Hello,
my Samsung Galaxy S4 has a green vertical 1 pixel wide stripe all over the screen since 3 days. I already reset it and it is definitely hardware related. Is there a possibility to deactivate the faulty pixels in the rom or kernel? I mean at some point there must be code that receives a pixel position and color and then activates the transistor int the TFT with a voltage. Does anybody know where I have to look? I guess anything that has to do with the LCD control. :good:
Related
Hey folks,
I got my S2 back today and had the display replaced from an official samsung service company.
After installing CM7 it feels that the display is way darker than the original one.
Could it be that they put in a non-super amoled plus display? Is there any way to theck via software what the display type is?
thanks
boba
super amoled screens have a lot of variation. Color temperature, whitepoint, brightness curves, etc. It's nothing to worry about. An SLCD screen would be significantly brighter anyway.
did this happen only after you flashed CM7?
Hey quick Q, i bought a S3 on Wednesday, just noticed that when the screen is green ( or when browsing 0 brightness) that there is a faint whitish pixel that always shows up. Its not visible on black screens, red, purple, or blue.
Anything i can do? Or should i not even bother as its only 1 and how often does the screen go green.
There is no such thing as stuck pixels on AMOLED screens, only defective (either always-on or always-off) pixels or lazy pixels.
While it may sound stupid when related to what I just said, try the app 'Dead Pixel Detect and Fix' and let it run for half an hour.
It will cycle the colors very fast. It will most probably not work but it's worth a try.
If it still appears, try taking it back. Defective screens on a new 600$-handset is not very nice.
ah i see, but can you explain to me why it does not show up on a black screen/background? I just find it interesting and would like to know the reason behind it.
cruisx said:
ah i see, but can you explain to me why it does not show up on a black screen/background? I just find it interesting and would like to know the reason behind it.
Click to expand...
Click to collapse
If it bothers you, just take it back to where you got it from and get it either fixed or see if they can give you a new one.
LCD screens use a white backlight illuminating the whole screen from behind. White includes all visible colors from near-infrared to near-ultraviolet.
To create the different colors they use crystals which are rotated by a power source in the correct angle that only a certain color (e.g. blue) is visible.
LED-Screens [*] and their derivates such as OLED get rid of the backlight and instead of using crystalls, replace each dot with a ligh-emitting diod (LED) which by itself gives light. However LED's have a big deficit; they can only produce one single exact color. So, similar as with the old CRT screens, LED's use multiple colors per pixel [**], these are the RGB colors (Red Green Blue). So each pixel is made up of multiple so-called sub-pixels.
If all 3 are lighted, they mix together to white, any combination in intensity (from 'off' to 'full brightness') gives you millions and millions of colors to display.
(It's easiest to see on large-scale LED televisions, just move very close and you see the 3 tiny 'lamps')
Now your particular issue is that a certain, due to one of several possible issues is not powered off or connected incorrectly; it is lightened at the wrong time.
So the reason it only shows at certain combinations is, that at other combinations you cannot see it due to the difference in color being too marginal or the other LED's also being off.
While it's unnerving, these issues keep arising during production. One has to keep in mind that one such small screen is made up out of thousands of individual light sources which can each be triggered individually to form millions of different colors.
Usually quality-control should get rid of such screens, but sometimes one slips through. I'm not sure what Samsung's standard for the S3 in regard to maximum defective pixels per inch or unit is, but you can (and should) always try to get it replaced.
[*] A lot of cheapskates sell LED televisions where in fact a normal LCD panel is built-in but they refer to the backlight source which in their case (and most other current productions) in fact is an LED source. It has nothing but the name in common.
[**]
This is not entirely true since structures such as active-matrix OLED (AMOLED) share LED's between pixels to cram a higher pixel densitiy in the same physical size.
d4fseeker said:
LCD screens use a white backlight illuminating the whole screen from behind. White includes all visible colors from near-infrared to near-ultraviolet.
To create the different colors they use crystals which are rotated by a power source in the correct angle that only a certain color (e.g. blue) is visible.
LED-Screens [*] and their derivates such as OLED get rid of the backlight and instead of using crystalls, replace each dot with a ligh-emitting diod (LED) which by itself gives light. However LED's have a big deficit; they can only produce one single exact color. So, similar as with the old CRT screens, LED's use multiple colors per pixel [**], these are the RGB colors (Red Green Blue). So each pixel is made up of multiple so-called sub-pixels.
If all 3 are lighted, they mix together to white, any combination in intensity (from 'off' to 'full brightness') gives you millions and millions of colors to display.
(It's easiest to see on large-scale LED televisions, just move very close and you see the 3 tiny 'lamps')
Now your particular issue is that a certain, due to one of several possible issues is not powered off or connected incorrectly; it is lightened at the wrong time.
So the reason it only shows at certain combinations is, that at other combinations you cannot see it due to the difference in color being too marginal or the other LED's also being off.
