Laptop screen won't turn off

[seanguy]

I have a dell 640m and the hinges broke so I got them replaced. It wasn't done by dell, rather, it was done by a little computer shop. When I got it back I noticed that the screen no longer turns off when it is shut. I dont really want to go back to the shop because it's far away and I just don't want to deal with them anymore so I'd rather do it myself. I opened up the cover above the keyboard where the hinges are and I can't seem to find any sort of mechanism or sensor to detect when the screen is closed. Do the hinges themselves do this? And now since I have shady aftermarket hinges is there any hope my laptop screen will ever turn off when it is closed?

 

[stlcardinals]

Here's a link to the service manual, you can double check that everything is connected properly.

http://support.dell.com/support/edocs/systems/ins640m/en/SM/index.htm

 

[seanguy]

Thank you for the suggestion, Ill definitely take a look.