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In LG w1943sb monitor, screw is not used. .In this type 'press-lock' of cover is used. Did you have opened IR remote control, most remote control also used as this monitor's lock, and you can open with a flat screw driver.
Plug a spare monitor in the computer to see if works, if it does! the LG monitor has issues and not cost effective to have it repaired. A final thought! make sure the power and video cord are snug tight on both ends of the LG monitor. If the same problem persists in both monitors, the computer has a Video Graphics Card issue.
You need to use flat thin blade screw driver to crack open the case, starting at the bottom edge of the case first, you may need two screw drivers, when it starting to come apart, leave one screw driver in the partially opening section so it not snap back together while you tackle another section of the case. Most monitors cases these day do not have small slot to show where you should crack open the case at, they just do not want you to fix it.
Remove all the screws from the screen that you can, check for screws under all soft objects and labels, after all screws are removed, use a flat screwdriver or a case opener tool to start snapping the display cover open, it is hold in place with plastic clips, these will clip open but be carefull not to break any.
Because the fuse on scaler PCB is blown. Open the monitor, open metal cover, disconnect all cables coming between display and boards, take the chassis off the display. On back side of display you will see metal cover, mounted with tiny screws, take them off. Unscrew the board also and carefully tilt it up. Observe tiny chip fuse (referenced F1 or FU1 or something with "F") somewhere nearby the connector, ring it, replace it with solder drop. Take everything back together.
I used to
repair LCD monitor from Dell. There are 4 screws for rear panel and no screw for
front frame. If there is no visible screw, you have to look for
"capped" screw holes (little covers that fit flush with the case to
hide the screws). If you don't see these neither, this must be a tension fit case.
So, face the screen up and look for "rectangular hole" on the side
edge (usually at the bottom edge of the screen). This will be a challenge to
open without breaking it. You'll need a very thin flat screw driver and wedge
it into that narrow rectangular hole. You can use any prybar if you don't have
screw driver. It is not too deep. You may stab something important inside and
pry it. Once it starts to spread, start sliding it along the seem and you
should feel the tension tabs start "popping" open. Continue to work
your way around until it's off. Hope this will help you to get the rear panel
off. If there is anything I can help you with, feel free to let me know.