Screen won't turn on, touch will works - Samsung Galaxy S8 Questions and Answers

Hello, recently I damaged the screen on my s8 where the screen wouldn't turn on and no input would work, so I figured it was the LCD and digitizer that needed replacing. I've replaced those parts, and the touch works now but the screen never turns on. I turn the phone on and see the blue notification light that turns on when the Samsung boot logo comes up, but can't see the boot logo itself. I can unlock the phone because I've memorized the pattern/placement and I can hear the volume change sounds when I adjust the volume.
I've tried cleaning the PCB contacts, holding the volume down + power button, holding volume up + power + bixby, and I've changed the battery and verified it works. Anybody know what could be the cause? Faulty screen? The company I bought it from is asking me to send it back to verify if the screen is faulty, by I'd rather not go through that trouble if the problem is with my motherboard or something. Although, because everything else works, it does lead me to believe the screen itself is bad?

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Broken power switch - broken off mainboard

Hey all, I'm new to the forums but I can't wait to get my 8125 working. I bought a replacement screen on ebay and a broken 8125.. on receipt all I got was a white screen, then last night I replaced with the new screen and got the cingular logo and the windows mobile "touch anywhere to set up.." message.
Well, touching it did nothing, and the keyboard didn't work, so i opened it up again.
Somehow when I opened it up, the power switch button circuit thing detached from the mainboard (and it looks like the owner before me had actually crazy glued it on!!) .. and now the thing won't power up, won't show a charge light... nothing at all when plugged in or attached to my PC. So I hope that detached power button is the culprit. Upon further inspection I saw that yet another had detached but I can't seem to find where it landed... this one for the little button next to the slider, I don't really know what it does yet.. .
.. so I guess first step is to solder that power button back on and see what happens. Does it sound like a missing power button circuit thing would cause the unit to no longer power on at all (even when soft reset when connected to PC, which used to power it on?)
Pete
i did this. it is hell to solder on. I would say replace the phone
thacmonster said:
i did this. it is hell to solder on. I would say replace the phone
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Click to collapse
Argh.. well, i'll give it a go with the power switch.... do you think it will affect the phone to be missing the comm manager switch off the mainboard too... or will the phone still function without this piece soldered on?
peteclark3 said:
Hey all, I'm new to the forums but I can't wait to get my 8125 working. I bought a replacement screen on ebay and a broken 8125.. on receipt all I got was a white screen, then last night I replaced with the new screen and got the cingular logo and the windows mobile "touch anywhere to set up.." message.
Well, touching it did nothing, and the keyboard didn't work, so i opened it up again.
Somehow when I opened it up, the power switch button circuit thing detached from the mainboard (and it looks like the owner before me had actually crazy glued it on!!) .. and now the thing won't power up, won't show a charge light... nothing at all when plugged in or attached to my PC. So I hope that detached power button is the culprit. Upon further inspection I saw that yet another had detached but I can't seem to find where it landed... this one for the little button next to the slider, I don't really know what it does yet.. .
.. so I guess first step is to solder that power button back on and see what happens. Does it sound like a missing power button circuit thing would cause the unit to no longer power on at all (even when soft reset when connected to PC, which used to power it on?)
Pete
Click to expand...
Click to collapse
Yes, the power on/off button being broken is the reason why you had a white screen, and only getting the splash screen after replacing the touch screen. If you're a good assembly man, I'd suggest try to solder the button back ln place or replace the device. As for the button by the volume slider, that's the comm manager button. If you can ever get to the homescreen, the comm manager icon to activate the comm manager (bluetooth, WiFi, etc. is in the system tray at the bottom of the homescreen.
It sounds to me the new screen was replaced improperly, accounting for nothing happening when you tap it.Try re-installing the replacement screen.
8125
2.25.11.1

LCD broke . How to reset

Horrendous day. I dropped my phone today and lcd is broken. Screen does not turn on. However i see that the phone boots up. I can make that out by looking at the hardware keys that light up and when i press the volume button, i hear the sound.
My question is how can I factory reset the phone ?
Just connect to screen via HDMI cable
I figured other way out. Thanks for the advice

[Q] Screen repair - screen won't power on?

