Cleaned laptop, boots but screen is black


Apr 15, 2017
My laptop was very dusty, so being really careful and following video instructions I took it apart, used compressed air and cleaned it, and put it back together. Now the screen is always black.
The model is a Toshiba Tecra S11.
I can login to windows (verified by sound). The computer realizes when the screen is closed and open (again, by sound).
All connections seem to be connected, and I was careful when putting it back together.
Tried Fn+F3 to increase brightness, and Fn+F5 to change output to no avail.

Any other ideas? Could I have messed up the backlight? (Barely touched the screen when I took it apart).

Any other info that might help?
Super appreciate quick replies, I am at wits end.
Try this...

1. Turn the laptop off (not sleep or hibernate but off).
2. Connect an external monitor to the laptop.
3. Turn on the external monitor.
4. Turn on the laptop.

NOTE: You may have to press an "external monitor" button. Could be the f4 button or a button with two monitors on it, for the external monitor to work.

If you can see fine on the external monitor, then your attached display, or the ribbon cable that connects it, are your problem.

If you can't see on the external monitor at all, or the problem occurs on the external monitor as well, then it is probably the graphics card/GPU that is the problem, which may require the motherboard be replaced.


Apr 15, 2017
Thanks for your suggestion.
The external monitor is working fine, and I doubt I hurt the monitor. I have tried to double check the cables, but can't see anything out of place.
What is the ribbon cable, how do I locate it and see if thats the problem? I see two cables going from the screen, one by each hinge. They look Ok, and both pass into a tube-ish, cant see more. Have disassembled the laptop once more to try to find where it connects to the motherboard, but unable to find it
Any description would be helpful.
It is so different inside every device, so I am not sure on the locations on yours. However were you to do a search online, I am sure you could find video(s) on how to replace a display for that device. Which then should show you the correct location for the cable(s).
Thread starter Similar threads Forum Replies Date
ototoxin Laptop Tech Support 0
yaezah Laptop Tech Support 1
--juliana-- Laptop Tech Support 8
B Laptop Tech Support 9
J Laptop Tech Support 9
F Laptop Tech Support 3
E Laptop Tech Support 1
C Laptop Tech Support 8
J Laptop Tech Support 3
M Laptop Tech Support 1
J Laptop Tech Support 3
T Laptop Tech Support 3
S Laptop Tech Support 1
T Laptop Tech Support 3
I Laptop Tech Support 6
T Laptop Tech Support 1
O Laptop Tech Support 4
M Laptop Tech Support 2
T Laptop Tech Support 2
D Laptop Tech Support 9
Similar threads
Question Did something to my laptop while trying to clean it, not sure what I just did...
Question MSI GS60 Laptop won't turn on after cleaning fans. Front LED lights up for 10 seconds then turns off. No sounds of fans or components.
Question laptop overheating even after cleaning and reapplying thermal paste
Is it ok to use crc to clean my laptop fans?
Laptop (dell XPS 9570) only boots after a break.
Solved! asus laptop blank screen after cleaning
My Fujitsu lifebook series laptop shuts down after all the cleaning and applying thermal compound. Please what could be the pr
Laptop makes a lawn mowing sound. Didn't make this sound before I cleaned out the fans and after I clean out the fans.
How to thoroughly clean a laptop after sugary spillage?
Laptop keyboard not working after cleaning (possible liquid damage)
Messed up when install new window on a laptop with intel optane
I opened my laptop to clean the fan, after assemble it back it won't turn on, however the power button is blinking.
Laptop once booted after cleaning then turned off itself and cannot turn on anymore
Laptop won't boot after fan cleaning/ thermal paste replacement
Gutting a laptop
need clean copy of windows 7 home premium boot disc for toshiba l655d laptop
New Laptop, New SSD, Secure Boot and Fresh Windows Install Issue
My laptop won't boot after cleaning it. Help!!!
I have sony vaio pcg-61212w, after cleaning cooling Fan, MY laptop is not booting, screen is not glowing , on pressing power b
Can't boot clean install of Windows 8 on Samsung laptop