Solved!
After almost 3 years, due to the fact I was unable to stop and take my Imac for Repair since I work with it to make my incomes.
Basically the issue happens because the L9000 Circuit burns if you misconnect the LCD Display cable. I followed all the hints to check the LED Start sequence as you can see on this LCD Backlight not working = solved to this problem. I noticed that LED4 was not blinking on the startup sequence.
I connect an external display using Displayport and the Mac was running fine on it.
The next step was to buy the circuit from Digi-key, as mentioned by Yako on this post. You can buy the 220 OHM Ferrite Circuit here.
Next, I take my iMac to an electronics specialist who confirmed that the Circuit was burned.
He welded it again and TADA, LCD working again!
SOME TIPS:
a) The L9000 Circuit is below the GPU. So you will need to remove the logic board and the GPU (the whole thing with the cooler, etc.) Check the picture below to see where the Circuit is located
b) I Paid something like $10 for 5 220 OMH Ferrite Circuit on Digi-key. Link above.
Here are some pictures after the burned Circuit was removed and the new circuit Welded.
c) I paid $200 for the welding service and repair.
Thanks, everyone for the tips. Thanks a lot, Yako and everyone here for the tips and help.
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6 Kommentare
What are the last three digits of your serial number? This will help to properly identify your computer and your logic board. Also post some images of your connector so we can see what you see.
von oldturkey03
If you could post a high res pict of the damaged connector that would help.
von lemerise
My serial number is DGKGC0H9DHJW EMC 2429
How do I post images here?
von Adam Smith
Thank you Yako, that part is exactly what I am looking for, unfortunately an engineer has identified another part that is damaged. It is immediately below pins 4 and 5 of this part (looking at it from left to right) and is labelled L9000 on the logic board. Any ideas of what this part is and where I can get it from?
von Adam Smith
Thank you oldturkey03, I can see from your diagram that it is a 250 ohm ferrite inductor, but is unclear what the ratings are for that component, i.e. the voltage, current rating, etc... Do you have any of this information?
von Adam Smith
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