Re: 820-00134-A iMac 27" Late 2015 - No display, backlight works

Sorry for double posting but I managed to "fix" the display. Maybe someone will have the same issue and comes across this thread via google.

My screen was completely dead - no backlight or image at all. I tried flashing directly at the screen with a flashlight and got nothing. The diagnostic LEDs only showed 2 green lights.

I noticed F4400 fuse on the logic board was blown. It's 32V 2A fast acting fuse. Mine was welded to the board and I had to use a lot of force to remove...

Hello
I received 27" iMac, Late 2015 model that's broken. I don't know what exactly happened but it appears to be unopened and there are no marks indicating prior repair attempts.
Initially it didn't display anything on the screen and backlight didn't work. Only 2 diagnostic LEDs would light up and 3rd was very faint. I opened it and found F4400 fuse near eDP connector to be blown. Replaced it with a suitable part and backlight came back to life. Unfortunately it still doesn't display anything on the screen. Now I get 4 green diagnostic LEDs.

I can hear the chime...

Re: New Members - please post your introductions here

Hello,

Came across this forums when I googled for N64 power supply fault and this was the only place that carried any technical information on my particular power brick.

Hello everyone