Does it need to be jumpered? On the other A4000 i don't have any jumpers installed, and don't have any issues with screenmodes, but on the other one it seems to have issues with internal scandoubler, vertical lines and greenish picture. My monitor is 22" LCD which is working fine with the other A4000. With Retina, picture is normal. With external scandoubler there is no vertical lines, but greenish seems happening from time to time, not always. Possible leaking SMD near the battery area ? Battery has been removed. The other one has default jumper setting, assuming it's 1-2.
