Toshiba Satellite P100 screen Inverter replacement;
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An LCD screen cannot produce light. It needs an additional light source.
A Backlight is the additional light source.
A Backlight (Present technology) is a CCFL, or a series of LED lights.
The Toshiba Satellite P100 series of Notebook PC's uses a CCFL.
Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.
Average size is approximately 2mm Thick, and the length is close to the height of the LCD screen. 2mm is a little larger than 1/16th of an inch.
This means the CCFL can be broken quite easily, as it is fragile. (You also DO NOT want to be cut by a Fluorescent lamp )http://www.laptoprepair101.com/laptop/2007/12/09/replace-laptop-backlight-ccfl-lamp/
A screen Inverter converts the power from the laptop, for the Backlight, and LCD screen.
As previously stated in a Clarification, 90 PERCENT OF THE TIME the fault is the screen Inverter.
(I never request commendations, but thank you for offering.
We, the older techs here, feel that is begging.
3 years at FixYa so far.