hey,
i've done several searches and cannot find any threads on a fault i'm having.
http://www.youtube.com/watch?v=RSL1-Bsy5pI
Vid of completely stock nexus 7 not rooted exhibiting ambient light sensor/backlight issue. Screen dims beyond point where screen is visible when auto brightness is used or level is adjusted below 40%
UPDATE 11/10/13
ASUS are a joke. Tried to have it repaired as a manufacturing fault. They weren't having it as 6 months out of warranty. And there's rubbish 3rd repair centre TRIAGE SERVICES LTD claimed it needed a new main board as it was a light sensor fault at the cost of £207.06 (i could buy the new 2013 nexus 7 cheaper). I told them where to go with that and asked for my tablet back which cost me £35.
I bought a replacement board and fitted using the amazing guides on IFIXIT.COM
And guess what? same issue
2 possibilities here either replacement board has exact same fault (unlikely) or fault is else where (LCD assembly)
There is no way i've found that you can calibrate the screen using the tablet, not sure about other methods
I may try a new screen
UPDATE
Spoke to TRIAGE SERVICES LTD again shortly after changing the board and after a lot of longwindedness they say they have a way of reseting the screen although it not guaranteed to work and will cost £50 if it does or £35 to return if it doesn't. (why they did not try this when they had the tab is beyond me). I'm relecutant to send to them as every search i've tried to reset the defualts on the light sensor show nothing.
Now i know on the samsung you can get into a hardware test mode by dialing *#0*# wanted to know if there was a similar mode on the nexus 7. At least that would let me confirm and reset the values for the light sensor.
also when shining the LED flash on the sensor at close range when on auto brightness the screen does auto brighten.
Can anyone help me diagnose this further other than just changing the screen? i knew there are a few people with this fault
UPDATE I have tested a few hardware tester apps on the tab and they all show the light sensor to be operational and responding very well to light changes.
I'm wondering if there is some kind of CMOS in the display assembly or failing that the display driver are fooked.
When android is updated are the drivers also?
Does factory reset include drivers also?
Will flashing the rom via fastboot reset the drivers?
any help is greatly appreciated
Related
I purchased mine from someone who brought several new machines from England. I don't have a warrenty because i didn't purchase it directly and besides i already flashed my rom ages ago with JJ rom instead the O2 one as well already disassemled my machine.
My Exec has the same desease I read many have: Rotating the screen to mini laptop mode being white screen while PDA portait mode is fine.
I disassmbled my machine but apparently there is nothing I can do because the ribbon connecting the LCD to the main unit is ducked up and needs to be replaced.. Probably very cheap and easy to fix if you have that ribbon of course.
I am really pissed off because I don't have that machine in my country and I don't ducking know what to do. Withot the keyvoard my machine is useless. My girlfriend is going to Germany, Munich, Byrn next month and I was thinking maybe there is some kind of hope to get it fixed there on the spot (she's going for only a week).
Or maybe a private lab or something that I can send the machine to, to have it fixed. Right now I'm in Turkey.
Thanks
: please don't swear so much. Keep it respectful!
join the club buddy..i have the same problem..mine happened weird so i thin its a virus
You might be better off using Pocket PC Techs: http://www.pocketpctechs.com/main.asp?unit=HTC_Universal-439&area=repairs
Well guess what, everybody who has the white screen in minilaptop mode, its not a hardware problem. I took mine for repairs and the screen caBLE is fine. The tech opened the device and checked everything. He colcluded it has to be a software issue. I therefore need o2's original rom and do a complete rom flah..maybe low level???
jlforlife said:
Well guess what, everybody who has the white screen in minilaptop mode, its not a hardware problem. I took mine for repairs and the screen caBLE is fine. The tech opened the device and checked everything. He colcluded it has to be a software issue. I therefore need o2's original rom and do a complete rom flah..maybe low level???
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Click to collapse
I have to disagree here.. It is ** NOT ** a software issue and that is 100% guarantee I give you. Here's why:
I disassembled my machine.
When the LCD side is disassembled and still connected to battery power I flipped the screen while it is COMPLETE OUT OF THE AXIS this means that the hardware switch that makes the software flip the screen is not connected. I.E. in a normal operation if you flip the screen that way, it would still be considered portrait mode. as there is no detection to know the status of the screen mode (if minilaptop or pda portrait)
The screen turned white.
