iMac Black Screen No Chime Led 1 Fans Rev

Question

iMac Intel 21.5" EMC 2428

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

432 questions Voir tout

tomytom @tomytom

Rep: 25

3

Publié: 9 oct. 2022

Options

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

Répondre à cette question J'ai le même problème

Cette question est-elle utile ?

Oui Non

Indice 2

Ajouter un commentaire

1 Réponse

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

Réponse la plus utile

Ben Capehart @beanman56

Rep: 7,3k

32

17

34

Publié: 9 oct. 2022

Options

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: Installation d'une carte mère dans l'iMac Intel 21,5" EMC 2428 iMac Intel 21.5" EMC 2428 CPU Replacement

Tutoriel

iMac Intel 21.5" EMC 2428 CPU Replacement

Difficulté :

Difficile

—

3 - 5 hours

Tutoriel

Installation d'une carte mère dans l'iMac Intel 21,5" EMC 2428

Difficulté :

Difficile

—

1 - 4 hours

Cette réponse est-elle utile ?

Oui Non

Indice 4

61 commentaires:

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 oct. 2022 par tomytom

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

10 oct. 2022 par Ben Capehart

@beanman56

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

13 oct. 2022 par tomytom

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

@oldturkey03 - Any thoughts?

13 oct. 2022 par 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 oct. 2022 par Dan

Voir 56 commentaires en plus