While it's unnerving, these issues keep arising during production. One has to keep in mind that one such small screen is made up out of thousands of individual light sources which can each be triggered individually to form millions of different colors.
Usually quality-control should get rid of such screens, but sometimes one slips through. I'm not sure what Samsung's standard for the S3 in regard to maximum defective pixels per inch or unit is, but you can (and should) always try to get it replaced.
[*] A lot of cheapskates sell LED televisions where in fact a normal LCD panel is built-in but they refer to the backlight source which in their case (and most other current productions) in fact is an LED source. It has nothing but the name in common.
[**]
This is not entirely true since structures such as active-matrix OLED (AMOLED) share LED's between pixels to cram a higher pixel densitiy in the same physical size.
Click to expand...
Click to collapse
yes
Here are some photos of Nexus 10 with backcover removed, you can see the screen is fused inside a frame along with digitiser and gorilla glass, the screws you see is for holding the battery and have no effect on the extent of light bleed.
awesome pictures!
Hm.. Have you tried to turn on the tablet with open cover just to see of the light bleed is still there ?
So I wonder...does it just all snap together during the manufacturing process? If the only screws are for the battery then what is holding the screen assembly to the frame? I hope its not the frame itself causing all the problems...that could take Samsung while to fix if at all :/
davidmclaren said:
Hm.. Have you tried to turn on the tablet with open cover just to see of the light bleed is still there ?
Click to expand...
Click to collapse
still there
atg284 said:
So I wonder...does it just all snap together during the manufacturing process? If the only screws are for the battery then what is holding the screen assembly to the frame? I hope its not the frame itself causing all the problems...that could take Samsung while to fix if at all :/
Click to expand...
Click to collapse
i guess they are glued together
great photos
have you tried to press at some points to see if the lightbleed changes?
after some speculation i think the backlight on the N10s is set to high
i know that my old Samsung TV looked terrible when using max backlight.
as i dont have any N10 yet (picking it up on friday) im not sure if the brightness slider changes the backlight or the brightness(black level)?
my teory is that the backlight is set at max all the time and you only change the brightness.
thats plain WRONG!
thats why colors looks washed out when increasing the brightness
what you want is also a slider for the backlight
the brightness(black level) should ALLWAYS be the same
if you want a brighter display you should only change the backlight as the backlight doesnt affect colors/black level or gamma.
backlight only increase the white level.
you dont want to change your gamma right?
so hackers and kernel experts
find a way to change the backlight and most of the problems should be gone
i think
also you need to replace or add a slider with backlight setting instead of the brightness slider
I
263629749 said:
i guess they are glued together
Click to expand...
Click to collapse
I suspect a thin strip of double sided foam tape. Glue aren't typically used on screens as they create fumes which can haze the screen. Atleast not when we install touchscreens for ATM machines. Double sided tapes are easier to apply also. Same process as screen protectors where you have 3 layers with the center being the actual film. In this case center is the double sided tape. Peel one side, put it on the screen then peel off the other side to expose the other sticky side then lay the screen down on the glass. When its not on perfectly is when I suspect light bleed happens.
The huge problem is trying to remove it once its on. You can use heat to try to separate them. With ATM screens they're thicker so somewhat easier to pull them apart as you heat them but with newer phones or tablets they're so thin that if you do this they'll easily crack.
IMO if the light bleed is bugging you just exchange it rather than risk cracking the screen. Then you'll end up completely voiding your warranty exchange
Sent from my SGH-T999 using Tapatalk 2
Here's a complete tear down. There's no mention of any sketchiness in the way it's put together or components used.
Today we received and promptly disassembled the Google Nexus 10. In usual fashion we’ll release the take apart video next week, but wanted to go ahead and post the preliminary take apart steps and photos. The model we’ve taken apart is the 16GB Wi-FI model. Model # GT-P8110.
One thing that struck us about this disassembly was the complete ease of taking this tablet apart. Whereas Apple seems to be making it more and more difficult to repair devices by combining parts and using as much glue as possible, Google seems to be taking the complete opposite approach. The end result is a device that is extremely repairable. Go Google!
Another interesting note is how many of the components in the device are manufactured by Samsung. It appears that the battery, processor, and flash memory are all made by Samsung. Is this Google’s way of capitalizing on the drift between Apple and Samsung?
