It could also be the internal power inverter, light source, or cable. Could also be bulging capacitors on the logic board that could be removed and new ones soldered on, or the logic board could be replaced. Can be very hard to diagnose, and the parts are usually quite expensive and often non-returnable if it turns out not to fix your problem.
I recently looked at the NEC PA241W, Asus PA246Q, and a few Dell models. Decided to go with the Asus PA246Q, only being $460. I highly recommend it, although haven't had an NEC PA241W to directly compare against. On paper, they look nearly identical.