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Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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iMac Black Screen No Chime Led 1 Fans Rev

Hi There.

I have a problem a back screen issue.

The fans turns on with the hdd and DVD drive.

I checked the onboard diagnostics and LED 2, 3 and 4 are off.

I have replaced the PSU but but still a black screen.

I have replaced the cmos battery but still black screen.

I have baked the gpu but still black screen.

Ask for any info about Imac.

Edit.


I forgot to mention I plugged in a different keyboard when it was working and when 15 min past it crashed and I could turn it on but it would crash less then 10 min in it would crash. The next day it would not turn on I have the issue now.

Update (01/08/2023)

@danj

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This is the gpu

Update (01/08/2023)

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The specs

Answer this question I have this problem too

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1 Answer

Most Helpful Answer

Sounds to me Like A Scary failed logic Board Or CPU!

Take it The board out and look for any corrosion,
And Check The CPU

Guide: iMac Intel 21.5" EMC 2428 Logic Board Replacement iMac Intel 21.5" EMC 2428 CPU Replacement

iMac Intel 21.5" EMC 2428 CPU Image

Guide

iMac Intel 21.5" EMC 2428 CPU Replacement

Difficulty:

Difficult

3 - 5 hours

iMac Intel 21.5" EMC 2428 Logic Board Image

Guide

iMac Intel 21.5" EMC 2428 Logic Board Replacement

Difficulty:

Difficult

1 - 4 hours

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61 Comments:

I forgot to mention I plugged in a different keyboard when it was working and when 15 min past it crashed and I could turn it on but it would crash less then 10 min in it would crash. The next day it would not turn on I have the issue now.

by

Hmm... I'd say try reseating the CPU.

by

@beanman56

It didn't work I reseated the CPU. Still doesn't work.

by

@tomytom - Okay sounds like a faulty logic board then...

@oldturkey03 - Any thoughts?

by

@beanman56 - Often I find the GPU power rail is shorted to ground. Inferring a short with in the GPU board likely a burnt cap.

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