My problem might be caused by the display, which can be blame on the supplier of the display.
As for how it passed the QC, actually it's not noticeable under normal conditions. When I show it to the customer service, she don't see the problem as well, then show to technician, the technician also took some time to check through and blame the picture quality. Even I show them the picture I took, difference between the demo set and mine, also they can't verify, luckily another customer send in an N8 later (I think for software flashing or something), finally we're able to make the comparison and accept for further check/repair.
You may say how the QC pass this; but remember, QC are done by human, regardless of race or where the QC is done; It can by pass naked eye easily as it's not really noticeable unless you check in detail. Beside, they might not know of this problem with the display. Now, since it's known, Nokia can highlight this to the QC department to add this into their QC checking list.
Since this is a parts problem, it doesn't really matter where this unit is assembled or QC, unless the QC person managed to see it that is. Who knows, maybe some customers also have this issue but they don't know about it and thought it was normal. Under normal conditions, it's really not noticeable.
Now, the problem I want to highlight is not the failure, but to provide a GOOD SERVICE & SUPPORT.
I've put in suggestion to Nokia during the Ranger even "No matter how good a product is, it's useless if the services and support is bad".
Since this N8 is new, all the centres don't have the parts or even know much of the N8, they don't even have an N8 in their centre to do comparison; IMHO, they should have everything ready BEFORE they launch the N8, also the parts. Imagine someone who buy the device and face problem, have to go through the hassle of warranty claims (which should be fast and easy procedure), and then have to wait for parts....
This thing applies to ANY products; For MY, another very apparent one is the auto-industry, which has very poor after-sales services and support.
i think the display might have been a fault in the amoled control...as we know, AMOLED handles pure black by turning the pixel off, where if you have grey, it will have to turn on, and show an extremely dark color...something something...so when u put image like what we used to test earlier on, black turn off + grey pixel is on, suddenly color difference will make it look like it's 16-bit color...it's one of the possibility that me and my other friend come out with