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[SOLVED] Black Screen Issue

OP gordonfink

2nd February 2014, 12:18 AM   |  #1  
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Hi. I am not sure this is the BSOD problem that others have had.

I bought a second hand i747. It came with 4.3. It will work fine for a few minutes when first turned on, then the screen will go dark. The menu and back buttons stay lit, and the touchscreen still works, the LCD just cuts off.

If I hit the power button, it sleeps the phone. When I hit again, the screen will come on, but only for about 5 seconds, then it's black again. Everything works, just black screen.

Is it possible for it to overheat or something? It doesn't feel hot at all, but if I turn it off and leave it for awhile, it will again work for about 2-3 minutes, then only about 5 seconds at a time again.

I swapped batteries, and it's the same. The battery had pink on it. I opened it up, and none of the other stickers showed water exposure, and the board itself was clean.

It has stock 4.3, and is not rooted.

I did go to phone settings and turned off the "darken screen during calls" checkbox.

I am wondering if the proximity sensor heats up and shuts the screen off. Grasping at straws I suppose.

Any idea of how to fix this?

Thanks
Last edited by gordonfink; 10th February 2014 at 04:20 AM.
2nd February 2014, 01:37 AM   |  #2  
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Perhaps a bad capacitor in the digitizer/lcd assembly? My TV had an issue with a bad capacitor that would cause the screen to blank out after a few minutes???

Sent from my SAMSUNG-SGH-I747 using xda app-developers app
2nd February 2014, 05:59 PM   |  #3  
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I'll try swapping boards in it later, and maybe at least narrow down if it's the board or the screen assembly. I have an extra proximity sensor I could swap, but it doesn't seem like it's that to me.

thanks, will post more after the board swap
9th February 2014, 07:50 PM   |  #4  
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Update: I switched boards (different carriers), and I could not replicate the problem in either phone. I had hoped that would show that either the board or the LCD assembly was bad, but I didn't learn anything useful either way.

I put the boards back in their respective bodies. It still happens now, but not as often. It also appears to be totally random. I did switch batteries in the problem phone, and it doesn't seem as bad. I will try another battery switch and see if that helps it more.

When the screen goes dark, the menu and back buttons are lit. When it went out last night, I could see that there was still some faint background light that I can't see in the day. I pulled up Youtube and did a video, and when the screen went dark, I could still see movement, but couldn't make anything out. So, the phone is still going in the background.

If I push the power button, it sleeps, then push it again, and it wakes up just fine. Sometimes I have to do that 4 or 5 times for the screen to stay on. Sometimes it goes dark after 10 minutes of use, sometimes a half hour, sometimes just a few.

Any help is appreciated.
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10th February 2014, 04:24 AM   |  #5  
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Well, right before throwing the phone into the wall, I noticed a partially removed liquid exposure indicator. I pulled the phone apart to check the motherboard.

In the process of taking it apart, I forgot to take out the SD card. In so doing, it pulled the sim/sd card module off the motherboard. Low and behold, there was a very light corrosive glaze in a few spots under the module.

So, I got out the 99% IPA, and a toothbrush, and cleaned the whole entire board. Since then, it seems to be working fine.

I don't know exactly what part getting cleaned fixed it, because I just cleaned the whole board.

Anyways, maybe that'll help someone with inexplicable issues downstream.
10th February 2014, 08:11 AM   |  #6  
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Thanks for following up with how you fixed the problem. In retrospect, water damage makes sense.

I dropped a Captivate into an ice chest full of melted water last year. I immediately pulled it out and the phone was mostly okay for a while but then the microphone didn't seem to work so well and occasionally the right third of the screen wouldn't respond to touch until I cycled the screen on and off. The water damage sticker and phone interior showed no signs of water.

I will probably sell the old captivate but with full diclosure about the history. Would have been nice if the seller had done the same for you.

Sent from my SAMSUNG-SGH-I747 using xda app-developers app
10th February 2014, 11:12 PM   |  #7  
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Thanks, I should have thought of it sooner, but it didn't seem to have any signs of water damage otherwise.

I ordered the 99% IPA online, because I couldn't find any locally. It works wonders with previously wet boards. You might be able to bring it back.

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