This may seem a bit strange, but I have an old i9300 that has run into a bit of an issue. The device itself runs fine, boots CM12.1 (Unofficial port, I know), but the issue is that sometimes the LCD Display goes to a point where it's unreadable. It'll look fine on a normal startup (Displays the Samsung Galaxy S3 GT-i9300 Logo), but then the display dims after that. While in Download Mode, it'll do the same thing. Attempting to reboot into recovery with this display dimmed causes a bootloop. I know that the AMOLEDs don't have backlights, but every so often, the backlight (I know that's not what it's called), will function properly. It's a very strange conundrum. Could it be that either something is loose, or the AMOLED is going out?
There is no backlight on AMOLED, each pixel illuminates individually so your problem is with the screen driver or connections. Water damage can cause the symptoms you describe, first step is to strip down the phone and check the connections.
boomboomer said:
There is no backlight on AMOLED, each pixel illuminates individually so your problem is with the screen driver or connections. Water damage can cause the symptoms you describe, first step is to strip down the phone and check the connections.
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I gave it a thorough strip-down and checked for signs of water damage, but there wasn't any water damage to be found. I checked the strips that indicate water damage and they were still white. I also checked the connections, reseated them firmly and restarted. I haven't had the issue again since, but it's not a consistent issue, it pops up every so often.
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I just picked up my S3 and the whole screen had a hazy green tint on the lock screen and was the same when I unlocked, and I wasn't gonna mess about so rebooted quick and back to normal now, and I read another thread about it but isn't clear why it happens, but I checked the battery graph and there's just a huge gap as if no power was getting through at all, so has anyone else had this happen on S3 and what's causing it?
Michael_P said:
I just picked up my S3 and the whole screen had a hazy green tint on the lock screen and was the same when I unlocked, and I wasn't gonna mess about so rebooted quick and back to normal now, and I read another thread about it but isn't clear why it happens, but I checked the battery graph and there's just a huge gap as if no power was getting through at all, so has anyone else had this happen on S3 and what's causing it?
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Just had this, I put my phone into my shoulder bag, cycled for 10 minutes, picked up the phone and the entire screen was green as if the red and blue pins from a monitor cable had disconnected.
I'm also having charging difficulties, although that may be the cables.
I'm on CM9, literally just updated to the newest nightly now to see if that sorts any issues. There's something just not quite right about this phone of mine. A quick reset was all it took to sort the screen out but it was scary to think such an issue could occur.
All I know is it's something to do with a sudden dip in power and I read about other phones doing it too very occasionally, and after it happened there was a gap on the battery chart as if the phone was getting no power at all.
Sounds like the OS or at least an important process crashed or got stuck (deadlock, livelock, ...).
Green color has something to do with the rendering process and/or screen calibration. All Galaxy S1 with Voodoo patches for the display color values show a green screen for a very short instant after screen-on.
That also explains the gap in the battery stats since a non-functional OS cannot collect any informations.
Did you run any particular apps which might be causing it?
Without any details I can only recommend the standard package: flash your OS again, factory-reset it.
Maybe wiping the cache is enough. Maybe it's a hardware fault, hard to say...
I just rebooted and I've already upgraded since then, and I wasn't doing anything really at the time except I think that was around the time I used G L to SD and it broke the Play Store, but when it Hulked on me I hadn't touched phone for 40 minutes and that's what I saw when I woke it up. but most people say it's a once in a lifetime thing so not really worried.
Hey there!
I'm currently trying to repair an Xperia Z2 that had water enter its chassis. The initial fault was that the backlight was completely non-functional with the screen still working as you could make out stuff when shining a bright light on the display. I read that this can be due to a blown fuse on the board, but before attempting to solder, I decided to get a replacement screen first.
The replacement screen has the backlight working, but it's very dim as if it was fixed to the lowest brightness setting. Naturally, I tried changing that in the Android settings, but to no avail. Various combinations of settings like turning the adaptive brightness on or off also does nothing. I tried a factory reset as well, but the issue persists.
Could this still be due to a bad fuse? At the very least, the old screen definitely had a defect since the new one has the backlight working at least somewhat. I'd be surprised though if there was a fuse solely responsible for letting you control the backlight brightness.
I checked one of the fuses commonly suggested to be responsible, as explained in this post. It's still conducting electricity though, so I doubt that's it. The other fuse is near the CPU below the heatsink, but I had trouble testing that since it's covered with some non-conducting substance like a resin of some sort.
What do you think? Any help is appreciated!
