Having problems with your ViewSonic VX900 19" LCD Monitor ?

VX900, Backlight Works, But no picture.

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\015 I got it basically for $5 because it doesn't work, so I figured it was worth it if it can't be fixed. \342\200\242 The unit powers on fine, power led stays green. \342\200\242 Without a cable plugged in, it says no signal then goes blank and power led turns amber. \342\200\242 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.\342\200\242I 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.\015

Answers :

It is impossible to see defective components visualy, unless there was a serious burn-up or something like that.
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\015\012Without at least a DVM you cannot even verify if the power supply is functioning properly!!!
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\015\012There 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.
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\015\012If 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.
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\015\012If 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.
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\015\012This 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!
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\015\012Jerry G.
Repair Help & Product Troubleshooting for ViewSonic VX900 19" LCD Monitor

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