, but with Knox/sealed but not waterproof body/no SD/weak battery the S6 wasn't cutting it. If only Samsung sold the Exynos to these other vendors... For now, I'm fine with the G4, but really hope we get root and unlocked BL so development explodes and the kernel can get tweaked.

Only problem I've had is holding back my enthusiasm about how flawless this phone is ( my wife would try to hijack it if she knew how impressed I am). I do miss 4 buttons on the bottom though

knoshann said:
Only problem I've had is holding back my enthusiasm about how flawless this phone is ( my wife would try to hijack it if she knew how impressed I am). I do miss 4 buttons on the bottom though
Click to expand...
Click to collapse
You can add the 4th button. You can add up to 5. Settings - Display - Home touch buttons - Button combination

Perfect summary.
I've also seen a lot of people saying that they aren't having these problems which can lead to people thinking the phone is perfect, which it's not. I love the screen size and the display but the software is really letting this phone down.
I've experienced many problems too, such as: stuttering, poor battery life at high brightness, brightness dimming down by itself, slow charging, lag and stutter in games, e.g. dead trigger 2 and subway surfers (yes I've turned off game optimiser) and the notification pull down freezing frequently when I get a notification. However, as I saw a lot of people saying that their phones were perfect I chose to exchange my phone instead of return it. My new phone has the exact same problems (uk device on v10a).
Maybe these problems can be fixed with a software update but the question is will it? My G3 lagged and stuttered from the beginning and no software update changed that. The only fix was to switch to a cm12 rom which made the phone finally perform smoothly, at the cost of battery life and camera quality.
It's been at least 3 phones in a row now that have had poor software (g3, g flex 2 and now g4). They're supposed to test their phones before putting them out to consumers but it doesn't seem like they really care so I don't have much hope.
Worst thing is I really want to love this phone and think LG's hardware design is perfect but the software is most likely going to make me sell it.

It might be worth mentioning which version you're on, especially if it's one where the provider (such as VZW) has bogged it down with bloatware. That could conceivably be a contributing factor to battery life issues, if nothing else.

Just a suggestion. Might be a good idea for people to put which model they're on and which Software version they're running.
Like I'm on the H811 running version 81110D. That way, we can see if any issues might be carrier type or software version based...
Just a thought.

Not sure if anyone has mentioned it yet, but on the Sprint model the WiFi randomly turns itself on. I rarely use WiFi, so it's definitely not me turning it on and forgetting that i did or anything.

I was having a issue where my screen Brightness would change on it's own. Tmobile H811 running version 81110D ? I believe that was the version before the update I got and installed on its own last night of H. When I mean change on it's own I had the Screen Brightness on 100% like every other phone and after the few secs when the screen dims and you touch it again the screen brightness would now be set to 70% now 100%. AUTO is off I don't use that.
I will see if this happens on the H update or not.

Ogre6473 said:
Not sure if anyone has mentioned it yet, but on the Sprint model the WiFi randomly turns itself on. I rarely use WiFi, so it's definitely not me turning it on and forgetting that i did or anything.
Click to expand...
Click to collapse
I've actually seen this on the TMO version (8110d). Very sporadic (or it happens more than I realize but I don't spend enough time looking at the phone to notice, not sure which).
I've also seen it randomly turn OFF wifi (just happened 30 seconds ago) for no reason. Interestingly enough THAT one might be oddly due to some weird power saving feature or something as I was just able to reproduce it 3 times in a row turning the screen off and on.
Screen on=wifi on
Screen off=wifi off
Weird stuff.

smw6180 said:
I've actually seen this on the TMO version (8110d). Very sporadic (or it happens more than I realize but I don't spend enough time looking at the phone to notice, not sure which).
I've also seen it randomly turn OFF wifi (just happened 30 seconds ago) for no reason. Interestingly enough THAT one might be oddly due to some weird power saving feature or something as I was just able to reproduce it 3 times in a row turning the screen off and on.
Screen on=wifi on
Screen off=wifi off
Weird stuff.
Click to expand...
Click to collapse
Go into Wi-Fi Settings.
Under Advanced Wifi Settings
In Useful Settings, there is a setting for "Keep Wi-Fi on when screen is off".
It's set to NO by default.
I would imagine it's some sort of power saving feature.

smw6180 said:
I've also seen it randomly turn OFF wifi (just happened 30 seconds ago) for no reason. Interestingly enough THAT one might be oddly due to some weird power saving feature or something as I was just able to reproduce it 3 times in a row turning the screen off and on.
Screen on=wifi on
Screen off=wifi off
Weird stuff.
Click to expand...
Click to collapse
In setting, wifi, advanced there is an option for turning off wifi when the screen is off. Check that and wifi will stay on. Still haven't digured out why it's turning itself on though.