It is confirmed to be a hardware problem. I also read another message from someone here who had the same problem and got it fixed, apparently just what I thought: The LCD ribbon got a damaged. IT appears flipping the screen many times just 'smashes' the ribbon and teared one or more of the little miniature cables. creating a slightely bad connection whenin minilaptop mode but a good connection while still in portrait mode.
Now MAYBE there is another white screen problem that I'm not aware of. But the one I have and the one the other guy here had are guarateed hardware issue (bad lcd cable ribbon)
yeah, you probable right. Im going to have to sell mine for nothing :evil:
In my A3, the screen flickers when the brightness is low. It goes away if I increase brightness. Didn't drop or do anything to phone.
Exact same problem here. I came across this post when I did a Google search to see if anyone else had the problem and it seems to be an issue that effects numerous Samsung phones, not just the A3. It also seems to be a software issue rather than an actual problem with the screen. I haven't tried this myself yet but I read that if you lower the brightness as low as you can before the screen flicker starts and then download the app screen filter and turn down the brightness further using screen filter rather than the built in control you don't get the flickering which would definitely suggest a software issue rather than hardware, particularly with multiple different Samsung models being effected. It's only really an issue for me when I get to below 5% battery and the screen automatically dims otherwise I never see it happening, it was only after reading your post that I even found I could cause it to happen by lowering the brightness. If you're someone who likes to use the very low brightness then maybe the screen filter thing would be a good workaround for you until the software issue is fixed by samsung, if they ever give us Marshmallow.
My lower half of my Samsung Galaxy A3 flickers on a low light. I read that you have to shut the phone down, take the battery out and leave it awhile before putting the battery in and starting the phone again . However, battery doesn't come out of the phone and my screen doesn't flicker on full brightness either.
Its not solved that way. I took it to Samsung and they replaced the screen now everything it good
Go to developer settings and turn on " Disable hardware overlays" . This will force GPU for screen composting.
This is a common Samsung problem, not just A3. Hardware problem. My phone is knoxed so I'm not sure I'm gonna bother contacting my operator.
Knox isn't a problem. i was rooted and had custom recovery installed yet service centre replaced the display.
As mentioned by OP, the issue is caused by a layer of the AMOLED is bent (due to pressure while in pocket or other reasons).
That is the thinnest and most bendable part of an AMOLED screen.
Only fix is replacing the screen.
Source : A Samsung Employee at the service center when my sister's J7 had this issue and we sent it there.
It's not working .... :/abhijith.prakash
Hi. I just wanna share it. I found in this (xda comment post by some one I forget him for awhile looking for him to say thanks very much) fix for my s5 g900f with latest modem and bootloader. I use RR 7.1.2 rom.
The app is "active screen filter". That save my life.
Hello guys,
I've had the Samsung S7 Edge since august, have always cared for it (i.e. never dropped it, etc.) when all of a sudden, while I was playing Sky Force Reloaded and charging (with fast charge) when I closed the game and turned the screen off, and back on, it was crazy. The image would be flashing white and this flashing changed with the luminosity (when was full luminosity was fine). I also had AOD, and there were no problems there, the screen worked fine. This was until I restarted the phone (though it was a software problem). After the reboot the problem got worse, and I could notice different brightnesses on different parts of the screen, when I could stabilize the image, using full luminosity (and having the setting fixed. As soon as I clicked automatic brightness, It would go mad even with full luminosity).
Having the phone for such a short time, I went to the samsung responsible repair place in my city (there is no official samsung here), because they work with samsung and evaluate the warranty and fix if the defect is on them.
Well, they told me the screen was broken (there was not a single scratch on the outside, which means that only the internal LCD broke somehow), and told me It was misuse.
My question is... How is it possible to break the internal lcd without a fall, without a scratch on the outside and having it to work on some software settings? Because I don't trust this repair shop, or their technicians (they have several bad reviews involving screen defects... they always assume broken screen), and the screen replacement is not really cheap.
Thanks in advance.
I had a similar issue with mine. It was a pink line across the screen from top to bottom. I contacted Samsung via the Samsung+ app and they had me send the phone to them and they replaced the screen free of charge.
Hardware faults can happen at any time, no matter if you drop stuff or not.
Does your screen flash also in Download Mode? AOD display?
Anyway, your responsible repair place is a sh*thole... "misuse" lol.
If you're not rooted Samsung will give you a warranty repair, at least here they'd do it here at my local Samsung repair center.
Hi people,
Im sure most are aware of the flicker in j7 2015 model. I have both j7 2015 and j7 2016.
