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Hi there, my viewsonic monitor VX912 is not getting a signal from my computer. I first checked to see if the connections were good. No joy ther! so I then tried to see if the cable was faulty(my monitor has two inputs:D-SUB a blue cable and DVI which has a white cable) by connecting my laptops TV-OUT port to my TVs PC port. Got a signal but then after a while a message came up saying "unsupported signal please set PC output" and then I lost the signal, so I guess the cable is fine?I did the same with my laptop, connected the TV-OUT port but this time to my monitor. The same thing happened, My monitor came on for a while and then went into standby, so the signal was lost. Does this mean so far that both the cable and the monitor work? Please Help!! Many ThanksMy e-mail address is:

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Is your tv HD, it may have worked on the digital signal, but perhaps it switched to a HD program, and it doesnot support that HD signal, If not it may be a switching problem

Posted on Dec 16, 2008

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You need to get/buy/download the service manual and
schematics, so you can then trace and analyze the circuit.

A strong knowledge of electronics is required to do this.

Analysis is complicated by the fact that all key functions
within the monitor are controlled by software running on
undocumented digital control chips. The chips are called
ASICs, or application specific integrated circuits, custom
designed for the manufacturer, and programmed with secret

Beyond obvious voltage and continuity checks outside
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electronic appliance.

There is no magic solution nor red and green "what chu mah
callit to replace"

I have thirty years in electronics and a degree in computer
electronics, yet I stopped fixing monitors years ago.
There is no percentage in it.

I just bought 4 x 21" hi-resolution wide screen monitors,
with 5 Millisecond pixel time constants and 1000:1 contrast
ration for $180 each,

and sold of my 3 year old monitors for 15 bucks each at
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