Go to the Lagom LCD monitor test at lagom.nl/lcd-test and see if you can calibrate the monitor using the test pages. If that doesn't work, get yourself a colorimeter (what a great word), a device ...

Samples from the Lagom LCD test page At this point, I decided to start tweaking the display – sadly NEC didn't supply the screen with the X-Rite sensor required for calibration, but for the most ...