Question about BenQ FP791 17" LCD Monitor

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Malfunction on VGA port

Hi, can j download a schematics of BENQ FP791 or similar from the Web?

Thanks for help in advance, Mario

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Re: malfunction on VGA port


why not

download it from given web sites.

hope this will help.

Posted on Oct 11, 2007

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The 9-pin port on your PC tower is NOT a video port, it is a serial data port. All VGA connectors are 15-pin. Hooking up to the 9-pin port will not get you a picture. There should be a VGA port on the PC, or else a DVI an/or HDMI port. You can get DVI-to-VGA adapters that work, but only if the DVI port is an analog DVI, not if it is a digital DVI (DVI-D or DVI-DD).

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usually for these kind of issues., here are some common steps that helps at times.
1. Check the VGA Cable that connects the Monitor to the Tower (CPU).
2. Reseat the Cable once.
3. Remove the VGA Cable & turn on the Monitor Alone. See if you get any display saying "No Signal" or anything similar. If there is some display, then it means that the problem is with the Tower (CPU) & not with the monitor.

Hope this small sugession helps.
Cheers!!! Have a nice day!!!

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Thank you for providing your configuration details.
You have failed to specify wheather or not your LCD Display is under Warrenty.

Perhaps these simple trouble shooting procedures will get the job done.

1. use the DVI to VGA adaptor that came with your card

Plug in a regular CRT monitor to the Primary Display Output Port using the DVI to VGA adaptor
( either port can be designated as the primary by you )
I like to use the Port nearest to the motherboard as the Primary

2. plug in the your LCD monitor on Secondary Display port using your DVI cable

At this point you should be able to see your desktop on the Primary CRT Display

3. Go to the display properties and use the Nvidia Dual Display Setup Wizard

set both desktops to CLONED at a resolution of 1024x768 and set the refresh to 60Hz
which is default for most LCD displays , some have higher refresh rates , consult your user manuel

If the display resolution and refresh are set incorrectly for your CRT or LCD you will see
Signal Out of Range ( if the display has the ability to display that error message )

At this stage both displays should be showing a Windows Desktop

If you now see your desktop on both displays , you can now put the LCD on the Primary Port

No Signal Detected ( this means the display device is not receiving a signal )

If your LCD display is still displaying the error message
"No Signal Detected" after performing the trouble shooting proceedures
You may need to read the user manuel about how to enable DVI signal input.

If you are certan you have done everything correctly but still see only "No Signal Detected"

Your LCD Display may need replacement

Loch Hime :-)

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1. If possible RESET the setting from monitor.
2. Change theme from Operating stystem
3. If possible check monitor some other system for monitor's problem if colour problem persist may have to appraoch service center for solution

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There possible cause is your speaker because it is having electromagnetic which get disturbed by monitor. Both Magnetic field circulate in the direction and get conflict which affects your monitor. Not only it is not advicable to monitor also.

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