iMac Black Screen No Chime Led 1 Fans Rev

Question

iMac Intel 21.5" Mitte 2011

Modell A1311 / Mitte 2011 / 2.5 & 2.7 GHz Core i5 oder 2.8 GHz Core i7 Prozessor

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tomytom @tomytom

Rep: 25

3

Veröffentlicht: 9. Okt 2022

Einstellungen

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

Diese Frage beantworten Ich habe das gleiche Problem

Ist dies eine gute Frage?

Ja Nein

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1 Antwort

Ben Capehart @beanman56 Rep: 7,2 Tsd. 32 17 34 · Answer 1 · 2022-10-09T22:42:59-07:00

Hilfreichste Antwort

Ben Capehart @beanman56

Rep: 7,2 Tsd.

32

17

34

Veröffentlicht: 9. Okt 2022

Einstellungen

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 austauschen iMac Intel 21,5" EMC 2428 CPU austauschen

Anleitung

iMac Intel 21,5" EMC 2428 CPU austauschen

Schwierigkeitsgrad:

Schwierig

—

3 - 5 hours

iMac Intel 21.5" EMC 2428 Logic Board Bild

Anleitung

iMac Intel 21.5" EMC 2428 Logic Board austauschen

Schwierigkeitsgrad:

Schwierig

—

1 - 4 hours

War diese Antwort hilfreich?

Ja Nein

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61 Kommentare:

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. Okt 2022 von tomytom

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

10. Okt 2022 von Ben Capehart

@beanman56

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

13. Okt 2022 von tomytom

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

@oldturkey03 - Any thoughts?

13. Okt 2022 von 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. Okt 2022 von Dan

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