I have everything you need (or so I think) to use my imac lcd panel (panel LM240WU2 ( SL) ( B4 ) ) as a monitor for other pc

http://i62.tinypic.com/112e876.jpg

http://i61.tinypic.com/2mwxct2.jpg

also I connect the cable from the inverter to the lcd

this http://i59.tinypic.com/f10dts.jpg to http://i57.tinypic.com/f2itxd.jpg

Connect the power cord from the iMac ( white ) energy to the panel. and I connect the power adapter to the board vga 12V 2A

but does not work , connect via a PC to give vga video signal and does not work

do I wrong ?

Help please :(

⟐ Answered April 02, 2026 at 23:00 MST

I have an early 2009 24" iMac. It works well but it's starting to get old.

My question is if there is a chance to use it as an external monitor attaching a LCD controller to the screen.

My goal is to make a switch to use the iternal hard (core2duo) or use the imac as external monitor with a DVI plug on the back.

Thanks.

⟐ Commented January 31, 2026 at 14:59 MST

⟐ Answered January 01, 2026 at 17:40 MST

Why does the display remain dark?

⟐ Answered December 30, 2025 at 9:59 MST

⟐ Commented December 01, 2025 at 17:35 MST

I have an old 24" "broken down" imac, and i would use is it as an external display for my new 21,5" i5 imac. Is it possible with or without modding the imac to use it as an external display?

i know that it isnt possible to use the origional displayport.

any help is welcome

⟐ Answer accepted September 23, 2025 at 5:16 MST

I'm looking for a board view file download for 820-2301. Any luck here?

⟐ Edited June 24, 2025 at 3:44 MST

Has anybody tried a CPU upgrade to Intel Core 2 Extreme X9000 S-Spec SLAZ3 on a iMac Intel 24" (mid-2007) mounting CPU X7900 and running OS X El Captain?

Thanks,

Marco

⟐ Commented June 19, 2025 at 5:22 MST

I've been looking around to see if I can swap out my current graphics card for a better one. Having seen many conflicting and sometimes confusing answers I thought I'd ask on here in the hope someone has tried and tested!

I have an early 2009 24 inch iMac Intel Core 2 Duo 3.06ghz with 8gb RAM and the GPU is an ATI Radeon Mobility HD 4850

I saw a guide on here that showed someone successfully changing theirs, but what I wanted to know was if it was possible to upgrade to a different card with more memory, 1GB or higher.

Things that worry me are, would another card fit ok? would there be overheating issues? and is there Apple firmware that needs to be pre installed for it to work?

Many thanks in advance

⟐ Commented March 19, 2025 at 4:13 MST

Now my USB ports just stopped working, and now I can't do anything after I turn it on. I can't type anything. I can't click on anything to get into it. I did read somewhere online that the newer Mac computers don't have USB ports in favor of Bluetooth and wireless connections, so that could have something to do with it, but I need those to revert back to the older macOS version just so I can get all my programs and pictures off of it and figure out how to go from there as far as updating it goes.

Any information you can provide would be great. I'm not super tech-savvy when it comes to Apple products, so please baby steps with me.

⟐ Commented February 20, 2025 at 7:11 MST

⟐ Commented January 26, 2025 at 12:35 MST

I would like some insights about iMac's power supplies, especially the Early 2009 24" (A1225 EMC 2267).

I decided to tinker with an old broken iMac (machine that shuts itself down) to make it a Media Center with my Rasberry Pi and its Hifiberry + an LCD controller. But to do it right, I need to use the power supply for the screen (+ fan and why not also power the raspi).

But for that, I need two things:

The voltages (and current) of the output connectors which are obviously not standard (12 pins for the 12v-3.3v and 12 pins for the 24v that runs towards the inverter of the screen, although for the latter, I don't really care).

Know which pins to connect to activate the power supply (if I had this element, I could measure the voltages myself).

For now, I've spotted three things:

* Pin 1 = Ground

* Pin 2 = 12v always on

* Pin 4 = 3.3v always on

* Pin 6 = Ground

For the rest, I'm drying up, if you'd give me a hand, I'd be extremely grateful.

Hello,

I've made some progress in my tests, I've managed to activate the power supply!

