Chosen Solution
Looking for schematics of the logic board of a 2017 27” iMac. Symptoms are black screen at start up and fan at full speed. 4 (rather 3.5) out of 5 diagnostic LEDs are lid but there is 0 signal from the LCD. I am trying to see if i have failed fuses F4400 or F8100 as of the Technician Service Manual. But i cant really exactly make out which components are the right ones. Schematics would help me a lot here. Thanks!
found the f4400 fuse that is the display fuse on third page that you posted it is number 5 look there and the f8100 fuse is number 24 on the sheets you put on hope that helps
It looks like you gave us a good clue! It does look like the 2017 follows the Late 2014 & 2015 models. Here’s the clue you gave
And here’s the 2014 logic board with the Fuse ID’ed
As to its value I just don’t know! You still have a SMC issue which is why your fan is running hard.
Do you have the page with items 6 through 13 listed? Thank you very much
Hi, Same problem here, exept the lcd is working but NO backlight ! I try to find the location for the backlight fuse (F8100). Thanks :P
