iMac lcd screen will not light up REALLY NEED YOUR HELP!!!

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Apple iMacå27” i7 2011 3.4 Ghz

Only 3 led lights will come on!
I put in new power supply!
I put in new backlight board!
I bought another monitor!
I got new 3 new ribbons.

Computer starts with external monitor works fine.
I while ago I put in monitor ribbon that has a pin missing it went black after a few minutes.
Since then the screen will not light up.
I tried everything I can think of…
Have you ever run into this or heard of this problem.

So I’m thinking it the old ribbon did something to the motherboard.
I took out motherboard it looks good no bulging capacitors or leaks but i did notice a little white residue on front of motherboard under 2 capacitors.
very little.

I’’m trying to fix this myself never done this before.
I have been working on it for months learning as I go…..
Any ideas.
I am really getting depressed over this.
I don’t have anymore money I live on fixed income.
This is the only computer I have.

I appreciate your interest I am not a technician DYI
In fact I’m using it with my tv monitor now!

Howard:
 

chscag

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Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
Welcome to our forums.

You might want to go to www.ifixit.com and take a look at their take apart and fix instructions. Good luck.
 

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