Question about ViewSonic VX900 19" LCD Monitor

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VX900, Backlight Works, But no picture.

I got it basically for $5 because it doesn't work, so I figured it was worth it if it can't be fixed.

• The unit powers on fine, power led stays green.
• Without a cable plugged in, it says no signal then goes blank and power led turns amber.
• When I plug in a VGA cable (have not tried DVI-D as they are $35 around Toledo) the power led turns green, the screen lights up, but it is a black picture.
•I have taken it apart and visually inspected all the boards, and everything looks fine.(such as the caps, resistors, fuses "Look" okay, coils, wires, everything)

I don't have a multi-meter, so I can't check things as well as I could.
If anyone has any ideas, please let me know and thank you in advance.

Simon.

Posted by on

  • Bruce Smith
    Bruce Smith Feb 15, 2009

    When I turn the monitor on, the screen comes up all white and displays "BURN IN ON" for about fifteen seconds, then goes away leaving the screen still all white. No buttons do anything except the on/off switch. The power supply measures 12.03 volts. Sorry, I haven't opened it up yet. I fix medical equipment for a living, not monitors, but am willing to give it a shot. Have scope, DVM and plenty-o-tools.

    Any ideas/suggestions?

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  • ViewSonic Master
  • 1,667 Answers

It is impossible to see defective components visualy, unless there was a serious burn-up or something like that.

Without at least a DVM you cannot even verify if the power supply is functioning properly!!!

There is no support at the component level service for these monitors. The service tech will change the main input board to solve the fault that you have. If the back plane lamps are failed, he will change the power supply for the back plane lamps. In some of these models, the back plane lamps are not replaceable. This means that the screen would have to be replaced.

If you want to service the monitor the non supported way, call Viewsonic and see if they will sell you a copy of the detailed schematics, and engineering data for the boards. Most monitor companies will not sell any schematics or service information to no authorized contractors for their service.

If you can have the details, get a digital scope, a DVM, a logic analyser, and start troubleshooting according to the service manual. This can involve hours of work to figure out the fault. Then you will have the task of seeing if Viewsonic will sell any of their proprietory EPROM's or processor type parts.

This is why when the warranty is finished on these monitors, they are not worth to send back for service. The shipping cost, plus the parts and labour can come out to more than the monitor is worth!

Jerry G.

Posted on May 19, 2008

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