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Hi guys,

I have a Sony PFM42X1 plasma display, and overall I am very happy with it. Its native resolution is 1024x768, but I am more concerned about its refresh rate.

I am using it as the display for a HTPC, via DVI. I can feed it a variety of resolutions and refresh rates and it accepts them quite happily. Of course it is going to re-scale any signal to 1024x768, but it appears that it is also converting the refresh rate to 60Hz. The on screen display shows the resolution and refresh rate of the signal in the top left hand corner of the screen, but it only ever shows 60Hz as the refresh rate, no matter what refresh rate I am driving the signal at. I live in Australia, which uses 50Hz PAL signals, so I would prefer to be using 50Hz if at all possible.

For example, I have set up the HTPC to output a [email protected] signal, but the plasma reports it as [email protected] I have confirmed that the computer is driving the signal at 50Hz, but the picture on the screen does not pan as smoothly as it could. This could be due to dodgey timing on the HTPC, but I don't think so.

It is my understanding that LCDs have a native refresh rate that can not be changed, and that it is usually 60Hz. Is this also true of Plasmas? If so, then that would explain what is happening to me.

The silly thing is that through the component connection, It will accept a 50i signal no problem, and that it will display on the OSD as a 50i signal too. I haven't done any A-B comparisons of the smoothness of panning of the two signals yet, so I can't be sure what is going on.

Can anyone help me? Are plasma displays locked to a particular frame rate?
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