[Galaxy S 5 Q&A, Help & Troubleshooting] Reyse:
Hi everyone

I want to share a workaround to all of us who owns a defective S5

Symptom: You unlock your phone and it doesn't show anything. Actually, the phone is working. Capacitive buttons light up and you may heard some activity in the phone

Your phone has a defective screen. There are a lot S5 which have this problem, according to several forums. After several tries, unlock and lock over and over, the screen light up and you are able to use your phone. The problem is when you receive a call and you want to know who is calling you, the screen doesn't illuminate and you won’t be able to know who is.

Here's a workaround which makes your powerful S5 usable and take out from your drawer.

Solution:

The more effective way to fix it is: change defective screen! But sometimes it could cost as much as a new phone, or simply you can't afford it, and it's better to change your phone instead, and you put your S5 in a drawer.

The technical explanation of this problem is: Screen doesn't receive enough electrical current at low brightness levels (maybe the flex is defective, get old, etc)

Most probably the wake up problem exist together with screen flicker at low brightness levels

The wake up problem rises up more in dark environment, when light sensor make low bright screen

The lock screen light up screen, with a dim effect: when you lock the phone, it slowly turn screen off, and when you unlock, it make and effect of dim screen.

When you are is in dark environment, the effect is very slow, preventing the screen illuminate because the technical problem explained before.

When you are in very light environment, you lock screen and sensor light make the screen very brilliant and chances are you defective phone wakes up correctly.

We can use an app which give us complete control over brightness subsystem. I use an app called Velis AutoBrightness:

Once installed from Play Store, it shows a Setting Wizard. Follow the instructions. Below are some notes

•	1/7: Welcome Screen

•	2/7: How bright... Most probably is your phone always have flicker in low brightness. Choose "AMOLED" or "AMOLED bright". By the way choosing any one of those cure always minimum brightness failure!

•	3/7: Choose High sensitivity

•	4/7: On, if you want additional brightness when charging. Irrelevant for this thead. Choose your favorite setting

•	5/7: Same of 4/7

•	6/7: Choose enable: That enable the app

•	7/7: Some additional notes: Press Done

Now important settings: go to Menu > Settings > General: Settings Mode > Advanced

Service Activation settings:

•	Disable system handler > ON: When you use Power saving mode, you surely noted screen flicker, which is very annoying, and make unusable power saving mode. By set this ON: Android doesn't set screen too dim; instead Velis have a minimum of brightness set by Wizard 2/7. (Surely you find out that you avoid screen flicker, by setting autobrightness off and slider in 8-10%)

Sensors settings:

•	Screen-on sensor value override: Set this value to 30000. Read below this post if you want technical explanation of this setting

After you establish these settings, you'll be able to unlock your phone all the time!

This is the trick: When you unlock your phone, you'll note that the screen is very bright (because Screen-on to 30000) and quickly adjust to the environment light. The failure is that electrical current to screen is defective, and when exterior light is dark, the screen make a dim effect and doesn't light up.

Note to Marshmallow users:

•	This app make use of Screen overlay permisions: And marshmallow is very restrict with this kind of app. This is specially true when you are installing an app. All you have to do is deactivate the app in notification screen: press "OFF" button, adjust system brightness upper enough to not flicker the screen, install your app, and activate Velis Autobrightness again

•	Because of Doze mode, wake up from this mode may avoid your screen light up, the first time you use your phone. Let 10-15 seconds your phone wake up, lock again, and unlock again, and velis will make its work!

I hope this post make your smartphone usable. I barely apply this trick to two phones, but I think this is a good workaround!