This could be a couple things. First try the flashlight trick. take a flashlight and shine it on the display while the tv is on. if you can see any faint images, then you have a bad backlight driver. If there is no picture, then you either have a bad TCON or Mainboard. More than likely it is the Mainboard. This would be the one that is connected inbetween the powersupply board and tcon. it will more than likely have all of the video inputs and outputs on it.
Display can easily be replaced, but it is very expensive. Sostituzione schermo Motorola Moto Z2 Force Here is a link to the guide on ifixit.com https://www.mobiledefenders.com/lcd-digitizer-assembly-for-motorola-moto-z2-force-xt1789-authorized-oem-black.html Here is a link the part needed. The part runs well over $100 through most vendors though. I wouldn’t recommend doing a glass only repair on this one.
It looks to me like the LCD has been damaged upon removal. This is likely to have happened when the LCD was pried away from the adhesive that holds it down. Unfortunately, this is only fixable by opening the device back up and replacing the LCD.
You need to install a program called Android File Transfer. https://www.android.com/filetransfer/ Mac OS does not allow you to gain access to the internal memory of your phone through normal means without this program.
Sounds like the picture window is dirty. Take the LCD off and the prox out of its ring (if the ring is intact) and clean the window with a Q-tip soaked in rubbing alcohol. If this does not fix it then the screen will need replaced. This just happens with aftermarket parts sometimes. The glass just isn't high enough quality and ends up being slightly opaque.
It looks like you either have a bad LCD panel (the video display itself) or a bad TCON board. I am going to say its a TCON from past experience. These are generally positioned in the center of the back side of the set under the case. Check all connections on the TCON board just in case they are loose. If this does not fix it, I would recommend trying a new TCON board.
If you are talking about dots that look like either of these links then you have a bad LCD and will need to replace it. Can you upload a picture of what it looks like as well as the model of the laptop? https://i.ytimg.com/vi/Gze89ERGvYo/hqdef... http://i.imgur.com/ed4EOXP.jpg
I hate to be the bearer of bad news but it sounds like you have a damaged LCD. You will need to replace it to remedy this issue. iFixit does not have a guide for this uploaded. This repair can be somewhat complex for someone who has not done it before. If you attempt it at home, take your time and use plenty of heat.