My toshiba portege 7020ct's problem is only haft sreen that appear everytime open it
This is generally associated with a bad backlight or inverter. Some have had success testing for a bad inverter using a multimeter.
If you have one on hand, holding the leads about an inch apart and moving them around about an inch away from the screen (while it is on) will pick up a small magnetic field and give a positive reading on the meter if the inverter still works.
Assuming you don't have a warranty or don't want to send it in, the most effective way to test each part is to swap them for working parts. LCDparts.net is a good resource for diagnosing parts and ordering what you need (should you decide to do it yourself). Fortunately, they offer exchanges if, say, you order an inverter but you needed a new backlight lamp.
Hope this helped a bit.
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