Dear all,
A picture says more than a 1000 words, so I edited some graphics to explain the situation
Suppose this is the image on the screen how it's supposed to be
I think this is a problem with the backlight, because I see also some other signs that refer to this. I'm quite positive it has nothing to do with the GPU.
Is there a way to fix this?
Regards, Michael
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I haven't seen a shadow masking issue like you have here (all the way around). Most of the time it's a lamp issue or the inverter has gone. I'm wondering if the foil tape adhesive has broken down or someone sprayed a contact cleaner which has oil which has managed to migrate onto the defuser sheets.
I think the best solution here is to replace the display unit. Here is the part you'll need: iMac Intel 20" (EMC No. 2210 or 2133) LCD Assembly - Apple P/N 661-4434. Here's the IFIXIT guide you'll need to follow: iMac Intel 20" EMC 2133 and 2210 Display Panel Replacement
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