Matrox G450 > AA 9A60 > RCA F38310 = 1080i problems - AVS Forum
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post #1 of 3 Old 06-10-2001, 11:35 AM - Thread Starter
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Longtime lurker, first time posting...

I have successfully connected the equipment and generated the following signals:

640x480p - Hor scan rate = 34.991, vert = 57.837.
720x480p - Hor scan rate = 33.768, vert = 59.978.
848x480p - Hor scan rate = 33.739, vert = 59.927.
960x480p - Hor scan rate = 31.500, vert = 60.000.
960x540p - Hor scan rate = 33.810, vert = 60.053.

The 640x, 720x, and 848x all fit entirely on screen, but both 960x resolutions have vertical overscan - about half of the title bar is missing at 480p and the entire title bar is missing at 540p. I got the overscan problem under control at hsr ~ 35, vsr ~65 but I didn't like the signal (some warping and flashing going on).

When I try to send a 1920x1080i signal, I get a strange result. The image shows up as two side by side images - i.e., the mouse appears simultaneously in the middle of the screen and at the far left. The image also flickers significantly. It looks like the two interlaced images are being presented at half the screen width, with one on the left and the other on the right.

Other (generally unrelated) observations. There is a streaking of text in the menus and in the onscreen computer display. I noticed it first when I had a web browser upen, but later noticed it in the onscreen menus as well. A blurred white streak stretches out to the right of black text. Very annoying while web browsing.

Questions:
1. Are there other 480p resolution I should try?

2. Should I be concerned that the 480p resolutions look best at a horizontal scanrate that is so far off of the standard 31.5?

3. Does the 1080i problem sound like something you've heard of before? I tried tweaking with powerstrip multiple times but am unable to "merge" the two images.

4. Would this problem be easily solved by a video card upgrade?

Thanks in advance for your help.

Brad

Pertinent information:
Video Card: Matrox G450 (5.51 drivers)
Operating System: Windows 2000 SP2
VGA Transcoder: AA 9A60
Video Input: YPrPb component input
Monitor: RCA F38310, newly purchased (recall status unknown)
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post #2 of 3 Old 06-10-2001, 11:54 AM
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Had a similar problem syncing the PS38000 and any 540p output using a Radeon card, although 480p signals came in just fine. I also ran into problems with the Radeon at 1024x768 with the Sampo 34" SME-34WHD5 although this resolution was just fine with a GeForce 2. I've not had the time to play with the GeForce/ProScan combo as yet.

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post #3 of 3 Old 06-10-2001, 01:41 PM
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Brad -

I don't know that it's bad but I would not feel comfortable pushing my Toshiba TN55x81 to a 35 khz horizontal refresh or a 65 hz vertical refresh.

Many folks setting up 540p base resolutions have found that it pushes the top and bottom of the picture off the screen. I solved it myself by slightly squeezing the vertical size in the set's service mode, but I don't know how to do that for an RCA.

1080i works ok on my Matrox G400 card, but makes the desktop jitter too much to be very useful for text based applications.

- Tom

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