iFixit - Answers With Device "iMac"

iMac Intel 27" EMC 2639: 开机黑屏，不停的当，当，当的响声

Mon, 18 Aug 2025 09:57:56 -0700

2019年更新到新系统后，发现开机问题。

根据网上进行reset pram, smc, 都无法恢复

请教各位

⟐ Answered 八月 18, 2025 at 9:57 GMT-7

iMac Intel 27" EMC 2639: iMac 27 late2012,螢幕出現白屏無法開機，不知為何原因

Sun, 24 Nov 2024 21:42:27 -0700

原來是smc佔據大量cpu導致系統緩慢，後來卻完全無法開機

iMac Intel 21.5" Retina 4K Display 2019: I hope to see the replacement ssd and ram tutorial

Tue, 24 Sep 2024 20:24:52 -0700

替换ssd和ram，但是没有教程，不敢启动，请给指点，或者给我一些建议，谢谢。

⟐ Answered 九月 24, 2024 at 20:24 GMT-7

iMac Intel 21.5" Retina 4K Display (2015): iMac 顯示屏有一條垂直線

Tue, 16 Oct 2018 08:58:27 -0700

iMac 顯示屏有一條垂直線. 有大大有方法維修嗎？

我只用了一年多

iMac Intel 27" Retina 5k Display: iMac 27" 5k 2015 主機板能升級 iMac 27" 2017 的主機板嗎?

Sun, 16 Sep 2018 19:23:30 -0700

我能將 imac 27" 5k 2015 主機板升級使用 imac 27" 2017 的主機板嗎?

iMac Intel 21.5" EMC 2308: LCD Backlight not working = solved

Sat, 27 Jun 2026 12:28:13 -0700

Hi,

I have an iMac 2009, 21,5" which has been working well until last week. First there was some flickering and sometimes a black display. Since yesterday the display seems not to work anymore.

I have found the apple technicians guide for this iMac online and tried some of the solutions described there. I did a SMC/PVRAM Reset, but this did not solve the problem.

To determine if it's the gpu I connected an external monitor -> everyhing working fine on the external monitor.

It seems that the LED backlight isn't working anymore, because if you use a flashlight you can see everything on the internal screen.

I asked at a local repair store but they told me (without looking at the device...) that it was either the LCD panel, which would cost almost 500€/650$ to replace or the SATA/Board (Logic board?) which would even be more expensive.

My question is whether it's possible to determine if it is the logic board, ta cable connection, the Backlight controller or the LCD-Panel.

Thanks fpr your answers,

Max

⟐ Commented 六月 27, 2026 at 12:28 GMT-7

iMac Intel 27" EMC 2429: iMac iSight camera to USB Pinout

Mon, 22 Jun 2026 08:01:07 -0700

Hi all,

I deconstructed my iMac and made it into a functioning external monitor after it broke.

I want to re use the iSense camera by making it a USB device. I have heard of people soldering the cables onto a USB for use. The issue is, there is 7 wires and I am not sure which wires to attach to the USB as they only have 4 connections. I have attached an image.

Thanks in advance

⟐ Commented 六月 22, 2026 at 8:01 GMT-7

iMac Intel 21.5" EMC 2428: Can a 21.5" Mid-2011 iMac be upgraded to an i7 2600?

Sun, 14 Jun 2026 02:13:34 -0700

So my iMac is a 21.5" iMac from Mid 2011 with a core i5 2400S as default, now I know you can upgrade it's processor since it's socketed and that's just what I'm going to do.

But what I don't know is if I can only upgrade to a low power chip (S suffix) or if I can upgrade to a full power desktop chip (no suffix). I've seen people upgrade their i5 2400S 27" iMacs to i7 2600, but I've never seen anyone tried a CPU upgrade on a 21.5" imac before let alone the highest end CPU offering from Apple on the 21.5" Mid-2011 iMac is only an i7 2600S.

Now the performance difference between the i7 2600S and i7 2600 is negligible for me, but the problem is I can't souce any i7 2600S but I can fine loads of people selling their i7 2600.

So if anyone can answer, please do as I will apreciate it greatly and if anyone is selling or knows someone who sells an i7 2600S that can ship to Indonesia please answer too. :) Thanks in advance.