It is sufficient to make a bridge between the ground (PIN 1,6,7,12) and the 3.3V (PIN 4), which activates pins 8, 9, 10

So we end up with these values:

On the 12V output (2x6 pins)

• Pin 1 = GND
• Pin 2 = 12VDC -> Always On
• Pin 3 = GND -> if SATA connected
• Pin 4 = 3.3VDC -> Always On -> PS_ON
• Pin 5 =?
• Pin 6 = GND
• Pin 7 = GND
• Pin 8 = 12VDC -> If On
• Pin 9 = 12VDC -> If On
• Pin 10 = 12VDC -> If On
• Pin 11 =?
• Pin 12 = GND

On the 24v output (1x12 pins)

• Pin 1 = 24VDC -> Always On
• Pin 2 = 24VDC -> Always On
• Pin 3 = 24VDC -> Always On
• Pin 4 = 24VDC -> Always On
• Pin 5 = 24VDC -> Always On
• Pin 6 = GND
• Pin 7 = GND
• Pin 8 = GND
• Pin 9 = GND
• Pin 10 = GND
• Pin 11 =?
• Pin 12 =?

A last connector is present on the power supply, it is a ground that seems to be dedicated to the 5V (it is connected to one of the SATA GNDs and to the motherboard).

We can see that this power supply only provides 12V and 24V, as surprising as it may seem, it is the motherboard that is in charge of transforming the 12V into 5V! (the cable between the power supply, the motherboard and the hard disk confirms it).

So I still have Pin 5 and 11 on the 12V port and Pin 11 and 12 on the 24V port which are a mystery (if someone has an idea, I'm a buyer)...

I found the electrical schematic of a Liteon PE324101UN-LF power supply (which also seems to be used in other iMacs), there seems to be some info, but I can only guess the usefulness of these pins....

On the 12V output (2x6 pins)

• Pin 1 >>- +12V
• Pin 2 >>- +12V
• Pin 3 >>- +12V
• Pin 4 >>- GND
• Pin 5 >>- GND
• Pin 6 >>- GND
• Pin 7 >>- +5VS
• Pin 8 >>- +5VS
• Pin 9 >>- +5VS
• Pin 10 <<<- AC_DET (Alternating Current Detection?)
• Pin 11 <<<- P_DIM (Power DIMming?)
• Pin 12 <<<- BL (LCD BackLight?)
• Pin 12 <<<- PS_ON (PowerSupply ON !)

On both 24v outputs (1x12 pins)

• Pin 1 >>- 24V
• Pin 2 >>- 24V
• Pin 3 >>- 24V
• Pin 4 >>- 24V
• Pin 5 >>- 24V
• Pin 6 >>- GND
• Pin 7 >>- GND
• Pin 8 >>- GND
• Pin 9 >>- GND
• Pin 10 >>- GND
• Pin 11 <<<- P_DIM (Power DIMMING?)
• Pin 12 <<<- BL_ON (BackLight ON?)

For AC_DET, I found this definition:

AC adapter voltage detection input. Valid AC adapter input range is set using resistors forming a voltage divider which are connected between ACDET & GND and ACDET & AC adapter.

P_DIM should reduce the output power of the 24V PINs to reduce the brightness of the display?

BL_ON, turn on the LCD?

In short, full of new questions.

Well, I finally succeeded in measuring everything I wanted.

I made a little schematic for those who would be interested.

If there's a mistake, don't hesitate to tell me.

oldturkey03> BL_ON needs to be powered in 5v to turn on the screen. For P_Dim, it's more complicated, I think it's about frequency, but the LCD converter will do it.

mayer>My power supply works very well, it is here a question of knowing what its specifications are to power a Raspberry Pi and other accessories without Apple motherboard! ;)

⟐ Answered December 15, 2024 at 10:17 MST

anybody help ?

thank you

⟐ Commented December 15, 2024 at 9:42 MST

⟐ Commented November 19, 2024 at 12:08 MST

Hoping to upgrade my mid-2007 24” iMac to a ‘Penryn’ CPU, I very carefully read/absorbed lots of detail descriptions/accounts of how/why/what not to do, followed them meticulously and fitted a (allegedly) new T9500 CPU.

