I would focus on the cables and the connectors. How about taking some good clear tight shots of the cable ends and the connectors on the logic board side and the display side so we can see what they look like [guide|21499]
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Refer to this guide [https://www.ifixit.com/Guide/iMac+Intel+21.5-Inch+EMC+2428+Display+Replacement/5952] Steps 5, 6, 7 &8
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Refer to this guide [guide|5952] Steps 5, 6, 7 &8
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=== Update (01/30/2021) ===
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@Corbin Titus - Still not sure, but lets assume the cables and connections are OK. Then we need to assume the issue is within the logic board backlight power circuit.
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[image|2314571]
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[image|2314572]
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Using a DVM and a boardview drawing test the three MOSFET’s I’ve shown you here. IF this is beyond your skill set you’ll need to find someone locally to help you.
I would focus on the cables and the connectors. How about taking some good clear tight shots of the cable ends and the connectors on the logic board side and the display side so we can see what they look like [guide|21499]
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Refer to this guide [https://www.ifixit.com/Guide/iMac+Intel+21.5-Inch+EMC+2428+Display+Replacement/5952] Steps 5, 6, 7 &8
I would focus on the cables and the connectors. How about taking some good clear tight shots of the cable ends and the connectors on the logic board side and the display side so we can see what they look like [guide|21499]