I went back in to get it fixed right, and he sentered me away saying it's probably a hardware issue and tried to get me to buy a new phone, but not before he fooled me into wiping the memory again. Everything seemed fine for a few hours, but soon the trouble started back up. I took it into the store to get it handled this weekend, and they wiped the memory, resetting to factory specs. Sometimes it took as long as 10-minutes of repeatedly pressing the power button before the screen would stay lit. The biggest issue for me is that it often takes a VERY long time to wake it from sleep. My S5 has been having this problem for months. If the hard reset failed, then have a technician check the problem for you. Press the Power key to restart the device. When the master reset is complete, ‘Reboot system now’ is highlighted. Press Power button to select and start the master reset. Press the Volume down key until ‘Yes - delete all user data’ is highlighted. Press the Volume down key several times key to highlight ‘wipe data / factory reset.’ When the Android System Recovery screen appears, release the Volume Up and Home keys. When the phone vibrates, release the Power key but continue to press and hold the Volume Up key and the Home key. Press and hold the following three buttons at the same time: Volume Up key, Home key, and Power key. Of course, backup all your important data before doing that as they will be deleted. Troubleshooting: Screen flickering issue can be hardware or firmware problem and since there’s not much information here, you have to other option but to rule out the possibility that it’s just a firmware issue (which I really think it is) by performing hard reset. I have not dropped the phone or exposed it to water – the issue started out of the blue and it’s driving me mad! Please help. Raising the brightness a few notches stops the flickering. Problem: When the screen brightness is lowered to the lowest setting, the lower half of the screen begins to flicker. GALAXY S5 SCREEN FLICKERS WHEN BRIGHTNESS IS SET AT CERTAIN LEVEL I'm still using a Samsung S4 and only now that I have verified it won't upgrade to the Android 6.0 OS am I considering replacing it within the next year or so. 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. 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. 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. With the added security concerns of these apps possibly collecting screen shots and sending them to another site, I would avoid this. 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. They also require a rooted device, which could void warranties. 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. This keeps the power up on the pixels but adds a black overlay, kind of like a screen filter. There are apps that attempt to resolve this by putting a translucent black screen over your desktop and apps. I also noticed that before the screen locks on timer, it dims to low power for a few seconds and flickers as a result. 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. Just enough current goes through the motion sensor to keep it's circuits active, and that current causes a flicker in the light. I see this problem with some LED and CFL lights on motion sensor switches. 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. In LED screens, a back light controls brightness, but AMOLED screens send current to each pixel for brightness control. When the display circuits get old or damaged, they don't sustain current at low power settings. In my research thus far, the AMOLED screen technology is to blame.
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