I got a 24" cinema display that had the same issues. Since it was thrown out of the office, I decided to have a look at what the the problem was (as I see a lot of these screens on my local auction site with the exact ssame issues). TL;DR : - The only options you have are : 1. replacing the entire LCD panel with a working one. 2. replace the LEDs on the LED strip inside the LCD panel. - Replacing the LED is extremely hard because of the thick aluminium strip to which the LED strip flex cable is attached to, absorbs all the heat. My rework station did not produce enough heat so you need something like a heating plate. - Cheap CCFL-to-LED backlight conversion kits don't produce enough light (15W instead of the needed 61W). - I have not been able to find a seller of replacement LED strips. - I tried using other LEDs but the LED driver seems to be configured for the LG LCD panel LED strip. My screen sometimes flickered for a second and then would turn off, even at the lowest brightness setting. USB and sound...