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Discussion Starter · #1 ·
Just received a BenQ PE7700. Connected a notebook to it through RGB. Set display to 1280x720p. Saw bright vertical lines beside black characters in distance of around 1-2 inches.


Is it normal? Is it rainbow effect?


TIA
 

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It's not normal, but it doesn't sound like a rainbow.


Have you tried turning down the sharpness? Have you tried to calibrate it with a test disc?
 

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Discussion Starter · #3 ·
Joe:

Thanks for your reply.

That vertical bright lines remind me of ghost images when I hooked my PC monitor to a KVM switch and the switch to my PC. If I set the PC's display to a higher resolution, the ghost lines will show up. Usually it's caused by the KVM switch.


I will try to lower the PC resolution to see if the ghost lines go aways.
 

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That's called excessive edge enhancement (a kind of ghosting). Like Joe_M said, set your sharpness to zero. Also make sure you have good cables and your video card, or software, is not adding extra sharpness to the image. The lines could be due to signal noise being introduced from the laptop (or its video drive is not capable of providing a clean 1280 x 720 image).


You also may want to get a VGA to RGBHV cable instead of the VGA to RGB (that uses the component 2, analog, interface). The VGA to RGBHV is a digital signal (use the GBR button on the remote). That's what I'm using on my MT700 (the PE7700's brother) from my desktop computer -- no ghosting, etc. I haven't tried it with my laptop.
 

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This might not be your problem at all but when I used rgb connection to my pc I had a hard time getting a good focus on the picture. I have my pc desktop set to 720p. The projector was in widescreen mode. Then I flipped to real mode on the projector and the image resized ever so slightly and was completely sharp.
 

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Discussion Starter · #6 ·
CT_Wiebe:

I connected my NB to the BenQ PE7700 through the RGB-HD by using the cable coming with the projector. I also tried to turn down the sharpness(to negative) but the image becomes fuzzy and less impressive and manually focus has no use to sharp the image.


I guess the problem is in my notebook as you said. I will try a desktop with a high-end video card to see if it's still a problem.
 

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Discussion Starter · #7 ·
More findings:

BenQ PE7700 has a feature to fine tune PC to COMPONENT(RGB). There is a automatic option. This option tends to over-sharp the image and generate ghosting.

After the automatic tuning (or perfecting in BenQ term), if I change phase or frequence, I can reduce the ghosting with less sharper image.


I also tried a desktop with an old ATI 7200 card, its DAC is 350MHZ. It has less ghosting than my notebook which has a ATI 9600, DAC 400MHZ video card. Sort of interesting.
 
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