iMac Black Screen No Chime Led 1 Fans Rev

Question

iMac Intel 21.5" EMC 2428

Modello A1311 / Metà 2011 / Processore Core i5 da 2,5 e 2,7 GHz o Core i7 da 2,8 GHz

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tomytom @tomytom

Rep: 25

3

Postato: 9 ott 2022

Opzioni

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.

@danj

This is the gpu

The specs

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Ben Capehart @beanman56 Rep: 7,3k 32 17 34 · Answer 1 · 2022-10-09T22:42:59-07:00

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Ben Capehart @beanman56

Rep: 7,3k

32

17

34

Postato: 9 ott 2022

Opzioni

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: Installazione della scheda logica nell'iMac Intel EMC 2428 da 21,5" iMac Intel 21.5" EMC 2428 CPU Replacement

Guida

iMac Intel 21.5" EMC 2428 CPU Replacement

Difficoltà:

Difficile

—

3 - 5 hours

Immagine iMac Intel 21.5" EMC 2428 Scheda Logica

Guida

Installazione della scheda logica nell'iMac Intel EMC 2428 da 21,5"

Difficoltà:

Difficile

—

1 - 4 hours

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61 Commenti:

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.

10 ott 2022 da tomytom

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

10 ott 2022 da Ben Capehart

@beanman56

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

13 ott 2022 da tomytom

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

@oldturkey03 - Any thoughts?

13 ott 2022 da Ben Capehart

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

14 ott 2022 da Dan

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