hi to all...

Hi,

I have this laptop for a long time, still it does it's job, like browsing, word , excel. Two years back laptop Hinge base broken but now it's damaging other parts of laptop so I tried to totally remove the embedded display cable from laptop and tried to boot only with external display monitor, but it doesn't boot and gives single beeps. BIOS checking the embedded display to be connected.
So checked the schematics to bypass this issue.
Found something but I don't know how to read this schematics.

Dell 3537 mobo 9982p rev 3

Schematics attached,...