Faint pixel thick vertical lines on Apple Cinema Display 27"

Hello, I also have such a problem and want to try to fix it. After correcting it, I plan to describe the result. I found your message and would like to check it, but there is a problem, which is that this chip is an EEPROM (Electrically Erasable Programmable Read-Only Memory), which means that the firmware needs to be written to the new chip. Could you please describe in detail how you solved this problem, or perhaps you already have another solution?

@imortl - Sorry, this is not the issue. As you noted this is an EEPROM chip. The issue you are facing if its the same lines repeating is a timing issue where noise is sneaking into the LVDS signal lines. This kind of issue is always old electrolytic capacitors which have broken down.

@danj thank you very much for the explanation, any help for me is the last hope for repair. please tell me, do you know which group of capacitors on the circuit should be replaced? can I leave you my e-mail and I will send you a picture of the circuit? imortldrumandbass@gmail.com

@imortl - Sorry I can’t pullout the ace of spades from the pack of cards without looking😏 But, you should be able to! Of course looking in your case.

The trick is first physically looking at the caps both Electrolytic and Tantalum Capacitors looking for damage. Then measuring the power rails and grounds referencing the schematics and board views.

Once you’ve identified the cap you’ll need to replace it, do you have the needed tools and have the skills? If not you’ll need to seek out someone locally, hopefully with iMac repair skills.