Viewsonic VX910 display goes off and on.

Hello, This sounds like an invertor problem. Like I've said sometimes on fixya the LCD displays are very often confused with other types of displays and some people don't exactly know how one works. These "lcd" monitors are properly called TFT pannels (Thin Film Transistor). So, your display is composed of an area of small transistors, milions of them forming a matrix, 3 transistors for each pixel you can see on the screen. Each transistor handles one primary color (Reed Green Blue - RGB). However, they don't actually produce light or those vivid colors. They can only allow a certain wavelenght of light to pass trough it, blocking the other ones. They produce one color by blocking all others. However a TFT pannel doesn't produce light on it's own. If you power on a TFT pannel you'll see a black screen, altrough the pannel is working. Instead, your monitor uses a small fluorescent lamp, it gives the required light for your monitor to be bright and also for these transistors to filter. Now back on your problem. That small fluorescent lamp is powered on by an invertor circuit that is used to raise the voltage to the level used by the lamp. It's a common problem that these circuits may fail for diferent reasons. Power spikes over the mains, some mechanic shocks, poor design of the circuit itself, all of them can have resulted in your current problem. However this isn't a hard to fix problem. If I were to answer your question in the post - yes, it's worth fixing it. As I've said, the TFT pannel itself is working properly, you're having problems with that lamp's inverter. Simply take the monitor to a service center, ask them to check the inverter and power circuits and it will all be ok. This shouldn't be an expensive repair. Your problem may come from other reasons however, but the one explained by me before, is the most probable and common along this monitors. You may want to ask them for a price estimate before they actually repair your monitor. Just to be shure. I hope this will help in some way. Good luck and please feel free to ask further questions regarding your monitor.

If you mean that the screen cannot be viewed because it goes dark, then the backlighting is faulty, and i don't think a repair is economical. Or if you mean the the monitor turns on and off and displays no signal, just check the vga connections, if there are no bent pins then there is an internal fault, again with prices of LCD monitors coming down, it's not worth waiting weeks for it to get repaired when you can pick up monitors cheaply.