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More likely to be bad backlights inverter in this model, need to check the surface mounted fuses on the inverter board. You also need to check the caps to see if it has any bulging top or bottom seals in the 12vdc power supply module also and make sure it is putting out 12vdc.
See my pictures here: http://s807.photobucket.com/albums/yy352/budm/VIEWSONIC/Viewsonic%20VX900/#!cpZZ1QQtppZZ20
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you. Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
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Failing Power capacitors. The capacitors hold the charge necessary to build up the voltage that lights the screen. When they leak or fail to hold the charge, the screen will cut out. It could also be a fault in the switch circuitry. Really needs looking at by a qualified technician.
Power drain the computer by removing the battery and power adapter and press the power button for 1 minute. then insert back in the battery also the adapter to your computer and start the computer.
If the solution won't work
, try using flash light on the monitor,if you can see anything on your screen, possible backlight is the problem, however to isolate also the issue you may use an external monitor to check if you can have a video using other monitor and if not? you may contact the tech support of your system for possible mechanical failure.
That power button internal switch has gone bad. They are usuallya rubber boot which presses 2 peices of foil together. Once it goes bad, it has to be replaced. No easy fix or temp solution.
I think you have the display shut off. the button on the bottom left will shut screen off. It will come on for a few seconds if you touch the screen, but will shut off again. just push the display button again and it should stay on.
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