Ogre6473 said:
In setting, wifi, advanced there is an option for turning off wifi when the screen is off. Check that and wifi will stay on. Still haven't digured out why it's turning itself on though.
Click to expand...
Click to collapse
I haven't touched anything in Wi-Fi settings other than setting my passkey and turning "Always allow scanning" off. That setting for Wi-Fi off when screen is off was on when I got the phone. Looks like default position.

It probably doesn't help that they keep losing software engineers at their California office (i work at LG). Senior engineers to make things worse.

The yellow tint on the screen is the part that upsets me the most. The lead-up to the G4's release was all about how superior the screen is to the G3's. Yet the G4's I've received have had yellow tint issue (two of them so far). The screen also appears dimmer than my old G3 at max brightness as well (this is before auto dimming kicks in too.)
There seems to be a rather big shipment of G4's with yellow screens in my area. I've been to 4 different AT&T stores in the past 4 days and have seen at least 5 brand new phones with the yellow tint. It seems to be restricted to the grey metallic retail ones as well. None of the display models or the leather backed ones I've seen thus far as the yellow tint issue. This is in Houston, TX btw. I'm heading to a 5th after work in the hopes of finding a G4 with a non-defective screen.

WIFI LATENCY ISSUE After the B08L update

Has any one noticed the latency of the WiFi radio after the update,
i sent back my first 6P because i figured it was a bad radio.
Negative it was the update
Test for it by doing this:
Launch play store with with the Cell Radio turned off, and watch the load time on the icons for everything, under NORMAL operation they should be bullet fast and when you scroll to unloaded apps it should "almost instantly propagate"
IF it takes more than 2 seconds obviously you are having the problem as well.
Try this in reverse with the Cell on and WIFI off. On cell it will be bullet fast
I dont know why no one has found this bug yet

I think they M build fixes something with wifi but don't hold me to that 100% I remember reading it somewhere if I remember correctly.
Sent from my Nexus 6P using Tapatalk

NOPE still sluggish.
bet you 5 bucks you extract the radios from 89d and it works like a mutha fuhhuhhh

Weldzor said:
Has any one noticed the latency of the WiFi radio after the update,
i sent back my first 6P because i figured it was a bad radio.
Negative it was the update
Test for it by doing this:
Launch play store with with the Cell Radio turned off, and watch the load time on the icons for everything, under NORMAL operation they should be bullet fast and when you scroll to unloaded apps it should "almost instantly propagate"
IF it takes more than 2 seconds obviously you are having the problem as well.
Try this in reverse with the Cell on and WIFI off. On cell it will be bullet fast
I dont know why no one has found this bug yet
Click to expand...
Click to collapse
I don't notice any latency with the Play Store, it loads in a couple of seconds, and I have a pretty slow internet connection. I experience some pretty bad issues with Chrome though, it won't load pages at all sometimes, I mainly experience this on XDA (in saying that though my Chrome usage is 99% XDA).

Still Latent as all hell, i counted a good 20 seconds before it started to download the speedtest.net app. this is really starting to piss me off

Mine doesn't seem to have any latency but my WiFi DL speeds sit around 170-200mbs with my AC5300 router. I don't have any issues on slower networks either running the M build.

im going to flash the first factory image and see if that does it
ill report back

I had this issue and it was super frustrating. The Play Store wouldn't even load unless I switched it to LTE.
Turns out 6.0.1 fixes it!

Common issues and how to test for them?

Off the top of your head, what are some issues that are common with the Axon 7 and how can one test for these issues? I just ordered a new Axon 7 and I want to be sure to check for all issues before my 30 day return window ends. So far I know about signal strength issues, WiFi connectivity issues, slow charging issues and battery life issues.

Issues I have had (on two different Axon 7 devices):
1. microphone does not work at the start of a phone call, until you turn speakerphone on and off.
2. Videos you record (in just 4k on the first phone, but in all resolutions on the second one), have a clicking noise in the background, even in a very quiet room, even in different locations. It's some internal sound the phone generates and is present in recorded videos. I just checked, and it's also there on recorded audio. Basically, this phone has great speakers and total junk for microphones.

7th1rt3en said:
Off the top of your head, what are some issues that are common with the Axon 7 and how can ones test for these issues? I just ordered a new Axon 7 and I want to be sure to check for all issues before my 30 day return window ends. So far I know about signal strength issues, WiFi connectivity issues, slow charging issues and battery life issues.
Click to expand...
Click to collapse
OIS, use the camera while moving the device a bit. If it does weird noises then return it

The capacitive buttons can be hard to trigger - they have a small hit box. Once I turned on "vibrate on touch" I was able to use them a lot better. Some people complain that they don't work at all though.
Android Pay might not work - you could get an error like:
Android Pay can't be used on this device. This may be because your device is rooted, has an unlocked bootloader, or is running a custom ROM. As a result, Google can't confirm that your device meets Android Pay's security standards.
I'm in the process of trying to update to the latest system version to see if that resolves the issue.

