logic board

[woois00]

My I mac 2017 21.5 (i5 3.0G) still black screen.
This is error procedure.

1. Try to Big sur update.
2. During Big sur update, power shut down( by my son)
3. boot fail ( black screen)
4. Logic board LED #3 off
LED 3 - Indicates that the computer and the video card are communicating. This LED will be ON when the computer is communicating properly with the video card. If LEDs 1 and 2 are ON and you heard the startup sound, but LED 3 is OFF, then the video card might be installed incorrectly or need replacement.


Try to repair.

1. PRAM reset - Fail
2. PRAM battery replace - Fail

Is this case need to replace logic board ?

If someone know that this issue, please let me know.

 

[Anonymous Freak]

This would be better in the iMac or Mac Help subforums, since this is the Apple Silicon forum for the new M1 Macs.

 

[woois00]

Thanks for your reply, I will change to forum.

This would be better in the iMac or Mac Help subforums, since this is the Apple Silicon forum for the new M1 Macs.