Chosen Solution

I can barely see the screen and adjusting it makes no difference

shawn sounds like your backlight has failed. Most common cause for that are bad capacitors. Your monitor does not have a separate inverter but it is part of the power board. Start by disassembling the monitor and take a look at the boards and the caps. Check for bulging or leaking caps. Post some good images of your boards with your original question. For that use this guide. Since I only have the assembly instructions, substitute the assemble with disassemble