Laptop display on briefly

Tony D

Super-Moderator
Jan 18, 2016
SE Pennsylvania, USA
Thread starter Admin #1
Toshiba laptop. The Toshiba logo comes on when booted. Then screen goes black. Computer continues to boot.

Using a flashlight to shed some light onto the screen, I can see that the graphics are working. I can see that there was a problem and Windows is trying to repair it.

I pulled the hard drive. Again, the Toshiba logo comes up and then the backlight just quits. I can see the BIOS text on the screen if I shine a flashlight onto the screen.

So it looks like the backlight is working during the POST and then it shuts down. Can this be a board problem?

btw: it's fluorescent, not LED. Maybe it's the inverter.
 

Tony D

Super-Moderator
Jan 18, 2016
SE Pennsylvania, USA
Thread starter Admin #4
Didn't find the inverter, but did find a display with a fluorescent backlight. Connected it to the inverter in the laptop and it's shinning brightly. Looks like a bad fluorescent tube in the display. Tried only once to replace just the tube. It didn't go well because I broke the tube. Didn't know how fragile they were. I may try again, but be more careful this time.
 
Jul 19, 2014
US
#7
Indeed that can be one of the downsides of laptop ownership Tony. However it helps you have the technical skills to mitigate any problem. Good luck with the new display :)
 
Jul 19, 2014
US
#9
Awesome! Luckily on my two laptops (both HP Elite Books) no display issues yet. I did have an issue getting the track pad working correctly with Windows 10 though initially, but after some playing around got it working.
 

Tony D

Super-Moderator
Jan 18, 2016
SE Pennsylvania, USA
Thread starter Admin #12
I've replaced a number of laptop display. I'm sure other techs here have done the same.
I think display replacements are only second to DC jack replacements when it comes to laptop repair.
 
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