⟐ Commented 六月 14, 2026 at 2:13 GMT-7

iMac Intel 21.5" EMC 3068: Will this Adhesive tape hold, or should I reopen it and redo it?

Tue, 09 Jun 2026 01:56:17 -0700

Hello I have ordered the iMac 21,5 2017 HDD replacement kit. I replaced the HDD with a crucial SSD and cleaned off the old adhesive and with isopropal cloths aswell.

Turns out iFixit sent me one too many adhesive stripes of the same type and left the other one out. Iam missing the 02 adhesive strip and have the 01 adhesive strip two times.

I have now cut it in proper form and was wondering if I would have to redo this job once ifixit will provide replacement.

I couldnt leave it open and the glass laying around as I got a little kid at home.

here are some Images:

looking forward to your replies. I really dont want to do this again. It seems like it would only be 2/3% of the adhesive strip missing, I personally think its fine as it will stand on a desk and be rarely touched.

Thanks in advance!

⟐ Commented 六月 09, 2026 at 1:56 GMT-7

iMac Intel 27" EMC 2429: Are there multiple iterations of the 2011 iMac 27in?

Fri, 05 Jun 2026 18:46:38 -0700

I have two 2011 iMacs both 27in, yet I took them apart and the logic board and screen connectors are different. Any ideas on why this is? My screen identifiers are (SD)E3 and (SD)A2 if that helps. They are both A1312 iMac models.

⟐ Edited by author 六月 05, 2026 at 18:46 GMT-7

iMac Intel 27" Retina 5K Display 2019: Connecting new power supply

Wed, 27 May 2026 06:05:17 -0700

I've removed the power supply from this 2019 27 imac and I'm ready to install the new one, there is a cable coming from the power inlet module with an eye connector just beside the bottom upstand right hand side, anybody know where this connects to? is it an earth that is attached to the upstand when screwed in place? Any help would be appreciated, got a pic but can't see how to upload it. Thanks Ted

⟐ Answered 五月 27, 2026 at 6:05 GMT-7

iMac G3 Model M5521: iMac G3 Slot-Loader chimes, then turns off.

Tue, 19 May 2026 03:45:44 -0700

Back in January I got this iMac G3 for pretty cheap. It originally powered on but showed nothing on the CRT.

When I connected an external VGA monitor, I saw it did boot to the “No boot device” screen, which was expected since the original HDD was removed due to failure.

Eventually a MacOS install CD got stuck, so I opened it up and removed it manually. After that, the behavior changed. It now chimes with the green power LED, then as the external monitor briefly detects a signal, it shuts off.

If I try again right after, the power LED comes on but nothing else happens. No chime, no video, nothing until I power it off manually. After unplugging for a few seconds and plugging back in, it goes back to the initial state where it chimes and then shuts off when it should show video on both CRT and external display.

What can I do? I replaced the PRAM battery and it made no difference. It also shuts off before I can do a PRAM reset (Opt+Cmd+P+R), and the physical PRAM button hasn’t helped either.

Trickle voltages seem normal, but when it reaches the “power LED only” state, the down-converter board trickle voltages are lower than normal.

I can also hear the high-voltage crackling as it powers off, so I assume the CRT is receiving power in some way. One other thing of note is that either the speakers, or the down converter board make a high pitched sound, I'll attempt to identify the source later today.

⟐ Commented 五月 19, 2026 at 3:45 GMT-7

iMac Intel 20": Wifi says it's connected but the internet

Mon, 11 May 2026 07:45:53 -0700

The wif says it's connected to the router but the internet doesn't work

⟐ Commented 五月 11, 2026 at 7:45 GMT-7

iMac Intel 27" EMC 2390: planning to upgrade my 10 years old iMac, help in choosing the parts!

Thu, 07 May 2026 22:33:43 -0700

Hi,,

I am planning to upgrade my iMac (27 inch - mid2010) which is now 10 years old and running on El Capitan 10.11.6 OS. Since its having a good CPU (i7 2.93) I am considering replacing the stock HDD (1TB) to an SSD, and maximising the RAM from 8GB to 32GB.

is this upgrade worth it? and will I notice a different when using it?
for the RAM upgrade, I think this part is the best option (iMac Intel 27" (Core i5 or i7) EMC 2390 (Mid 2010) Memory Maxxer RAM Upgrade Kit)?
for the SSD, I was reviewing this guide (Mac Intel 27" EMC 2390 Hard Drive Replacement), and I am confused about the parts options. the SSD Upgrade Bundle with Crucial MX500 SSD 1TB, or buying 2 TB SSD Segate Hybrid 3.5" Hard Drive with all the required tools separately which will almost cost the same. my concerns are:
- is the two SSD mentioned having the same performance?
- is the two SSD mentioned having the same certification with my iMac?
- is there any drawback for using Segate 2TB over Crucial 1TB?

