Can’t get iMac VGA 1920x1080 output on Samsung DLP ?

[HTnewbie]

I am a very happy owner of a Samsung HL-R6168w. Yesterday, we finally hooked up my kids’ iMac G5 to the 6168 via their respective VGA ports. We had no trouble getting the image to display at all 6168-supported resolutions up to 1280x1024 (at both 60 and 75Hz).

However, we are unable to display at the 6168’s highest supported resolution of 1920x1080. Since this is a 1080p display you would think there would not be a problem. The iMac supports far more resolutions than are shown in the 6168’s compatibility chart below. As you will see in the notes, the Samsung manual says the optimal resolution is 1920x1080 at 60. However, when we set he iMac’s output to that level, we get an error message from the 6168 about an incorrect signal.

I am not display expert so I ask for assistance. I do note that the 6168’s chart indicates support of 1920x1080 at 59.988 Hz – is that different from the 60hz the iMac outputs? Also, the vertical polarity for this resolution in the chart below is shown as negative – what’s that about and can I make that happen with the iMac?

I have not tried the 1920x1080 from a PC but will try that tonight. In the interim, any thoughts would be appreciated.

Tom


Excerpt from Samsung manual:

Resolution VertFreq[Hz] Horiz[KHz] Vertical Horizontal Polarity
640 x 480 72.809 37.861 N N
640 x 480 75.000 37.500 N N
800 x 600 56.250 35.156 P/N P/N
800 x 600 60.317 37.897 P P
800 x 600 72.188 48.077 P P
800 x 600 75.000 46.875 P P
1024 x 768 60.004 48.363 N N
1024 x 768 70.069 56.476 N N
1024 x 768 75.029 60.023 P P
1280 x 1024 60.020 63.981 P P
1280 x 1024 75.025 79.976 P P
1920 x 1080 59.988 66.647 N P


NOTES
• The Modes Table conforms to the regulations of IBM/VESA and is prepared based on analog input standards.
• The optimal resolution is 1920 x 1080 @ 60Hz.
• The optimal timing per each mode is the Vertical Frequency 60Hz.
• Resolutions other than the resolutions above are not supported in PC mode.
• Although the OSD menu may shake when selecting a PC input of 1920 x 1080, this is not a defect. Therefore, please use the unit as usual.

 

[XtremeM3]

I don't know if this will help you or not but I thought I'd throw it out. I have a 50" Samsung Plasma, and when I hooked up my Xbox360 via the vga adapter to the Samsung it gave me more options in my TV menu. One of the options it gave me was an "auto adjust" or something like that(actually 2 similar menu items, one did nothing the other did). At first the image was unrecognizable, then when I hit that(a couple times) it took a few seconds and was able to sync the picture (720p the max res on mine). i'm not sure if it will help but I thought maybe your Samsung might have the same option. Good luck with it.

Jeff