Question about Computers & Internet
The backlight for the screen switches on correctly when the computer is turned on from cold boot or sleep mode or fn-F5 to change monitors. The backlight stays on for 5 seconds and switches off. I have replaced the inverter and screen with the same fault present. I have ruled out the lid switch (it was a hall effect diode triggered by a magnet on the lid) as this works correctly. If I unplug the input to the inverter and plug it back in, the screen comes on for 5 seconds. I can repeat this indefinitely with the time remaining 5 seconds. If it was a heat related issue, the time should decrease. Also the video card appears correct as there is still a picture on the screen and I am using an external monitor. This fault is the same when in the BIOS. I have been through all the settings in both the BIOS and device manager and every thing appears OK and also I am fully protected from viruses (Trend Micro). I have reseated every connection and board on the motherboard. I am now out of ideas. Short of replacing the motherboard which there is still no guarantee that this will fix it either. Thanks in advance.
Have you tried checking it in safe mode? Have you tried doing an operating system reinstallation?
Posted on May 11, 2013
Testimonial: "Hi David, I have tried safe mode but not reinstalling the OS (WIN7ULT). When I first boot up, the screen backlight goes out before booting from the HDD. (I have also updated the BIOS and there is no settings in for the display). I am thinking of trying WIN8 so this should be a good way of ruling out the OS. If I remove the main HDD and use the second HDD and do a complete clean install of WIN8, this hopefully should prove the OS. Thanks "
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Posted on Jan 02, 2017
It means computer developed oxide on some contact, and this is causing a short that forces unit to shut down, laptop must be taken apart, dried properly, and eventually cleaned with circuit cleaning solution.
If problem stops when you turn to external display, then probably it is water or oxide in LCD ribbon cable connectors.
Posted on Aug 10, 2008
If you just replaced the systemboard, the video chip is not likely to be the problem. I would say to check the cable connections and the actual lcd, but you said that the external monitor is not working either and that is not dependent upon the cable or lcd. I would say that your systemboard is probably DOA, but just to be sure do you have another laptop to test it on?
Posted on Mar 21, 2009
You would be well advised to hit F8 and do a safe mode. Then check the disk. More details here: http://annoyances-resolved.blogspot.com/2009/09/laptop-wont-boot-and-shows-blank-screen.html
Posted on Nov 19, 2009
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