Hi did you ever find out what the problem was?, because i have the extact same problem with mine after water came into it and i replaced the screen.
any info could be of help
Seems that a lot of people complain about this bug/glitch. It mostly happens with this device, specific to some carrier like s5 t mobile etc. Mostly what people face is flickering with a green/yellow nuance that covers at least half of the screen, and that happens when you set screen brightness on minimum. Some other ( like me ) also get the flickering while turning the screen on or off. So I started doing some searches over the web, and tried all the 'fixes' possible. Sadly to me nothing worked. Some of these 'fixes' are :
Turning off auto brightness.
Turning off adaptive display.
Turning off screen overlay ( found on developer settings )
Also other strange ones like removing your sd card etc. Few people say that these worked for them, but for me it didn't.
I tried booting on safe mode, and the problem was still there. I also flashed official 5.0 and the same. So the only thing left was to blame the hardware. But I was sceptical about this since the problem is not persistive, sometimes it happens, sometimes not. Sometimes it happens on small scale, sometimes it is worse. Also a lot of people say that their devices were working fine and the problem started after marshmallow update. A certain person on an online forum claims that he/ she spoke with samsung officials and they are aware about this problem and working on an update to fix this. Does this mean it is not physical problem but just a software glitch ? Hard to say, I sent my phone to different local repair shop and they say it is screen physical problem. But maybe they just want to scam me and take money ( new screen costs too much )
After going through all these, I just got the idea to try and flash an older firmware, like kitkat. And to my surprise, on official kitkat rom it still does the problem, but FAR less.
So TLDR if you have this glitch and gave up on all the 'fixes' you found online, try flashing kitkat, it might work for you even if it's not a permanent fix.
I'm sorry to bump this topic being that it seems dead. However after my own research and now my second S5 from T-Mobile. I'm at the same point as you. My research states that it's more of an AMOLED screen issue, which after a factory reset and flash of older ROM and such does make sense. However, at the same time it could be an actual issue with the screen.
It's definitely a hardware issue in my case-cold temperatures exacerbate it ie-I have no flicker issues in the summer, but get flicker issues in the winter if my phone cool's down to the 60s. The flicker goes away if I heat the screen.
It seems the lower the temp, the more wattage (brightness) is required for the display matrix to function; insufficient wattage/heat when the screen is activated, and the matrix collapses. This is why it autobrightness tends causes issues when it provides power below threshold for matrix stability.
Easiest legitimate econimical fix is ordering a replacement screen, if you have reaervations about yiur shop doing it, it's a very easy/cheap/simple process to do yourself and plenty of how to YouTube videos.
okay, I will solve this issue for yall. I have an s5 g900t that had the screen flicker issue and also when temps are cold, the screen would blank out till I warmed the screen. I fixed this issue after a year of having the issue. a temp fix which can damage the device was found by accident when I went to change out a broken rear cam. heating the screen with a heat gun during surgery fixed the issue for a while then the symptoms came back. after much much research and testing, I found the amoled screen was the culprit. I ordered a new screen and replaced it. no more issues. I took the old screen and replaced it to my other s5 which is for testing only and the screen flickered under low light and would not come on when cold. so, if you have a screen that is flickering in low light and/or wont come on during cold, its your screen. replace it and fixed. how long the new screen will last? well 2 years later no problems, yet.
FYI, AMOLED screens are notorious for this issue and the manufacture is well aware.
So I've had the Snapdragon version for over a year now. There have been a few drops, but I've always used a screen protector and case, so there aren't really any visible damages. Recently though I've noticed some problems. The touch screen is malfunctioning if it gets warm (either in a hot room/outside (as it's summer and pretty hot here)/while charging). After turning on the touch visualizer in the developer settings I could see that it was registering another touch at a random place on a screen. This makes the phone unusable until I reboot it, which solves the problem temporarily. Another rproblem I have, is that sometimes a few black dots appear in the middle of the screen randomly. They just flash up then disappear. It's not a deal breaker, but rather annoying. Can anyone give a diagnosis on these problems, what could I do about it?
Due to damage done to the LCD of my S II I had to replace it. So I did that and I noticed two very serious issues. The first being the unresponsive touch buttons to the bottom right and left of the device. They were also not illuminated, there was also no evidence to suggest they were not connected correctly.
The second issues and by far the biggest is the unresponsiveness of the touch screen. When I enter my pin the first touch takes a few seconds to respond, then it proceeds to work as normal until the phone is unlocked. From that point whenever I try doing anything it behaves erratically. For example when I dial out it is painfully slow to respond to the inputs given to the touch screen.
Is there are way to address these issues and remedy them if so how could this be done.
Looks like a bad piece of hardware. Did you get the spare part from a trustworthy store? About the softkeys, you could check if the connector is connected correctly. As a workaround, you could use onscreen buttons.