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No Input Signal

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#1 PossumNZ


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Posted 18 March 2014 - 04:36 AM

Hi Guys, Had a phone call from my Brother who has a HP screen  model 1740 connected to his computer with a cable, which has started displaying sometimes a message " No Input Signal" then turns its self off ( the screen).


If he waits sometimes the screen comes back on, most times he close down the computer waits a while and turns the computer back on and no problem.....then same problem, " No Input Signal"


He has checked and all cables appear connected okay.


Any suggestions please?

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#2 Platypus


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Posted 18 March 2014 - 04:54 AM

You need to take steps to prove whether the problem lies in the monitor or the computer. Usually the simplest way is to connect the monitor to another computer, and see if the same thing happens. It's also possible but probably less likely, that the signal cable is faulty, same principle applies - if the problem only ever occurs when that cable is being used, and not with another, it's faulty.


Just as an oddity, some video drivers have the option to reduce the signal amplitude to 0.7V instead of 1V - it would be strange for this to change, but if the problem proves to lie in the computer, it's one thing to check. Some monitors can tend to detect no signal at times with the lower setting.

Edited by Platypus, 18 March 2014 - 04:55 AM.

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