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Hello,
i have a new problem with my tinker imac. I get a “new” Logic Board, now the imac start’s and the most of the imac is fine.
On screen i have small doted lines. See picture.
I have connected a monitor to the imac, on the external Monitor there a no lines.
I think is not the graphic card, maybe it is the LCD from imac. If there any test to check if the panel broken?
Thanks and best regards
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You have the right idea the internal display is the source of the lines. But the LCD panel within the dislapy assembly is not the source! On the backside of the assembly is a circuit board we call a T-CON either it has a problem or the cable leading from it to the main logic board (LVDS cable) has an issue.
This is most likely a noise issue where one of the noise compression caps has started to fail on the T-CON. I often see these lines slowly crawl across the screen (V-sync issue).
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Thanks, it is possible to send me a link where can i buy a new T-CON Board one.
I have switched the LVDS cable with no success.
It is part of the assembly and not typically sold on its own. This is a case were we take two displays and make one out of the pieces!
You might find the needed T-CON board at a parts recycler where they get a smashed panel and salvage the T-CON. Or you find a systems which has a damaged display and do your own recovery.
The Apple P/N for the full assembly is 661-5527
See if you can find the T-CON by searching for LM270WQ1(SD)(A2) display do be careful! You want to make sure you get the full number which includes the SD & A2 parts
I found one at ebay:
https://www.ebay.de/itm/Original-6870C-0...
The Black adhesive foil on the backside of the Display what is the right name for it?
Thank's a lot!
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