text: how do you test and/or repair a lcd monitor.? i have a viewsonic va720, the power light comes on and stays on, but i can not make out any displays.  the monitor worked one day and not the next.  i know i can replace th backlight inverter would cost about $80 after shipping.  any way i can know if a new inverter board would fix the problem.  or at the least someone who could test the board before shelling out 80 clams.  the details: mfg  viewsonic model  va720  vlcdsz3895-3w  the symptoms: power indicates on no picture picture did not dim over time worked one day not the next  will $80 fix it? less? more? depends?    i guess as a last resort i can track down a used model, swap parts, and diagnose.  any tips of the trade would be appreciated. the classic diagnosis for back light failure is shining a light onto the tft to see if you can see anything.  i think your backlight has gone - so go with this