So I found the way to enter LG monitor service menu. Just turn off the monitor, wait for 5 seconds. Then press and hold the menu button. With it pressed, press the power button. The monitor will be on. Release menu button. Then press menu again and you will get the secret menu. So this way, I found a field called "Panel" and in my LG E2042TC, it is written CMI 200 L23. I immediately searched Google and came to know that the panel is manufactured by Cheimei Innolux corporation- Taiwan's largest LCD manufacturer and the world's second largest(as per wiki). So how is this CMI brand? Any ideas?