2008 24" iMac No Backlight Repair 

Perfect !! I have tried everything , watched soo many RU-vid videos but nothing worked. I bit the bullet and soldered on the wire. It works perfectly ! Thank you soo much for a fantastic video 😊👍

This is so well made. I don't have a mac but I still watched the whole thing, was so easy to watch!

Excellent, got my iMac 2008 24 running again. Important to use some flux before soldering the SMD led contact.

Excellent mate Thank you very much .. work perfect

Nice one. Worked like a charm. Thanks!

Hi gud day sir...is it possible for imac 20".i'd try but the bong sound was lost maybe in 20" 2009 is a different circuitry...do you have any idea of this...tnx a lot

Hi there, I have an A1225 , powers on I can hear chime but black screen . LED1 is on V = 1.8 LED2 is on V= 1.8 LED3 is off V=3.3 LED 4 is off V= 0 Terminal 3 on connector is 0V , I do not you schematic diagram to trace circuit . Any help appriciated

My imac 27 2011 screen goes complete black while imac is still working ( Screen sharing to macbook still working too) .. when I press power button for 1s and click on the mouse screen came back on (sometimes i need to repeat it few times) ,,, I've done PRam and nvram reset ,imac was cleaned Gpu ,Pcu termal paste change but did not helped ... Any advice ? ( Screen sharing to macbook still working during black screen on imac ) .. Any advice ?

Very well made Video, Thank you for such clear and good instructions. I have the same Machine, but my Backlight is only partially off, often flickering at start, sometimes going dark altogether. I already bought a new, tested Inverter and changed it, but that lead to no changes in behavior. On the "on/Off" trigger pin you point out in the Video, I get a voltage of roughly 1,5 V (fluctuating between 1.58 and 1.44 V) - I'm not sure if that is what is causing the issue, as the Voltage you took from the LED only is 1.8V, and your display works... May I ask where you got the Info what Voltage should be present on that pin? On my search for clues on the Web I came about different statements what that specific Voltage should be (1.5V, 3.3V, 5V..) . To know a definitive answer could help me find the root of my problem. Otherwise I simply would take 3.3V from the SATA-Power Connector and see what happens. :D Again thank you for your Video, on this otherwise rarely in-depth talked about issue with old imacs. :)

So my old max is turn in but it goes black, i click on the mouse and it remains in the black screen but i see the mouse. I quickly see a pop up but can't make out what it is because it goes blk. Any suggestions

Darnit i need a workspace to try this im literally trying to fix my computer on my bed 😂

How many volts trows the black cable you cut to the four light?

I have an iMac 2008 20" and the backlight isn't coming on. I do however have the 3v at the connector, do you have a video on the other type of issue?

Can I do this same repair on a different age imac? I found led4. My setup looks a little different then yours. I see Led 1, Led2, Led4, then it shows four circles 1, 2, 3, 4, at the fourth circle it shows led3. And the 3rd circle it had a rectangle near it that does not look like the two rectangles above and the one below it. It looks like it has a small hole in it. It looks silver, instead of yellow like the other 3 rectangles that are near 1,2,3,4 circles. I wish I could show you a screenshot, would make it easier to explain.

Hi Aron, my friend gave me an iMac 2011 21.5" and I am new to Mac. I tried to add a SSD, clean the fan and changing thermal paste for both GPU and CPU. After I assemble them back together. I got blackscreen. All 4 LEDs are on but just no image. There was once image flashing but I cannot repeat this. I was thinking my thermal compound is a bad one so I have a new one on order. Do you have any suggestion? Thanks a lot.

Any idea if the same issue occurs on the 2010 27" models? On mine, the screen lights up briefly before going black. The LCD is working when viewed under a bright light. Changing the driver board hasn't helped, though I can't guarantee that the "new" one worked any better to begin with.

Excellent video. My A1224 Imac has the same problem, but I can't find the exactly point below the fourth LED to solder the wire. I connected the wire bellow the third LED, the screen works, but the fans starts to very fast. I took a picture of the diagnostic LED area, if there is any way for you to see the photo, maybe you could help me. Thanks a lot.

Excellent video. Super easy to follow though the idea of replicating work makes me cringe. 2007 24” iMac: I don’t think I can see an image with the flash light. I hear the boot chime. I try login and hear the hard drive spin but no image. Any ideas? (I’m going to crack open iMac because I at least need to get hard drive out and copy data)

Great video! I hope you still reply to comments after two years... I came to this page by google search because my 2008 iMac 24" has black screen issue. When powered on, I do get the apple chime sound, and I see the fans are running but nothing on the screen. I tried shining a flashlight into the screen, still see nothing. Then I did the voltage test as shown in your video, it came out as zero. One thing I noticed is that in your video, all of 4 LEDs are on with green light. But I only got LED 1 and 2 on, not 3 and 4. I suspect that my graphics card is dead, but not sure. I cannot find the right cable (mini DVI ?) to connect it to an external monitor to verify. Any suggestion or tip? Thanks!

Sometimes i can get it to work with cmd+alt+p+r, but sometimes it doesn't work at all...

Hi, is it possible to use that imac model as a monitor for my macbook air? Thx 4 help

Could you not just run a jumper wire from the imac's PSU 3.3v power rail to the the inverter on/off signal wire?

what cable can i use to connect them together? does it have to be a Ribbon cable?

I can't quite figure out what's wrong with mine. The iMac [early 2008] restarts several times before being stable. Of late it shuts down more often than before [3 months problem]. 1. I noticed that the first 3 LED lights work just fine but they quickly go off [except #LED 1] whenever #LED4 comes on. This happens several times until it finally stabilizes and turns on [at this point, all the 4 LED lights are on and performing normally]. 2. I further examined the inverter area and discovered that one of the 4 connectors [from the inverter to the screen] was burnt [the plastic was melted]. I replaced it with a good one hoping that the problem will be solved but it persisted. How can I solve this? Thank you

Ok, I hope you still remember this issue. I have a similar problem on my sisters 8,1 20 inch iMac, it has only one light bulb (the bottom one) working at all times, and the upper part of the screen turns on for just a brief second, after waking a mac from sleep, and then the upper backlight of the screen turns off.

Very Good my bro

Will this work on a 2011?imac 27 inch ?

Great Video thx I had the same problem and did what Bezzina did, only the third led was soldered with fast glue ahahaha and it worked perfectly

What if there is no image or backlots but the computer is functioning as supposed to... ?

what about if the backlight isnt as bright as it is suposed to be? is that fixed by replacing the inverter board? or the entire screen?

My LED 4 is not on at all tho

Would you be able to fix my monitor? I will pay you for your head work of course!

IM FROM INDONESIA, THANK YOU BROOO