Macbook Pro No POST after LCD Replacement

MacBook Pro A1398 EMC 2674 does not display video after LCD replacement.

I am pretty sure I followed everything correctly, but yet here I am.  The new (used) screen I got for this model (SN: C02MT1KJFD58) for this MacBook Pro 15" Late 2013? model is part number 661-8310.  I don't know where to find that part number on the original screen.  Anyways, the old screen was busted, but would still light up.  Now that I have attempted to put on the new screen, I can see the screen momentarily flash (as if it is on with no backlight), but nothing displays that I can ACTUALLY see with a  flashlight.  Also, the HDMI connection displays nothing and the unit seems to power itself down after a bit.  Also, if you plug the magsafe in, it automatically turns on.  Is that normal?  I have tried hooking the old screen back up to it, but I also get no display.  HOWEVER, we attempted to remove JUST the glass from the old screen, so we may have damaged it. :(  Suggestions on how to get the new screen to work?
LVL 8
Scott ThompsonComputer Technician / OwnerAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

serialbandCommented:
That's not normal.  Double check your wiring.
Scott ThompsonComputer Technician / OwnerAuthor Commented:
I have disconnected and reconnected the battery, the LCD cable, the iSight? cable, and cleaned the MagSafe connector.  No difference.
Scott ThompsonComputer Technician / OwnerAuthor Commented:
I may have to return the screen unless anyone else has an idea.  The supplier verified with me and the serial number that this is the correction screen.  Any other ideas?
Bootstrap 4: Exploring New Features

Learn how to use and navigate the new features included in Bootstrap 4, the most popular HTML, CSS, and JavaScript framework for developing responsive, mobile-first websites.

fred hakimRetired ITCommented:
As said above, double check your screen connections.  If the new screen is good, it sounds like a skewed connector could be shorting one of the voltages.   If the new screen is bad, then the old screen should still light up (as it used to).

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Scott ThompsonComputer Technician / OwnerAuthor Commented:
I reinstalled the old screen again just to test, and this time it lit up (the undamaged part) and the system passed POST.  We are assuming the new screen is the issue.  Thank you for your help!
fred hakimRetired ITCommented:
Wouldn't hurt to try the new one one more time, just to be sure it wasn't a skewed connection.   Those little connectors are easy to mis-align -- especially if you have big fingers like me.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Apple Hardware

From novice to tech pro — start learning today.