The customer complained that his Toshiba Satellite A70 laptop doesn’t have video on LCD but the screen lights up when he turns on the laptop.
Laptop diagnostics and repair:
The laptop started without any video on the LCD screen, but the backlight lighted the screen. When you have a problem like this, always try to connect the laptop to an external monitor. If the external video is fine, then most likely the system board or the video board in the laptop are fine and the problem is somewhere between the LCD screen and the system board. I connected the laptop to an external monitor and got a normal video output. To find the problem, I opened up the laptop display assembly and found that the video cable on the back of the LCD screen was half way out. After I reseated the display video cable, the laptop started with the internal video.
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