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(Solved) iMac 2017 A1418 EMC 3069

J

joshAU

Member
Hi again all.
Happy New Year.

I've got a 2017 iMac that was working fine until we pulled it apart to upgrade the hard disk in it.
On reassembly, we now have no backlight.

There's no sign of physical damage to either of the two cables that connect the screen to the logic board, nor to the connectors themselves.

The only fuse nearby tests OK, and reads 12 volts on either side of it.

We've reseated the data cable to the back of the panel.
We've reset the SMC/PRAM.

I do not have the schematics nor boardview for this model.
I don't have a test screen or test logic board that matches this unit unfortunately.

I believe from googling that the model of the logic board is 820-00597-A.
I haven't taken the board back out, and assume the number is on the other side, as I can't locate it on the visible side.

Any suggestions as to where to start?
Thanks for any help you can provide.
 
J

joshAU

Member
Hi again 2informaticos.
Yes, that is correct - image but no backlight.
Can just make out the Apple logo when you turn it on.

With the LCD panel completely disconnected, the unit displays fine on a external monitor connected to USBC.
 
J

joshAU

Member
Hi again 2informaticos.
Sorry for the delay, got sidetracked on other jobs.
Thanks for those files, I appreciate it.

I rechecked all the connections without success, so I ended up ordering an new panel, and voila, its working.
I'm not sure what happened with the original panel, as I wasn't the one who removed it, but I suspect it still had power going to it when it was removed?
Anyway, all good, and thanks again for your help!
 
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