iMac gets Power but won't turn on

Question

iMac Intel 21.5インチ EMC 2389

モデル番号A1311 / Mid 2010 / 3.06 & 3.2 GHz Core i3もしくは3.6 GHz Core i5プロセッサ

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Karneta @karneta

評価: 11

投稿日: 2019年1月13日

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iMac gets Power but won't turn on

Original issue: No picture over built in and external monitor.

Current issue: Won’t turn on - But holding power on button while plugging in let’s the fans run at 100%.

What led to from issue 1 to 2: According to the internet baking the gpu could fix the soldier points (eg broken ones). In my case a resistor came off and i had to solder it back on.

After putting everything together, the iMac won’t turn on. LED1 on the logic board is illuminated. Disassembled, reconnected everything and reassembled it, but the iMac still won’t turn on - other LEDs are still off and fans are not spinning.

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Dan @danj

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投稿日: 2019年1月13日

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Sorry your GPU board is gone you’ll need to replace it. The oven trick doesn’t always work as you’ve discovered.

Here’s your options:

AMD Radeon HD 6750M 512 MB - 661-5944
AMD Radeon HD 6770M 512 MB - 661-5945

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Thx for your anwser!

But do you know if the logic board could be also faulty since it won’t power on anymore? The iMac worked “flawlessy” with only issue #1 - Managed to open a Youtube video without any screen and got the sound.

Karneta さんによる2019年1月13日

The problem is you can't un-crack an egg here. I would have done some additional testing before going down the path you took.

But from what you are telling me the conditions at the start and the conditions after baking your GPU is different and you had a component fall off the GPU so I surmise you over did the bake. Even if you did it correctly there was a good chance it wouldn't work.

Hence we need to fix this first. Hopefully, that solves the original problem as well.

Dan さんによる2019年1月13日

Then i'll try tto find a cheap spare gpu - or another defect iMac 2010.

Thx for your time.

Karneta さんによる2019年1月13日

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Thx for your anwser!

But do you know if the logic board could be also faulty since it won’t power on anymore? The iMac worked “flawlessy” with only issue #1 - Managed to open a Youtube video without any screen and got the sound. — Karneta
The problem is you can't un-crack an egg here. I would have done some additional testing before going down the path you took.

But from what you are telling me the conditions at the start and the conditions after baking your GPU is different and you had a component fall off the GPU so I surmise you over did the bake. Even if you did it correctly there was a good chance it wouldn't work.

Hence we need to fix this first. Hopefully, that solves the original problem as well. — Dan
Then i'll try tto find a cheap spare gpu - or another defect iMac 2010.

Thx for your time. — Karneta

iMac Intel 21.5インチ EMC 2389

iMac gets Power but won't turn on

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