iMac 24, 2007, black display, though it projects to second screen

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iMac Intel 24" EMC 2134 and 2211

Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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Thodoris @thodoris

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发帖于: 2018年11月22日

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iMac 24, 2007, black display, though it projects to second screen

Hi,

I bought a used imac 24”, late 2007, EMC 2134 (imac#2). It worked for a few days and then I get a black screen.

When I am starting the imac, I hear the starting sound and fan but I always get a black screen. All 4 indicator LED lights are lighten. I tried and reset PRAM, change battery, remove all external devices and keyboard and unplug it for a while but nothing work. I also used a flashlight and lighten my screen trying to see my desktop but I didn’t (in case that was a back light issue as some people on the web stated). Then I connect it to an external screen I can see my desktop on the external screen.

I have done some research on the web and I see that there are a few more things to try:

a) replace the inverter board

b) connect with a wire two specific parts, inside the imac, in order to give to the display the message to turn on

Do you think that any of these suggestions would might fix it? I would appreciate if you have any other suggestions of what I have to try in order to make it work.

I want also to mention that I have also one more imac 24”, late 2007, EMC 2134, that I had bought as new back in 2007 (imac#1). I also had a black screen on this. A technician told me that I had to replace the screen, another one told me is the graphic card. Only the three first LED indicator lights are lighten. Then is when I bought the imac#2. So I can take parts from the imac#1 and place them on imac#2, if it is a need.

I also tried both displays in both imacs but I still getting a black screen in any combination (with imac#2 with all 4 LED indicator lights lighten and imac#1 with 3 first LED indicator lights lighten).

I am not experienced with electronics’ repairs but I will give it a try.

Please let me know if you have any suggestions.

Thank you,

Thodoris

Regarding the inverter, I tried to replace it but I didn’t manage to take it out completely as it has a blue “cord” connected to the inverter board and it looks like that I can not “unplug it” somehow.

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mayer @mayer

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You’ve covered the possible causes. In your case I would switch the inverters. This is the guide for the 20” but will work for you:

iMac Intel 20" EMC 2133 and 2210 Inverter Replacement

Inverter cable Apple part# 922-8236

LDVS Cable Apple part # 922-8162

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If necessary, here's a link to a replacement inverter

https://www.fasttech.ca/imac-20/imac-int...

由 [deleted] 完成的 2018年11月22日

Thank you, I will try it. Could you be able to say if it might be damaged the inverter of my imac#1 too?

由 Thodoris 完成的 2018年11月22日

Place a flashlight onto the screen at a sharp angle do you see the faint image of your desktop and its icons.

由 Dan 完成的 2018年11月22日

I have tried with flashlight and I don't see anything.

由 Thodoris 完成的 2018年11月22日

I don't see any inverter cables as in step 10. I get on step 17 and I removed the optical drive but there is nothing under it (no inverter on this place). I guess because mine is 24" and the instructions are for 20" might be different. Do you have any ideas where it might be? I tried to add an attachment but I couldn't do it here, so here is a link for the photo of what I see: https://ibb.co/gnRVEq

I think that the inverter board is attached right behind my screen so I will give a try to this one the soonest iMac Intel 24" EMC 2111 Inverter Board Replacement

由 Thodoris 完成的 2018年11月22日

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If necessary, here's a link to a replacement inverter

https://www.fasttech.ca/imac-20/imac-int... — [deleted]
Thank you, I will try it. Could you be able to say if it might be damaged the inverter of my imac#1 too? — Thodoris
Place a flashlight onto the screen at a sharp angle do you see the faint image of your desktop and its icons. — Dan
I don't see any inverter cables as in step 10. I get on step 17 and I removed the optical drive but there is nothing under it (no inverter on this place). I guess because mine is 24" and the instructions are for 20" might be different. Do you have any ideas where it might be? I tried to add an attachment but I couldn't do it here, so here is a link for the photo of what I see: https://ibb.co/gnRVEq

I think that the inverter board is attached right behind my screen so I will give a try to this one the soonest iMac Intel 24" EMC 2111 Inverter Board Replacement — Thodoris

Dan @danj 声誉积分: 478.9千 Self employed contract worker 35 329 970 · Answer 1 · 2018-11-23T06:31:06-07:00

Dan @danj

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Lets look at this from a different direction as I don't think you have an inverter issue. If you did you would have seen the faint image of your desktop and its icons. As you can see an image on an external display that narrows things to a bad LVDS cable and/or the connector on the logic board. I often find the connector has been pulled slightly from the logic board which can make the connection sporadic.

Also, I find the cable had been inserted backwards which tends to blow a few components.

Lets take a few pictures here of the connector and the area around it. Sharpness it important here! So make sure you’ve got enough lighting and hold the camera still. Take one looking into the connector down directly at it from the front and then 45 degrees from each sides and lastly one looking at the solder joints at the bottom looking up at 45 degrees. post them here for us to see 在已经存在的问题里加入图片

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Thank you for your reply @Dan and for explaining me how to upload the photos here. I uploaded some photos and I hope these are the parts you mentioned (if you want me to upload some more photos please let me know).

I also replace the cable that connects the display to the imac (I guess this is the LVDS cable? https://d3nevzfk7ii3be.cloudfront.net/ig...) but nothing change (both cables I tried them on both of imac#1 and imac#2)

由 Thodoris 完成的 2018年11月23日

Sadly you’ll need to focus on the logic board display connector as its likely damage.

由 Dan 完成的 2018年12月6日

Could you please let me know if you did see from the photos any particular part of it to look like damaged, or you conclude it from the rest information? Additionally, as I have a logic board from my other imac, do you think it worth trying to switch (from one imac to the other) the entire logic board or just the display connector?

由 Thodoris 完成的 2018年12月7日

If the other iMac is the same series and is not working then it does make sense to use it for parts. But if it works or a different series then no you don't want to steal the part. The part is a standard connector Mouser sells. The only rub is you'll need to buy the minimum.

由 Dan 完成的 2018年12月8日

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iMac Intel 24" EMC 2134 and 2211

iMac 24, 2007, black display, though it projects to second screen

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