All back together, I plugged in and tried the start button.

Nothing - apart from the usual two quick buzzes from the optical drive. Took the ‘glass’ and the alloy frame back off, tried again and the same result plus noted very small flick of the CPU fan. Numbers 1, 2 and 3 of the LEDs to the right of the memory slots come on but nothing else happens, no chimes, no screen illumination, nada! - and I waited 15 minutes in hope.

Put the old CPU back in and away it goes, as reliable as ever.

Fearing I’d missed something I’ve done the same exercise three times now, all with the exact same result. I now KNOW I’ve not messed up because as soon as I put the old CPU back in, Bingo! away it goes, perfect boot, everything. I’m writing this on it.

There are lots of articles about how to do it, none mention any problems booting afterwards. There are only two posts that say the T9500/T9300 might be incompatible amongst the very many that say they are perfectly OK, other than speed reporting errors. The two I’ve found saying the CPUs are incompatible are effectively disputed in the following posts.

To be candid I really don’t care if the speeds are reporting incorrectly, all I need is SSE 4.2, which the T9500/9300 have and that will allow me to install Catalina with a patch.

Bottom line: Have I probably got, as I suspect, a faulty CPU, or is there somewhere some definitive information that says the T9500/T9300 are NOT compatible - and that incompatibility something is more than just the misreporting of speeds.

Will

OK, I understand the concept of the EFI not being able to use the T9500/T9300. That said, I have never (happily) had to dig into my iMac’s bowels to see if the conflict might be there.

At the moment I’m on the latest (last ever?) update of El Capitan and I’d understood that any EFI upgrades came embedded within the OS updates as they were incorporated - or is that a misunderstanding as well?

A couple of examples of what spurred me to try and give my iMac a new lease of life can be found in the following links:

https://www.youtube.com/watch?v=JmLkRk3Z...

(even if his technique is a bit off)

and a whole series of articles like this from a well respected blogger, with very specific details regarding what will and what will not work:

https://lowendmac.com/2018/penryn-t9300-...

I’m running a Mid 2007 24” iMac 7.1 that I’ve had from new - apart from the screen size, just like the example used in the youtube I referenced. Is it possible there is some subtle difference I don’t know of that is foiling my attempt and could you point me in the direction of finding it please. It does seem a little hard to take that all of the youtubers/bloggers are full of it and peddling the theory for some reason best know only to themselves - unless, perhaps, to capitalise on the disposal of an excess of unsaleable T9300/500 CPUs?

Will

It’s fixed!

It was a dud T9500. The replacement worked and booted straight up as soon as fitted.

No one was ‘at it’, it’s not a myth, it works and was a bit of an undertaking but with care and attention, quite possible. The only thing not reported correctly is the CPU details and the FSB speed. Who cares? It is working and markedly quicker. Most importantly it allows upgrades to a later OS.

To upgrade to Catalina, Dosdude1’s tutorial is excellent and all his patches and updates work well. Just make sure you follow it to the letter. I would put an image of ‘About this Mac up but can’t see how.

A 13 year old iMac, running Catalina, for the outlay of £125 and a few hours of work and effort.

Will

⟐ Answered October 03, 2024 at 11:48 MST

Update iMac was left sitting around till I sourced a CPU to try came to install first I tried powering it up before replacing but now only got diagnostic lights was working yesterday and nothing was done

Update got new ram and received error lights again but nothing else swapped CPU but no change till the morning when it booted up a few times but then it got stuck at a white screen and then multi coloured lines as well GPU ? Thanks in advance

⟐ Commented June 09, 2024 at 1:02 MST

⟐ Answered June 02, 2024 at 14:42 MST

A friend of mine gave me a broken imac 24". I would like to recycle the power supply for another project, however i don't know the pinout, well i could easily find the Vcc with voltmeter. I just need to know which pin will switch on the unit, and if it's a "connect to Vcc" or "connect to ground" system.

Here some more

ref. SADP-220AF (A1200)

24v@4A and 12V@10,3A

A few pics

Cheers!

⟐ Commented May 28, 2024 at 14:41 MST

⟐ Commented May 11, 2024 at 21:54 MST

⟐ Commented April 15, 2024 at 8:37 MST