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820-00609-A Apple iMac 27" 5K Retina

Thanks. There are 5 diagnostic LED's on the logic board. On the original bios 2 diagnostic LED were on. With the new bios 3 LEDs are on so it's better but still no display... Any ideas?
 
Hello friends, hoping that everyone enjoys excellent health and work, my situation is the following after several days of reviewing this team iMAC-27 A1419 EMC2834 I do not find the fault and decided to upload two small videos to know if someone has met this kind of problem and can you guide me please; With what can it be. I was reballing ic video and screen replacement. Thank you in advance for your recommendations. Thank you.WhatsApp Image 2019-09-23 at 6.21.09 PM.jpeg
 

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