In a dark room start your mac your screen should have a bit of glow. If you don’t see the glow the issue is still the backlight power source and its connection to the LCD. I’m suspecting you got a bad part. You’ll need to replace it again.
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[product|IF173-028]
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[https://www.thebookyard.com/product.php?cPath=34_165_240&products_id=7841|iMac 21.5" LED Backlight Board (used) Apple P/N 661-5976]
Review this guide to see if you missed something: [guide|5957]
In a dark room start your mac your screen should have a bit of glow. If you don’t see the glow the issue is still the backlight power source and its connection to the LCD. I’m suspecting you got a bad part. You’ll need to replace it again.
[product|IF173-028]
Review this guide to see if you missed something: [guide|5957]