That’s it. The Nexus 10 display and digitizer are fused together, so that is where the take apart ends.
http://www.powerbookmedic.com/wordpress/2012/11/16/google-nexus-10-take-apart-first-look
that cable that says "GT-P8110" is very interesting. Might help with Samsung support reps in trying to identify what the device is
http://www.samsung.com/us/support/owners/product/GT-P8110HAEXAR
Edit: Hmm, just looked at my N10 box and it has the number as well; not sure how I missed that before.
pg_ice said:
great photos
have you tried to press at some points to see if the lightbleed changes?
after some speculation i think the backlight on the N10s is set to high
i know that my old Samsung TV looked terrible when using max backlight.
as i dont have any N10 yet (picking it up on friday) im not sure if the brightness slider changes the backlight or the brightness(black level)?
my teory is that the backlight is set at max all the time and you only change the brightness.
thats plain WRONG!
thats why colors looks washed out when increasing the brightness
what you want is also a slider for the backlight
the brightness(black level) should ALLWAYS be the same
if you want a brighter display you should only change the backlight as the backlight doesnt affect colors/black level or gamma.
backlight only increase the white level.
you dont want to change your gamma right?
so hackers and kernel experts
find a way to change the backlight and most of the problems should be gone
i think
also you need to replace or add a slider with backlight setting instead of the brightness slider
Click to expand...
Click to collapse
its usually the back light led whose brightness is changed thats y u save battery life when u reduce brightness, what ur talking about is the contrast and thats fixed on the tablet, brightness being led light intensity and contrast being each pixel allowing amount of light through it
ok time to get this tablet perfect
i have some slight lightbleed at the bottom right corner as many has.
if i press at the back of the screen at the right corner i can clearly see that the lightbleed gets worse.
so the conclusion is that is has something to do with uneven pressure at the screen when you can affect it with pressure from the back.
i report back how it went and if i found some solution
A little bit off topic here, in regards to thermal throttling, do you think it would be possible to fit a small blower some where up top where the cpu/gpu is located?
Something like this (16mmx16mmx4.5mm):
http://www.digikey.com/scripts/dkse...ewproducts=0&ptm=0&fid=0&quantity=0&PV46=5197
It would need to be hooked up to 5V, some where like the USB or HDMI port connections on the inside or on the board.
It looks like there is a small hole underneath the camera in the lid that could act as an exhaust, a very restricted one, and the usb/hdmi/3.5mm ports may help intake and exhaust too.
I have noticed several tiny bright spots on the screen of my device but I am not totally sure if they are bright pixels or some other type of screen issue...or if it is even an issue at all. Basically it can only be seen in low light conditions and when the brightness is relatively high. It seems as if it may be stuck pixels but they disappear and reappear depending on the angle that I view the screen. Is this typical behavior of a stuck pixel or could it be some type of issue with the layers above the actual LCD display? And whatever it may be is there a remedy for it?
Hi, you can try to install a custom rom if you're rooted if not the then try to return the phone... there are some ways to play around with the screen res but when it comes to pixel problems you should try returning your phone. I had the same issue with my HTC Amaze 4g long ago and I had to return it.
What is throwing me off is the fact that they can't be seen if you tilt the screen in a certain direction. If they were faulty pixels wouldn't they be visible from pretty much any angle? It's difficult to tell being that the pixels on this display are so tiny.
Hello, I currently own a Galaxy S6 Edge, the black Sapphire one. The problem is that the screen is way too yellowish for me on white backgrounds, I did a comparison with my fiancee's HTC M8 and the difference is terrible.
I used to have some RGB sliders to caliber the screen the way I like on my previous phones. Isn't there any way to do the same on the S6 Edge to fix this ? (I'm rooted).
And BTW I don't want to use any screen filters as it decreases performance, i want real settings.
Thanks in advance
Have you set the screen to AMOLED photo? That should calibrate it to the right settings.
It's even more yellow with the photo mode :/
Bump, no ideas ?
RavenFoxHound said:
Hello, I currently own a Galaxy S6 Edge, the black Sapphire one. The problem is that the screen is way too yellowish for me on white backgrounds, I did a comparison with my fiancee's HTC M8 and the difference is terrible.
I used to have some RGB sliders to caliber the screen the way I like on my previous phones. Isn't there any way to do the same on the S6 Edge to fix this ? (I'm rooted).
And BTW I don't want to use any screen filters as it decreases performance, i want real settings.
Thanks in advance
Click to expand...
Click to collapse
The screen on the S6(E) is pretty darn accurate. Odds are the M8 is likely the inaccurate display and giving a bluish hue to the white instead of how white actually should appear. If you compare your phone and your fiancee's phone to a display that's accurately calibrated, you'll see how close to being accurate the display on your phone is. Also here is the review from Anandtech showing similar results in their display test.
Link: http://www.anandtech.com/show/7893/the-htc-one-m8-review/9
Most people are not used to having calibrated screens and therefore, view the bluish white as the correct white when the correct color temperature of white is more on the warmer side. Also screen filters such as Chainfire's CF.Lumen have very little if not zero performance reduction when running in root mode and they allow you to customize the temperatures for day/night/sleep mode with many options.
Edit*
Here is Anandtech's review of the display on the Galaxy S6(E). While there are small variances from display to display, unless you have a defective unit, I highly doubt there's more than a 5% difference between what you have and the review unit.
http://www.anandtech.com/show/9146/the-samsung-galaxy-s6-and-s6-edge-review/4