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Versión actual por: Dan ,

Título:

iMac does not power ON

Texto:

Hi,
 
I have a Power issue with my imac mid 20112011 iMac.
I have a Power issue with my imac mid 20112011 iMac.
 
IveI've already opened it up. I have experience with repairing electronics, etc. But now i'm stuck;stuck. On the logic board ( Main board) :
* Diagnostic LED 1 goes ON, this seems a power-OK led to me, I measure 12v on the supply.
* If I press the power button nothing happens.
* I detached all peripherals, sdcardreader, camera, audio, hdd, speakers, etc. Still nothing.
* I checked the power button, the button and cables are OK.
* I can also measure 12v on the logic board.
IveI've already opened it up. I have experience with repairing electronics, etc. But now i'm stuck;stuck. On the logic board ( Main board) :
* Diagnostic LED 1 goes ON, this seems a power-OK led to me, I measure 12v on the supply.
* If I press the power button nothing happens.
* I detached all peripherals, sdcardreader, camera, audio, hdd, speakers, etc. Still nothing.
* I checked the power button, the button and cables are OK.
* I can also measure 12v on the logic board.
 
On the logic board ( Main board) :

Diagnostic LED 1 goes ON, this seems a power-OK led to me, I measure 12v on the supply.

If I press the power button nothing happens.

I detached all peripherals, sdcardreader, camera, audio, hdd, speakers, etc. Still nothing.

I checked the power button, the button and cables are OK.

I can also measure 12v on the logic board.

Question:

What
Questions:
* What
can keep it from powering on, what does it need?

Does

* Does
it need memory in the banks to power on, ( LED #2) ?

Could

* Could
it be a faulty CPU or GPU, does it need that to power on?

Do

* Do
all the sensors have to be connected?

Could

* Could
I detach the video card an test power without it?
On the logic board ( Main board) :

Diagnostic LED 1 goes ON, this seems a power-OK led to me, I measure 12v on the supply.

If I press the power button nothing happens.

I detached all peripherals, sdcardreader, camera, audio, hdd, speakers, etc. Still nothing.

I checked the power button, the button and cables are OK.

I can also measure 12v on the logic board.

Question:

What
Questions:
* What
can keep it from powering on, what does it need?

Does

* Does
it need memory in the banks to power on, ( LED #2) ?

Could

* Could
it be a faulty CPU or GPU, does it need that to power on?

Do

* Do
all the sensors have to be connected?

Could

* Could
I detach the video card an test power without it?
 
The thing is I don't feel like replacing the logic board, its to expensive, I just wondered if there is any information about the "logic" which turns on the power, could I override it, so I can see where the smoke comes from ? :)..
 
TNX!!

Regards,

Guido

Regards, Guido
TNX!!

Regards,

Guido

Regards, Guido

Dispositivo:

iMac Intel 21.5" EMC 2428

Estatus:

open

Editado por: originalmachead ,

Título:

iMac does not power ON

Texto:

Hi,

I have a Power issue with my imac mid 2011.

Ive already opened it up. I have experience with repairing electronics, etc. But now i'm stuck;

On the logic board ( Main board) :

Diagnostic LED 1 goes ON, this seems a power-OK led to me, I measure 12v on the supply.

If I press the power button nothing happens.

I detached all peripherals, sdcardreader, camera, audio, hdd, speakers, etc. Still nothing.

I checked the power button, the button and cables are OK.

I can also measure 12v on the logic board.

Question:

What can keep it from powering on, what does it need?

Does it need memory in the banks to power on, ( LED #2) ?

Could it be a faulty CPU or GPU, does it need that to power on?

Do all the sensors have to be connected?

Could I detach the video card an test power without it?

The thing is I don't feel like replacing the logic board, its to expensive, I just wondered if there is any information about the "logic" which turns on the power, could I override it, so I can see where the smoke comes from ? :)..

TNX!!

Regards,

Guido

Dispositivo:

iMac Intel 21.5" EMC 2428

Estatus:

open

Editado por: originalmachead ,

Título:

iMac does not power ON

Texto:

Hi,

I have a Power issue with my imac mid 2011.

Ive already opened it up. I have experience with repairing electronics, etc. But now i'm stuck;

On the logic board ( Main board) :

Diagnostic LED 1 goes ON, this seems a power-OK led to me, I measure 12v on the supply.

If I press the power button nothing happens.

I detached all peripherals, sdcardreader, camera, audio, hdd, speakers, etc. Still nothing.

I checked the power button, the button and cables are OK.

I can also measure 12v on the logic board.

Question:

What can keep it from powering on, what does it need?

Does it need memory in the banks to power on, ( LED #2) ?

Could it be a faulty CPU or GPU, does it need that to power on?

Do all the sensors have to be connected?

Could I detach the video card an test power without it?

The thing is I don't feel like replacing the logic board, its to expensive, I just wondered if there is any information about the "logic" which turns on the power, could I override it, so I can see where the smoke comes from ? :)..

TNX!!

Regards,

Guido

Dispositivo:

iMac Intel 21.5" EMC 2428

Estatus:

open

Aporte original por: guido ,

Título:

iMac does not power ON

Texto:

Hi,

I have a Power issue with my imac mid 2011.

Ive already opened it up. I have experience with repairing electronics, etc. But now i'm stuck;

On the logic board ( Main board) :

Diagnostic LED 1 goes ON, this seems a power-OK led to me, I measure 12v on the supply.

If I press the power button nothing happens.

I detached all peripherals, sdcardreader, camera, audio, hdd, speakers, etc. Still nothing.

I checked the power button, the button and cables are OK.

I can also measure 12v on the logic board.

Question:

What can keep it from powering on, what does it need?

Does it need memory in the banks to power on, ( LED #2) ?

Could it be a faulty CPU or GPU, does it need that to power on?

Do all the sensors have to be connected?

Could I detach the video card an test power without it?

The thing is I don't feel like replacing the logic board, its to expensive, I just wondered if there is any information about the "logic" which turns on the power, could I override it, so I can see where the smoke comes from ? :)..

TNX!!

Regards,

Guido

Dispositivo:

iMac Intel 21.5" EMC 2428

Estatus:

open