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.
I opened the LCD monitor and there were no bulged capacitor, all voltages seems to be good. May I know what is the cause of the problem?
If the power went off after few minutes, it is either
1) dry joints in the power side
2) bad e-caps or
3) bad power IC
I have seen power IC causing this problem. When I sprayed the power IC using coolant/freezer the power no longer shutdown. So I know is the power IC fault. Once I have replaced the power IC, it came back to life again and no longer shutdown. This means you check for dry joints and bad e-caps and if you did not find any problem then direct replace the power IC and retest.