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Blank Screen after DC in Power Board Replacement

I have a mid-2012 macbook pro that was working fine except that the magsafe had to be wiggled to charge and it would really heat up sometimes. The power board was looking pretty beat up. So I bought a new DC in Power Board (made by Apple - identical to the old one) and replaced it per https://www.youtube.com/watch?v=hGHov4t3.... When I booted up, I would get the chime, keyboard would light, but blank screen. Apple logo on outside cover does not light and shining a light thru it does not show my login, so I conclude the backlight does not work. Tried NVRAM/PRAM and SMC resets multiple times w/out success. Tried closing the cover for a while and reopening it w/out success. Removed cover and redid all the connections and checked the cables w/ a magnifying glass to check for damage w/out success. Even replaced the original DC in Power Board and triple checked all connections w/out success. Also tried to hook up an external monitor but no success. Any ideas? Thanks.

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Probably component got knocked

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Could you be more specific?

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check for any missing smd component near display connector

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Thanks. I was pretty careful when I removed the MB but attached is a pic of the area.

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Do you see any damaged or missing SMDs?

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So after looking at my last comment I can see that it might appear to be confrontational. Honestly, I didn't mean it that way and am just trying to figure out the problem and would appreciate any insight.

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i don't have same board to compare with. if no picture on external monitor too, must be issue with display circuit.

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DIYer zal eeuwig dankbaar zijn.
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