Probably not a lid switch related problem. In the more modern Toshiba's, the lid-close switch is generally located either above the keyboard area or underneath the front end of the palmrest (towards you), and the lid-close function is activated by a magnet located either above or below the screen. Best way to check if the lid-close function is working properly is to use Toshiba's power management to set the system to go to either stand-by or hibernation upon lid-close - and if the computer goes to stand-by or hibernation when you shut the lid, then that part is functioning properly.
A better, more detailed and precise description of the problem with the screen will probably help in addressing the real problem.
One of four things possible, bad lcd bulb, bad inverter that powers the bulb, or bad mainboard that powers the inverter (rare problem).... and sometimes, bad lcd cable, also rare.
To test, you need a good bulb to plug into this inverter and see if it lights. If it doesn't, then your problem is most likely a bad inverter board. Simply shop online somewhere like eBay to find a replacement. Generally they cost around $30 USD shipped. And you can find it located in the lid, at the bottom of the lcd. You will need to remove any screws in the plastic bezels and carefully pop the bezel off to gain access to it.
One other thing I should mention, I have seen some laptops that have an lcd cutoff switch, or hibernate switch. When you close the lids, its will either put the laptop into a standby state, or it will simply turn the backlight off on the lcd. I've seen those switches get stuck. Note - not all laptops have them.
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