This is my first time upgrading my iMac, and I really appreciate if you can guide me in selecting the best parts to get the most performance out of it for the longest period.

Regards,

⟐ Answered 五月 07, 2026 at 22:33 GMT-7

iMac Intel 27" Retina 5K Display 2020: SDD ribbon cable replacement

Sat, 02 May 2026 11:48:43 -0700

I have a bare 820-01779-A logic board and am trying to identify a small ribbon cable connector on the screen-facing side of the board. There are no SATA connectors on the heatsink side as seen on 2019 boards. Can anyone identify what this ribbon connector is and whether it has any relation to SATA storage?

⟐ Answered 五月 02, 2026 at 11:48 GMT-7

iMac M1 24": Horizontal lines over iMac 24 screen

Sat, 02 May 2026 00:54:57 -0700

Hi,

I got horizontal lines over the display! During the warranty period they replaced the board ( it blacked out ) and now this is happening. They refused to replace the device saying out of warranty and asked to replace it :-|. They were not even sure that changing the display will fix the issue. I am hesitant to replace the screen as I am better off to buy a new one rather keep repairing the faulty product.

Is there any way to fix it?

Tried
- Reinstall the OS
- External Display = Works fine
- Reseating those 3 cables

Lines kind of flickers, may be some lose cables?

Please help

⟐ Commented 五月 02, 2026 at 0:54 GMT-7

iMac: Testing motherboard with no display?

Fri, 01 May 2026 15:24:55 -0700

I've got several 27" iMac motherboards. I have at least 2 that power up and have the startup sound, however I don't have a working LCD. I have two external monitors and I have a display port to DVI cable but when I connect up the external monitor all I get is either a black screen or a "check signal" message.

What am I missing? I thought the display port should function regardless of the presence of the LCD panel or GPU?

⟐ Commented 五月 01, 2026 at 15:24 GMT-7

iMac Intel 27" Retina 5k Display: Is Velcro or 3M Dual Lock a good substitute for display adhesive?

Sun, 26 Apr 2026 19:06:35 -0700

I have an early 2015 iMac with a fusion drive setup where the SSD expired. I plan to replace it with an SSD and use the hard drive from the configuration in an external enclosure. This is an aging system, though, and at some point I plan to convert the iMac into a monitor, so I'd like to be able to access to the internals without buying another set of adhesive strips. I saw a guide on using magnets for this, but it doesn't include any good way to attach the bottom of the screen. I'd like to know if 3M Dual Lock (a stronger Velcro substitute) is a viable alternative to the adhesive, and if so, how much do I need of it to hold the screen on well?

⟐ Commented 四月 26, 2026 at 19:06 GMT-7

iMac Intel: Lots of old parts - what to do with them?

Sat, 25 Apr 2026 05:55:47 -0700

I have several 27" iMacs in various states of disrepair as a result of repeatedly breaking the LCD on mine. What can I do with the parts?

Ideally I'd love to sell them for whatever I can get cause times are hard right? What can I do besides recycle them?

I have parts for 4 complete 27" 2015 iMacs including cases, power supplies, mother boards, speakers, fans, stands, etc....

Most of the electrical components either dont work or I have no way of testing them. I just want to get them off my desk at this point.

⟐ Answered 四月 25, 2026 at 5:55 GMT-7

iMac Intel 27" Retina 5K Display 2019: Microphone is broken after upgrading ssd

Mon, 20 Apr 2026 15:15:48 -0700

Any idea where i can get that part?

the ribbon is so fragile, looks like it broke

thanks

After changing the microphone for a new one it is still the same problem, no idea what happened, i was being very careful inserting the flex cable on the board.. when removing the original one i pulled it instead of removing the tiny latch because i did not know

Any idea?

Thanks

⟐ Answer accepted 四月 20, 2026 at 15:15 GMT-7