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[Q] Screen remains Black although Device still boots?

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By soundl3ss, Junior Member on 4th July 2014, 12:10 AM
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Hey Xda,
I'm certainly not a newbie to flashing/modding but this one puzzles me quite a bit:
Today I got a Galaxy Note from a good friend of mine, the device is still running on stock ROM and has never been rooted.
When I try to boot up the device you'll hear the usual boot sound and after a while the softkeys backlights will light up, while the screen won't. My friend reported to me that he had issues in the past connecting the device to any given windows PC, as they won't even recognize the device. I however can't verify this as I'm using arch Linux on almost all of my workstations.
The main objectives are:
- backing up the entire internal storage, because my friend produces music and there are lots of samples/unfinished tracks on this device
-eventually get this device working again.
The main problem is deciding whether the device has defective hardware or just somehow screwed up firmware.
The gameplan so far is backing the device up via adb if nothing else is working and then reflash the whole damn thing, if there is still no improvement I guess the hardware is to blame.
Any constructive advices on your end? It would be much appreciated as this seems to be a fairly common problem. Anyways I'll keep you up to date
4th July 2014, 12:20 AM |#2  
nokiamodeln91's Avatar
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Are there any touch haptic responses on the screen? Then this could be an issue of corrupt or wrong bootloader installed.
4th July 2014, 01:05 AM |#3  
Azeazezar's Avatar
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Try booting into recovery and/or download mode.
And check for a battery icon while charging and off.
A problem with the boot loader on stock android without even root sounds unlikely.

If the screen stays black, i thinks its very likely that the connector from the display came loose.
lucky you, the note is not that hard to take apart, and the connection should snap back in no problem. In fact, i think that should be stap one, check the connection.

About connecting to the pc, that could be more difficult. From the description i think the usb board is in need of replacement. Also a relatively common, cheap and easy fix, but make sure you get the same revision as the one you have now.

---------- Post added at 02:05 AM ---------- Previous post was at 01:49 AM ----------

Another idea would be to connect an mhl cable and use that to see what should be on the screen. This depends on the usb port being fine, but may be worth trying anyway.
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4th July 2014, 01:19 AM |#4  
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So for the purpose of continuity I'll post any useful links I used along the way.
At first I'll back the device up. This will be no problem as adb works just fine on my Linux box with this device. The next step would be trying this:
If that does not work I'm assuming defective hardware/or bad connection due to dust. I'll disassemble the device like this:
And clean up the connector/ribbon plug with isopropyl alcohol
Last edited by soundl3ss; 4th July 2014 at 01:24 AM.
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4th July 2014, 02:21 AM |#5  
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I managed to reset my old account so I'll be posting from this one, not to cause any confusion...
5th July 2014, 02:43 AM |#6  
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if you are getting charging animation
or galaxy note logo on bootup

then you need to flash an alternate kernel or reflash original

else forsure there's something went wrong with your hardware
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