Answer to "Relaced screen assembly, now have a "grid" on the screen."This is often the case when either the display connections are not properly seated, the display itself is damaged somehow (Doesn't necessitate a break to the LCD or Glass), or unfortunately the possibility of a bad Logic Board. I'd recommend double checking the Display connections to the board (You can test this by pressing with Some but not Hulk-Like force on the right top of the display) and see if that makes a difference. An odd point to note, but did any of the stand offs for the display cowling screws seem loose, or did they come off when removing the cowling? I've seen this occur and cause a grounding issue before. My guess is Bum display, Or possibly a bad Logic Board. To clarify the issue causing you to replace the display, the phone would turn on, but you would get no Image? Or would it turn on with an image, but simply go black displaying nothing?
Answer to "How do I replace the hinge/clutch cover?"Hello! It is technically possible to remove the clutch cover on the Retina MacBook Pros but it is a difficult repair, as the clutch end caps are adhered to the display a bit and have small plastic clips that often bend or break. On top of that, sourcing a replacement clutch cover would likely require eBay or some other method as I don't see the part listed as a replacement part on iFixit. To the point, you'd first need to remove the display; MacBook Pro 15" Retina Display Late 2013のディスプレイアセンブリの交換 After that, you'd need a Spudger using the point end to lightly remove the two plastic end caps on either side of the clutch.. This is the hard part as they often break or bend and if they do, they will not sit correctly most times when you attempt to put them back on. (It should be noted though that the clearance on the top case and these pieces is tight, and some people don't mind the clearance actually helping hold the piece on) Then holding the display with the apple logo towards you and the display pointing away...
Answer to "Why won't my laptop charge?"This can be a tricky one to fix, as it sounds like at some point some liquid did make its way to the inside of the unit. Ruling out the Magsafe board I would recommend taking a peek around the top area of the Logic Board near where the connection for the Magsafe board is, on both sides to be sure, then over the surface of both sides of the board for some corrosion. Likely somewhere there would be a bit of corrosion at some point possibly causing a problem. This is often some shade of green, or even a white color and is usually found near components on the Logic board itself. I've had some luck with cleaning this in cases with an ESD safe brush and a bit of rubbing alcohol for some units, but it's a risky fix as you could possibly further damage the board, or even accidentally knock something off the board such as a small component making matters worse.