Display problem after apple repair

Hello everyone,
Few weeks ago had this problem with vertical lines on my iMac display, which apple told me it was a display problem and they needed to changed it. So far so good... despite the 300pounds i had to pay for a new screen but anyway....... now look what happened...
i was wondering if anyone has seen this problem before (i wish i could browse on internet about this problem, the thing is: with my screen like this i cant distinguish what is or isn't a good image when i watch videos/pic posted from other users regarding displays problems)... do you think is any graphic problem? or display again?
i'm so upset
Thanks

Thanks for your reply.
I've just done it and the screenshot looks fine on my iphone. So... LCD problem again...? great
can you see any problem on this screenshot?
Thank you for you help.

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