System hangs on boot, if it boots it hangs soon. What to check?

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iMac Intel 21.5インチ EMC 2638/EMC 2742 修理

Model A1418 / Late 2013 / 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 プロセッサ

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mbed @mbed

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投稿日: 2022年1月8日

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System hangs on boot, if it boots it hangs soon. What to check?

Has been running reliably since @dan helped me last year with thermal paste issues. Suddenly the system will hang partially through a status bar or if it goes to user menu, it will let you log in but it will either hang within a few minutes or begin a restart cycle.

Tried to go into safe mode and it hangs there also. Tried recovery mode, started disk utility to check ssd and on pass 3 of 7, it froze!

A few times, a crackling quick pop was heard briefly…what should I focus on power supply? logic board? Thanks!

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@mbed - Did you not see my post in your earlier Q?

Dan さんによる2022年1月8日

yes but wondered if it could be other components or is it most likely the logic board? i know it is possible to be psu but is it likely? was pondering buying a pull logic board with faster cpu and also a pull power supply.

other option is to buy a more recent machine but overthinking before deciding? the 21.5" 2019 4k seems to be most upgradeable or the 2017?

would swap the ssd in the 2013 to the newer one if i go that route....would it just boot or are there boot parameters that need to be modified?

mbed さんによる2022年1月10日

the upgrade of the 2013 would be a dead end for it...least expensive solution though. wondering if I just tried the psu? is that worth trying or is it extremely like to be the logic board?

thanks!

mbed さんによる2022年1月10日

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Dan @danj

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投稿日: 2022年1月10日

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Sadly, the logic board is the failure here. Inspecting the onboard diagnostics would help aim you, even still probing the power rails referencing schematics and boardview drawings would be the next thing I would do. But you need the deeper skills to follow them and a good DVM.

As far as swapping out the logic board, you are limited to what this series used. Apple produced two versions one with just the Intel Iris Pro intergraded graphics and the other with the additional NVIDIA GeForce GT 750M dedicated GPU

You can’t use the 4K display models logic board as the board to display connection is different.

But if you are planning on just getting a new system either 2017 or 2019 offer the same ability for upgrading upto 32 GB of RAM, socketed CPU & NVMe/PCIe blade SSD connection.

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yes but wondered if it could be other components or is it most likely the logic board? i know it is possible to be psu but is it likely? was pondering buying a pull logic board with faster cpu and also a pull power supply.

other option is to buy a more recent machine but overthinking before deciding? the 21.5" 2019 4k seems to be most upgradeable or the 2017?

would swap the ssd in the 2013 to the newer one if i go that route....would it just boot or are there boot parameters that need to be modified? — mbed
the upgrade of the 2013 would be a dead end for it...least expensive solution though. wondering if I just tried the psu? is that worth trying or is it extremely like to be the logic board?

thanks! — mbed

iMac Intel 21.5インチ EMC 2638/EMC 2742 修理

System hangs on boot, if it boots it hangs soon. What to check?

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