How does a screen/display repair work for dead pixels, yellowing, grey bar, backlight

[cryer]

I've got two iMacs in my posession currently from getting replacement machines. Both have screen issues as follows:

iMac A - dead & stuck pixels, feint grey horizontal bar running along bottom portion of screen, bottom left corner has noticeable backlight bleed

iMac B - dead & stuck pixels, yellow tinge in bottom portion of screen

So here are my questions. Which iMac should I keep and submit for repair? (does it matter and why or why not?)

How does the actual repair get done? For example, if I submit iMac B for repair, could I end up with a grey bar or backlight prob like in iMac A?

Are there multiple layers to the display when they fix specific issues? For example, let's say the dead pixels are on one layer while the yellow tinge is on a different layer, or are both issues on the same layer? I ask because if there are two or more separate layers, there is more of a chance to mess up so I may want to submit the iMac that has the least amount of issues.

Lastly and most importantly, has anyone submitted their iMac for screen repair for these issues and got it back 100% repaired? (no dead/stuck pixels, yellowing, grey bar, backlght bleed)

These are #4 and #5 in terms of the number of replacements I've gotten now and I'm sick of it so I may opt to go for repair on either of these existing machines instead of going for replacement #6. But do you think a 6th replacement would be better than going for repair on either of these? Or not?

Thanks in advance for your help in answering these questions. I'm really dismayed at the whole situation so if anyone has knowledge or experience on this and can answer them, it would put my mind greatly at ease.

 

[Vylen]

Don't they just usually replace the monitor straight out - no matter what the issue?

Cause it'd be easier to get something right off the production line rather than take something apart, get the individual components, and put it back together again - especially when it comes to LCD's...

 

[ejosepha]

I'm interested in same issue.

What build week number are your two current Imacs? I have grey bar, slight yellow tinge, and buzzing noise on lower brightness. But the grey bar is slight and below the dock horizon, and the yellowishness is at least spread out and not like other photos I've seen of bell-like curves of yellow.
I've been offered a screen replacement but not quite sure yet that all the problems have been solved.
Additionally, there are no dead pixels on this screen. Would rather have slightly warmer bottom of screen than dead pixels.
I see on other threads that people even with week 24 build are receiving Imacs with yellow tinge. Of course, the traffic has slowed down to a trickle so maybe majority of problems have been solved.