Is PA-1311 the right PSU for iMac 27" 2020 model?

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iMac Intel 27" Retina 5K Display 2020

A2115/2020 / 프로세서 3.1GHz 6코어 i5부터 최대 3.8GHz 8코어 i7까지. 2020년 8월 4일 출시.

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Tom @lovecd

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Is PA-1311 the right PSU for iMac 27" 2020 model?

Trying to buy PSU for my iMac 27" 2020 desktop, but found several model numbers on the market, so, just want to buy the right one, should PA-1311 2A2 good? Any thoughts?

Thanks,

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Dan @danj

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The iFixit parts listing shows this as the needed unit for this system

So as you can see that is the correct unit for your system.

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@Dan - Thanks Dan. By the way, a question though, after replacing the GPU, what's the proper way to get power connected in order to avoid short or burnt on GPU board?

Thanks,

Tom 의 2023년 8월 26일

@lovecd - Are we taking about the 2020 27” 5K iMac? There is no GPU board in the newer systems. The last series to have a MXM GPU board was the 2011 systems.

Review this guide iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement

Dan 의 2023년 8월 26일

Sorry Dan, I was referring to PSU board, not GPU. I heard some stories that the PSU board is shortened if not connecting power cord correctly. Any suggestions?

Tom 의 2023년 8월 26일

@lovecd - There was a bad run of PSU’s which had the neutral and ground lines mis-wired! I would recommend you work on an insulated bench and use an isolation transformer it you are doing this for a living.

After you put things together enough to test things I would take a Volt meter testing the chassis ground to the outlets neutral and ground points. You should not see voltage on either (hot side for sure).

Other than that I haven’t encountered any issues!

Dan 의 2023년 8월 27일

@danj — thanks Dan!

Tom 의 2023년 8월 27일

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@Dan - Thanks Dan. By the way, a question though, after replacing the GPU, what's the proper way to get power connected in order to avoid short or burnt on GPU board?

Thanks, — Tom
@lovecd - Are we taking about the 2020 27” 5K iMac? There is no GPU board in the newer systems. The last series to have a MXM GPU board was the 2011 systems.

Review this guide iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement — Dan
Sorry Dan, I was referring to PSU board, not GPU. I heard some stories that the PSU board is shortened if not connecting power cord correctly. Any suggestions? — Tom
@lovecd - There was a bad run of PSU’s which had the neutral and ground lines mis-wired! I would recommend you work on an insulated bench and use an isolation transformer it you are doing this for a living.

After you put things together enough to test things I would take a Volt meter testing the chassis ground to the outlets neutral and ground points. You should not see voltage on either (hot side for sure).

Other than that I haven’t encountered any issues! — Dan

iMac Intel 27" Retina 5K Display 2020

Is PA-1311 the right PSU for iMac 27" 2020 model?

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