So far I have only tested for the OIS problem and the ticking in recorded video. No problem with OIS but it DOES have an occasional tick sound in recorded video. I suspect that this is the case with virtually all A7s and not worth doing an RMA over. Luckily it's not too bad and I never record video anyway.

trapezoidalrutebega said:
Android Pay might not work - you could get an error like:
Android Pay can't be used on this device. This may be because your device is rooted, has an unlocked bootloader, or is running a custom ROM. As a result, Google can't confirm that your device meets Android Pay's security standards.
I'm in the process of trying to update to the latest system version to see if that resolves the issue.
Click to expand...
Click to collapse
I was able to resolve the android pay issue by doing an sdcard update to bring my phone to the most current version - B25. Here's a link to the thread: https://forum.xda-developers.com/axon-7/help/stuck-a2017uv1-0-0b17-sd-card-update-to-t3624389

The reception results from my app have bee very odd, it's either -1 dbm or around -100 using network monitor at my house. Obviously this reading is erroneous. When I look at the KLWP live reading it tends to stay just below 100. I have 5 bars but -100 signal, it does make me think that they fudged the signal strength indicator to give a better impression. To be fair, my previous phone was consistently around -97 so the difference is minor, but at least it gave an indication that reception was low. The old phone also had the excuse of not picking up band 12 (T-Mobile). Time to witch providers for sure. I don't guess there are any ways to improve this? Oh, I also only received the N 7.1.1 B15, not sure what I can do about that.

7th1rt3en said:
The reception results from my app have bee very odd, it's either -1 dbm or around -100 using network monitor at my house. Obviously this reading is erroneous. When I look at the KLWP live reading it tends to stay just below 100. I have 5 bars but -100 signal, it does make me think that they fudged the signal strength indicator to give a better impression. To be fair, my previous phone was consistently around -97 so the difference is minor, but at least it gave an indication that reception was low. The old phone also had the excuse of not picking up band 12 (T-Mobile). Time to witch providers for sure. I don't guess there are any ways to improve this? Oh, I also only received the N 7.1.1 B15, not sure what I can do about that.
Click to expand...
Click to collapse
It's not like an RMA will magically fix the signal strength issue so that's not really something you should focus on. I usually get 70% LTE coverage on a daily 30km trip in the almost 3rd world country that I live in anyways...
To update, you have to download the official ZIP from the ZTE support page (search "zte usa support" on Google, select the axon 7 unlocked), download it, unzip it if there's another zip inside, put the zip on the root of the internal storage of your phone, go to settings --> Updates

Problems I have with my Huawei P8 Lite

1. Battery
2. Sometimes when typing outputs two letters when pressed once so I have to resort to swipe typing which is unreliable...
3. Can't connect with Bluetooth to many items. For example, when connecting to my PS4 controller it says can't connect because of incorrect pin...
4. Sometimes when WiFi and Bluetooth is on, both may disconnect and bug.
5. Temperature can be high at times.
List may go on but I have had this phone for about 7 months and it hasn't been delivering...
Also, you really can't screen record on this phone...
Which really sucks cause Snapchat filters records your screen xD so you won't get that far with Snapchat.

1.Battery problems are common for this device so you have to deal with it.
2.I do not remember such error. I am using gboard and it's all fine..mostly. It lags sometimes if you switch between apps very often but it's also something you have to deal with because of the hardware..not for heavy multitasking.
3.No ideea about that, maybe there are some more steps to follow and it will work somehow.
4.Also known as a bug on EMUI, if both enabled, issues might occur.
5.That is useful since the winter season is coming lol.
Screen recording was working fine on mine.
I had 2 years with the P8Lite and it got me more into Huawei because it offered me a lot for it's price. Of course, aint a perfect phone nor a phone with high expectations but it's more than a decent phone.
Right now I'm using a P10 and it's a huge difference in terms of performace/design/screen..most of the aspects but even with that..P8Lite was a great experience for me.

Yeah I just think I got served a broken phone? Coz I've been browsing the internet and no one has been going through my problems... Well maybe I might grab a new phone lol coz I love this phone and I Kno my expectations are better, as you mentioned that these problems didn't occur with your phone I think I did indeed get served a broken p8lite... Thanks for your information btw..?