I have a little problem. EU Sony KV-36HQ100 100HZ connected by VGA to SCART RGB cable. Both in 720x576i and 1024x576i when used forced 50 Hz refresh and 15.625 kHz for the best picture
and with removed horizontal overscan on small bottom part of the screen appears very heavy ghosting.
When motion begins top and bottom part of the screen is shaking left-right slightly, from time to time.
When I use standard CRU (Custom Resolution Utility) timings (something like 51,5 HZ) the problem is not there, but image is much worse (lower resolution).
I know overcan has a purpose but anybody has a clue what is going on ?
Thank You very much for help.
Last edited by HQ100 on Sun Nov 26, 2017 8:05 pm, edited 3 times in total.
Fudoh wrote:To what end do you want to use a 50Hz timing at all ?
Perhaps he's looking to get the highest desktop resolution compatible with his TV? 576 interlaced lines at 50hz where 60hz would be 480 interlaced lines.
@HQ100 what happens when you change the modeline HV sync polarity?
Fudoh wrote:To what end do you want to use a 50Hz timing at all ?
Perhaps he's looking to get the highest desktop resolution compatible with his TV? 576 interlaced lines at 50hz where 60hz would be 480 interlaced lines.
@HQ100 what happens when you change the modeline HV sync polarity?
50 HZ = the biggest resolution. I tried 2 "CRU" utility standard CRT combination: 15.125 kHZ/50Hz and
16.625 Hz/51.625 Hz with 20 lines cutted (605 vs 625 ). Problem is not here, but visible screen quality is much worse.
This TV accept any polarity combination. It looks like the problem can be resolved only by adding overcan or using smaller vertical resolution. Ex. changing front porch from 2 to 7 disables this affect on bottom (=less vertical lines ...) , but at the top, periodic shimering is still visible. So I will stay with overscan having a little cutted, but the best avaiable picture.
So it look like about only 550 lines could be visible without distortion.
Last edited by HQ100 on Sun Nov 26, 2017 8:07 pm, edited 1 time in total.
I know that, but what's the point if you can't run any emulation or games that are intended to sync at around 60Hz ?
I mean, just out of curiosity, what do you intend to display at 50Hz ?
In this particular TV setup I wanted to look at retro films too ... My TV of course is working at 60 Hz/120Hz, but for film watching I want the best resolution, and 50 Hz flickering is removed by internal frequency doubling to 100 Hz.
Last edited by HQ100 on Tue Nov 28, 2017 1:04 pm, edited 3 times in total.
I know that, but what's the point if you can't run any emulation or games that are intended to sync at around 60Hz ?
I mean, just out of curiosity, what do you intend to display at 50Hz ?
It makes sense to use the highest resolution available when using the desktop. It doesn't mean you are restricted to that resolution and/or refresh rate when running games or emulators.
Most stand alone games will allow setting of the resolution and refresh rate you wish to play within an options menu.
Groovymame will auto switch to the closest resolution and refresh rate of the game selected and retroarch can be configured to run at the native resolution and refresh rate of each console system / core.
