Toshiba Satellite LCD Problem

Hi Everyone

I have a Toshiba Satellite P200 and there is a problem with the Display , it works and it does not work .

I have done some checks  ,the backlight is on , and it works ok with a second monitor .

The question I really want to ask is , where is the switch or contact on the Lid or body of the Laptop that shuts down the screen when I close the Lid , I have the Laptop stripped down and I can not see anywhere , where there is some sort of contact mechanical or magnetic between the Lid and Palm rest .

I thought that there me have been something where the Lid Latches close but can not see anything around there  .
I know there must be something that puts the laptop into Hibernate when I close the Lid , but what and where is the sensor or whatever located .

cheers
PS: I do have a Dell Latitude 
spike