I am attempting to replace my Nexus 7 digitizer and LCD screen with one I purchased from gadgetfix on eBay, and I can't get the replacement screen to power on. Can someone advise me on things I can try to get it working?
I used a guide on Android Authority and understand that there's two ribbon cables that need to be re-connected (one that feeds through the body of the tablet, and one dual-connector that wraps around the side), as well as the power connector.
I can tell that the Nexus does power up when everything is re-assembled and I press the power on button. Plug it into my Mac, and Android File Transfer boots up. I think the digitizer is responding because when I touch the screen, it says stuff like "Welcome" and "English United Kingdom" (I'm guessing this is the Welcome language selection screen).
If I press the power button while it's turned on, it says "Screen off." Also, at one point it said "1:30am ringer 70 percent."
This is my second attempt at this - after returning/replacing the first one, I encountered the same issue. So I'm starting to think it's either my tablet or something I'm doing.
Any ideas? Thanks in advance!
have the same problem here... and many more out there...
bought new screen & digitizer from china phone accessories as recommended from you tube user... specifically requested for 3G model since it seems that different version has different screen...
fixed today, already checked the connection multiple times, but the screen wont show anything... there's power for the screen... is there anyway to workaround it... tried the power + volume button press but still no respond... since there's no respond on this thread for more than a year, it must be very bad issue...
would try to swap screen with my other unit but afraid the worst could happen, both unit wont show anything...

Samsung Sm- J120H aka Galaxy J1 (2016) LCD problem

Hello, I hope this is the right forum for my question, sorry if I made a mistake. Anyway, my uncle bought this phone month ago in another country, everything worked fine until yesterday when LCD stopped working. After some time of trying to fix it, we concluded that if you press volume (up, down or both at the same time) button and then the power button, screen turns on and works for some time (couple minutes) but then goes black again. If you just press power button (without pressing volume button) it stays black but you can still hear it unlocks when you slide your finger across the screen, so touch screen works, phone works but LCD is black. I am guessing it's loosing connection but how does it turn on every time when I press volume button? It's very confusing. Phone was in a protective case since first day and it hasn't been dropped. Since it's bought in another country, it would cost more to return it there than to buy new one, so do you have any ideas? I have been replacing lcd screens for my friends last two years so I was thinking maybe I can disassemble it and check connections. Any help? sorry for my bad english
Luka keko said:
Hello, I hope this is the right forum for my question, sorry if I made a mistake. Anyway, my uncle bought this phone month ago in another country, everything worked fine until yesterday when LCD stopped working. After some time of trying to fix it, we concluded that if you press volume (up, down or both at the same time) button and then the power button, screen turns on and works for some time (couple minutes) but then goes black again. If you just press power button (without pressing volume button) it stays black but you can still hear it unlocks when you slide your finger across the screen, so touch screen works, phone works but LCD is black. I am guessing it's loosing connection but how does it turn on every time when I press volume button? It's very confusing. Phone was in a protective case since first day and it hasn't been dropped. Since it's bought in another country, it would cost more to return it there than to buy new one, so do you have any ideas? I have been replacing lcd screens for my friends last two years so I was thinking maybe I can disassemble it and check connections. Any help? sorry for my bad english
Click to expand...
Click to collapse
Hello there, I'm from Brazil, as my english may not be the best lol... So I have same phone as you and similar problem... The problem is that volume down doesn't work. Other buttons work fine though. Also, the phone always enters in safe mode, so I assumed the volume down button is being pressed all the time. Except that, I realized that I could enter in download mode (I tested, if I don't press volume down in the combo 'power button + home + volume down' it won't get into download) and if I press volume down to cancel it will actually cancel and restart the phone. So the button is working... Here is the part where I think the problem is similar. There was a time I turned the phone off, through the system as we normally do, and then it wouldn't turn on again. I realized it was actually turning on, but the screen was black. I tried entering download mode and tested on odin and it actually had entered download mode, but the screen was black... Then after several attempts it finally got back on again... So I think there is something related with the button circuit with the lcd, I don't know. I would like to know if you got to any solution there. I guess that instead of bringing you any solution I'm bringing another problem lol. Well if I have any other information I will post it here. Best wishes.

Problem with a friends S5. The screen keeps going out.

When I turn the phone on the screen lights up for about a half a second and show the logo. The phone fully boots and all buttons work. When I push the power button to turn the screen on it does the same thing. I can see that its at the home screen. There is no water damage and the phone hasn't been dropped. Sometimes I can get it to boot up with the screen working right. Is this a common problem? What is the cause of this, bad screen, mainboard, software?
Thanks

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