You poor people, having to deal with repair-tech 
My W240D-PVA developed the same fault.
First try, it took them 2 months to replace the entire LCD, didn't fix it, yet they sent it back to me clearly with the same fault...
Second try, they replaced the inverter and "logic" board. This corrected it, but took them another 2 months, and they managed to damage the casing and stand in the process.
I didn't follow up the damage as I didn't want to be without my monitor for another 2 months and for it to come back pink or something stupid.
Ultimately, my monitor works now, and it's basically new inside, but wow, what a truly awful service!

My W240D-PVA developed the same fault.
First try, it took them 2 months to replace the entire LCD, didn't fix it, yet they sent it back to me clearly with the same fault...
Second try, they replaced the inverter and "logic" board. This corrected it, but took them another 2 months, and they managed to damage the casing and stand in the process.
I didn't follow up the damage as I didn't want to be without my monitor for another 2 months and for it to come back pink or something stupid.
Ultimately, my monitor works now, and it's basically new inside, but wow, what a truly awful service!