Forum Thread

Laptop screen goes black randomly

rsdown 31 10 February 8, 2016 at 12:11 PM
Hi all,
I have a Levono T400, maybe 6 years old. Win 7. Only thing I've changed for the original is the HD to an SSD. Nice laptop except it has an issue with the screen. It will randomly go black & then comes up again. Takes about 5-10 sec, total. The computer continues to function. It doesn't lose the internet connection (wireless) when this happens, it appears to be just a screen glitch. I can't say if it ONLY happens when I'm on the 'net, because that is what this computer usually does. I asked this in a Lenovo forum, and got nada. I am looking for a new one, but if I can figure this out, I'd just keep it. It does everything I need. Any thoughts? And am I using something that is telling me it is about to go belly up?
Thanks!

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Joined Aug 2005
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#2
Can you plug in an external monitor and see if it happens in the same way? This would rule out the laptop screen itself and cable connecting it to the computer.
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Vague questions receive vague answers . . . . . .
#3
Could be onboard video chip, so yeah.. try external monitor.
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Joined Jun 2011
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#4
I'll try that for a few days & update then. It's totally random, so even if it doesn't happen, it'll be hard to say that's it. But it's a start. Let you know.
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#5
have you tried to make it happen by moving the screen open and closed or flexing the keyboard?
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#6
I have a client with a T400 that goes blank like that. Most of the time it comes back but sometimes it doesn't and he drops it off with me. I partially disassemble it, disconnect the internal monitor cable, reconnect it, and it's fine again. I think the built in cable connection is just loose. I've offered to show him how to do it but he'd rather pay me to "fix it" for him. It's a pretty easy fix, just go to the Lenovo site and look up the service manual for the laptop.
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#7
Quote from carmen617 View Post :
I have a client with a T400 that goes blank like that. Most of the time it comes back but sometimes it doesn't and he drops it off with me. I partially disassemble it, disconnect the internal monitor cable, reconnect it, and it's fine again. I think the built in cable connection is just loose. I've offered to show him how to do it but he'd rather pay me to "fix it" for him. It's a pretty easy fix, just go to the Lenovo site and look up the service manual for the laptop.
I agree with Carmen617 I've seen this exact thing twice in my career In the end I used hot melt glue to hold the cable in place.

Yea I think it is safe to say Spinrite wouldn't fix this.
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#8
Quote from dale_101798 View Post :
Yea I think it is safe to say Spinrite wouldn't fix this.
You sure about that? its only 89 dollars with a free return period.laugh out loud
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#9
Thanks! I'll check out the Lenovo site. I'd so love this to be an easy fix, even if I have to do it from time to time.
To answer the other question, opening, closing, wiggling, twisting the screen does not seem to have an effect. I can't "make" it happen.
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#10
Quote from rsdown View Post :
Thanks! I'll check out the Lenovo site. I'd so love this to be an easy fix, even if I have to do it from time to time.
To answer the other question, opening, closing, wiggling, twisting the screen does not seem to have an effect. I can't "make" it happen.
When the screen goes black - shine a flashlight onto the screen and see if you can see the picture. What you're describing almost sounds more like a backlight bulb flaking out, so wiggling the cable wouldn't do anything for you.
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#11
Quote from Ero View Post :
When the screen goes black - shine a flashlight onto the screen and see if you can see the picture. What you're describing almost sounds more like a backlight bulb flaking out, so wiggling the cable wouldn't do anything for you.
It looked pretty black to me, but the next time I'll do that. Thanks!
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#12
Ok, happened again finally. Just the laptop, no external monitor at the time. I was running a program that worked via ANT+ & running Pandora at the time. It was sitting completely still on a table for about 35 minutes before this happened, so it's not movement related. At least, not immediate movement related. There was no glitch in either the program (no pause, hiccup or otherwise) or Pandora (not even a momentary pause in the music), so I'm leaning towards a monitor or cable issue.
So,Carmen617, is this what I want? https://support.lenovo.com/us/en/...r-71544-kr
There are 14 things to remove to get to the cable? Wow.
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#13
Quote from rsdown View Post :
Ok, happened again finally. Just the laptop, no external monitor at the time. I was running a program that worked via ANT+ & running Pandora at the time. It was sitting completely still on a table for about 35 minutes before this happened, so it's not movement related. At least, not immediate movement related. There was no glitch in either the program (no pause, hiccup or otherwise) or Pandora (not even a momentary pause in the music), so I'm leaning towards a monitor or cable issue.
So,Carmen617, is this what I want? https://support.lenovo.com/us/en/...r-71544-kr
There are 14 things to remove to get to the cable? Wow.
That's certainly a daunting list, but on the system I support all I have to do are the first three steps - get under the keyboard. The monitor cable is attached in the upper left, and it's clearly loose. I detach it and reattach it and all is well for the time being.

Hope it's that easy for you - good luck!
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#14
Quote from carmen617 View Post :
That's certainly a daunting list, but on the system I support all I have to do are the first three steps - get under the keyboard. The monitor cable is attached in the upper left, and it's clearly loose. I detach it and reattach it and all is well for the time being.

Hope it's that easy for you - good luck!
Thanks. Hopefully that's all it takes. It does seem like I'd be taking the thing almost completely apart this way.
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#15
try to go to local computer repairing center and check the cable connection between the led and hardware
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