Hi guys! I been a cellphone tchnician for 9 years now with a company that gives services to 30+ stores. Personally I have worked about 5 LG G2 that have presented this situation. I have observed that when SCREEN WORKS in other LG G2 but DOES NOT SHOW IMAGE on a certain LG G2, they have had some capacitors in front of the right Main Flex BOARD Connector in the Main Board. They are two black capacitors that are very fragile and can be easily damaged in any replacement process and will not be able to pass information from the Main Board to the LCD. This will give you NO IMAGE and can only be repaired by replacing those capacitors. Will require soldering skills. I have not found those capacitors to buy then yet. Still, I have taken them from water damaged LG G2 Boards. Hope this illuminate your work!