My sreen is dark on my dell E153FPc when i cut it on i can see but it goes dark after like 2 seconds is it the contrast

My sreen is dark on my dell E153FPc when i cut it on i can see but it goes dark after like 2 seconds is it the contrast? This trouble maybe power supply or inverter boards is defective.
first you can test the voltage of the multr,and then check which part is defective.From Wisiny.com can find those parts
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1521HSD1 715L1074 PWPC1521XXD1 Dell ADTV1521HSD1 Power Supply Backlight...

Not hte setting problem, but more likely to be problem in the power supply /inverter circuits due to bad caps, shorted transistors, cold solder joints.
If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, 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 DELL 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.

Basic LCD monitor troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting

http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Replacement board: http://www.lcdrepair.us