Test points logic board on macbook pro a1278

Hi all,
I have recently come across a unit that seems to power up but i get no image from the LCD or an external monitor. 
I did disconect the dvd drive and the fan on the motherboard came on, which is nice, but still no image.
My questions:
Is there a way to test (DMM) to see if the data video cable or inverter are the culprits?
Are they tests points on the logic board  I can measure to see if I can pinpoint what circuit is causing this behavior?
Any help or suggestions are greatly appreaciated!
Thanks!
Nate

If you weren't able to de-authorize your MBP before sending it in for the logic board to be replaced, I don't believe you can reset or de authorize all currently authorized computers until you reach or authorize 5 computers. You can then do a complete reset or de-authorize all authorized computers followed by re-authorizing the computer you are currently using.

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