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The bottom part of the cable could be found either under the keyboard or keyboard bezel.In order to remove and replace the LCD cable, it will be necessary to disassemble the whole laptop. The image on the screen appears normal until you move the display up or down. In many cases the video cable failures are very similar to the LCD screen failures.When you press on the power button the laptop powers up but will not start. If the power LED lights up it indicates that the laptop is getting power from the AC adapter.Most likely there is nothing wrong with the adapter but just in case test it with a voltmeter to make sure the output voltage is correct. Unplug the AC adapter, remove the battery and wait for 1-2 minutes. Try reseating the memory module, just remove it from the slot on the motherboard and install it back.On the picture you can see a typical laptop video cable. One end plugs into the connector on the back of the LCD screen, the second end plugs into the inverter board, the third end plugs into the connector on the motherboard or video card.The top part of the cable runs inside the laptop display panel between the LCD screen and display cover.
If you have two memory modules installed, try removing them one by one and start the laptop just with one memory module installed.
I noticed that in some cases the laptop screen may turn white because of poor connection between the video cable and the LCD screen.
If you want to check this connection, you’ll have to take apart the display panel because the connector is located on the back side of the LCD screen. If reconnecting the video cable doesn’t help, most likely you have a problem either with the LCD screen or with the motherboard.
On Toshiba laptops you can toggle between internal and external screens using Fn F5 keys. It’s possible that you have to use a different key combination on your laptop but you get the idea.
Hold down Fn and press on F5 until you get video on the external monitor. On some laptops, in order to be able to use the external monitor, you have to connect it to the laptop and then restart the laptop so the external monitor is detected by the laptop.
If you have to replace the AC adapter, make sure you use a correct one.