Take face plate(gray color) off and remove 10? screws that hold the lcd in place. Then remove power ribbon(mark placement with marker),then carefully remove lcd.Now remove 2 serial port bolts and slide off cover to reveal pcb boards. Look for the board that has the 2 copper windings and remove. Look for soldering joints that look dull and reheat with soldering gun and flux if needed, should work like new!!!!!!!
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Pleasec look through my albums so you will know what to look for.
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums Post back what you see inside so we can guide you further and it will help out other people in the future also. http://en.wikipedia.org/wiki/Capacitor_plague http://www.badcaps.net
It is possible that your the lcd inverter board is failing or possibly the back light, i suggest taking the back cover off the monitor and checking the power board for leaking or slightly buldged capacitors, to spot this youll have a dark liquid traces on the cap or on the board, the top of the cap must be flat not bulged, if there are any they'll need to be replaced, you can get them from electronic stores like Maplins, and if you are able to use a soldering iron desolder the the ones of the board and solder the new ones on. Make sure you get the exact farad rating of the caps, it dosent matter to much about voltage as long as it is equal or above the voltage stated on the cap. Also insure that they are replaced the correct way around, check this before desoldering from board.
check the board postings for the HP f1903 monitor.I recall seeing a problem of the same there and a solution or fix. As it is only a newer version of the same model, it may be the same fix. Appears HP has a big problem with QA and this particular model. Lots of people have same or similar problems, and all appear to have a similar fix or solution. Tricky part... figuring out how to "Open" the monitor to check it inside!
PS - if you figure out the opening part, let us all know!