It was last year when j7 2015 got marshmallow update. Within few hours, the backlit went crazy. It was impossible to dim the screen without seeing all disco pink lines.
There were claims that it was fixed but i still have this issue. Samsung service centre said no display available and warranty period got over this way.
Now just a few minutes earlier, i faced the same isssue in my j7 2016 model. The screen became dim all of a sudden. On closer inspection i found every alternate pixel line was missing vertically. It tried to turn off and on the screen a few times. Then the issue became severe and i was seeing all pink screen. I could barely see the text on the screen.
I had ampere installed and saw that the phone was using over 970 ma of current. So i switched it off and tried after 5 minutes and nothing changed. Twrp, offline charging and holding power button with battery out didnt work either.
I kept on increasing and decreasing the brightness to max and min. Some times the flicker stopped briefly and i could see perfectly. After about 30 minutes of struggling the screen became normal automatically.
I started typing this story when the screen got back normal and it hasn't done wierd flicker till now.
If you face any issue like this, please share over here.
Im also sharing this with samsung so they may or may not try to investigate. They are leading manufacturer of oled display and although the display is fine, im sure their driver circuit have some flaw.
Screenshots , the white one is for low brightness. It goes reddish when brightness is high
I managed to fix the screen by replacing the capacitor array used in the screen.
I did some research and found the 20khz PWM singal used for the screen was out of sync. There is a clock pulse that is controlled by small capacitors to keep it a square wave instead of sinusoidal.
Wont talk more about what and how that works, its there on the internet, just google pwm brightness control circuit.
The capacitor used are either cheap or not within specification or maybe even completely of wrong values.
PS. I know how to handle hardware and soldering, make sure you know what you are against.
Before and after screens. Although i got some scratches on the touch panel, i saved a few bucks in my wallet
Used root dim tool along with team viewer to handle this.
Since i dont have a technical specification for this circuit, ill be doing some more research to fix it properly.
Wow!!!
Sent from my SM-J700F using Tapatalk
dodo2244 said:
Wow!!!
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I need some help with this. I need a broken lcd from j7 2016 model to grab the capacitors. If anyone could help me, that would be great
I recently replaced the screen on my K20 Pro and I noticed that there are a few malfunctions. Screen brightness suddenly goes max for a few seconds when using opening the phone from lock screen and usually when using fingerprint to unlock (I have my Auto-Brightness set to off). Ghost touches when tapping but none when swiping. I was wondering if this is a common malfunction after replacing the screen (calibration or something) or did the installation of the screen went wrong or is it because the LCD used to replace the original one was defective. Thanks for the insights.
i just replaced my screen four days ago and so far i got no problems of some sort..
so, i think it's probably the installation or the unit's fault. idk tho
I'm just annoyed by the sudden screen brightness max. To be honest I think the ghost touch thing is because of a defect LCD, but I think the brightness problem is from the system. It's like the phone does not recognize or remember the previously set brightness. I hope there's a solution for this. Do factory resetting the phone solve any brightness problems?
hello! did you managed to solve this problem? I have the same problem
if you removed foil and it still touch in random parts of screen,. then send it back. i had the same symptoms with a few screens that I repaired. just Chinese quality
yaro666 said:
if you removed foil and it still touch in random parts of screen,. then send it back. i had the same symptoms with a few screens that I repaired. just Chinese quality
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i did the replacement with not 100% compatible display...because it was way cheaper than the display I needed...(from an oppo phone) i know it sounds weird but the display was 200 dollars( the 100% compatible from oppo) and i payed like 70 for this display that flickers the bringtness..but they told me a factory reset can solve it?
what do you think?
try, but I doubt it. looks like fauly/not compatible to me.
try flashing latest miui to make sure you did everything to get it to work, if that doesn't make it better just don't waste your time. if you have more technical data on both anoled and lcd with connections described (every pin) then you could make research a d bypass if needed. otherwise send it back
vincedrian said:
I recently replaced the screen on my K20 Pro and I noticed that there are a few malfunctions. Screen brightness suddenly goes max for a few seconds when using opening the phone from lock screen and usually when using fingerprint to unlock (I have my Auto-Brightness set to off). Ghost touches when tapping but none when swiping. I was wondering if this is a common malfunction after replacing the screen (calibration or something) or did the installation of the screen went wrong or is it because the LCD used to replace the original one was defective. Thanks for the insights.
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managed to solve? I have the same problem, besides sometimes the screen seems to lose sensitivity, I saw in some groups people recommend buying parts from the dragon-tt store....I'm thinking of taking a chance....