ViewSonic LCD Monitor Went Off After Few Minutes

Dear sir,
One of the LCD ViewSonic VA1931WA-2, complaint was it went off after 3 to 5 minutes. I connected the VGA cable and power on, Viewsonic logo appeared but after 5 minutes power went off. The power LED also went off. I pressed the power switch but i didn’t work, I switched off the main power and connect again display will come, but after 3 to 4 minutes power went off again.

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