Asus VW246H monitor has backlight problem. I hooked VGA up to laptop and the monitor turns on but then 2 seconds later it goes very dim. how do i change the backlight settings?

SOURCE: screen comes on but goes dim within seconds

The inverter in the monitor is probably going bad. It can be replaced, depending on the size/age of the monitor. Many times it is cheaper to buy a new one than to have it fixed.

If you are a little handy, and can get the monitor open, you can find the inverter and replace it. The monitors have a high voltage area you have to be very careful around.

New inverters range from $30-75. They are very specific to the model of monitor. The best way to find one is to get to the inverter and search for the numbers printed on it.

A repair might cost you $100+

SOURCE: input select button to switch between hdmi/dvi/vga

Unless there is simply some dirt or dust caught in it, I would imagine that the button has lost its 'spring' or bounce-back ability which means that either you can take the big risk of attempting to fix it or come up with some other clever way to give it bounce.

SOURCE: HANNSpree monitor screen going blank

Sounds like either the inverter board is failing - or it may be the power to the inverter board. Look up your model# on eBay and you may get some insight as well as a source of parts.