LCD TV "mis-syncs" with video card

Kiwi · 2007-06-08, 03:12

Hi
I have an LCD TV hooked up to Media portal via VGA. VGA resolution is set to 1360x768. Graphics card is MSI 6600GT, driver 93.71.

About 1/2 the time I turn the TV on, it thinks the resolution is 1024x768 and displays a black band down the right hand side. Turning the TV off, or changing to another input, then back to the PC input, it correctly detects the resolution as 1360x768.

Probably just a badly designed LCD, but maybe someone else has come across this before and knows a fix.

Thanks

infinityloop · 2007-06-08, 07:47

which TV?

brand/model

Kiwi · 2007-06-09, 22:46

The TV is sold by an elecronics supplier in NZ called Dick Smith. The LCD panel is LG Philips, but I dont know if LG Philips is responsible for the rest of the electronics within the set. Im sort of hoping that a change of some timing parameters in the video syncing may allow the set to pickup the correct resolution first time.
Thanks

KevL · 2007-08-26, 16:55

Have you tried powerstrip to set up screen resolution?

It has the ability to adjust width and positions of sync pulse in the video frame.

This might help.

Kev

Kiwi · 2007-08-27, 02:43

Hi Kev

I havent tried powerstrip. One thing I did was drop the refresh from 75Hz to 60Hz and that seems to have fixed the problem. Being in a 50Hz PAL country, I would have though a 60Hz refresh would have made for jerky picture - but it hasn't????? The set doesnt allow 50Hz via VGA :-(.
I think I will try powerstrip as it seems to allow greatest flexibility with all these parameters

!!

Cheers

KevL · 2007-08-27, 16:10

Get hold of a copy of VNC.

This has the ability to display the desktop of 1 machine (say your HTPC) on another.

The reason this is important (essential????) is that with powerstrip you can fairly easily produce a video frame with timings which cannot be displayed on your HTPC monitor. This can then make operating your HTPC (and hence repairing your screen settings) a tad tricky.

If you use VNC then you will always have control over your HTPC even if you mess up the video timings as VNC doesnt seem to care about syncs etc..

Kev

dekkers · 2007-08-27, 19:34

Please look in the owners manual of your tv. Most of the time there are tables in it wich tells you wich resolutions/refresh rates your LCD tv can handle. If you follow those tables most of the time you see that the only good refresh rate is 60hz. Why this is done i don't know, it has something to do with the LCD panel.

2007-06-08, 03:12	#1 (permalink)
Kiwi Portal Member Join Date: Sep 2006 Location: Pukerua Bay Posts: 22 Thanks: 1 Thanked 0 Times in 0 Posts Country: My System	LCD TV "mis-syncs" with video card Hi I have an LCD TV hooked up to Media portal via VGA. VGA resolution is set to 1360x768. Graphics card is MSI 6600GT, driver 93.71. About 1/2 the time I turn the TV on, it thinks the resolution is 1024x768 and displays a black band down the right hand side. Turning the TV off, or changing to another input, then back to the PC input, it correctly detects the resolution as 1360x768. Probably just a badly designed LCD, but maybe someone else has come across this before and knows a fix. Thanks

2007-06-08, 07:47	#2 (permalink)
infinityloop Project Coordinator Join Date: Dec 2004 Location: 127.0.0.1 Age: 28 Posts: 5,831 Thanks: 144 Thanked 104 Times in 73 Posts Country: My System	which TV? brand/model __________________ regards chris MediaPortal Project Coordinator Test Team Leader Do not start to moan if something is not working as you want it to be. Remember that MediaPortal is Open Source. YOU can improve it!

2007-08-27, 16:10	#6 (permalink)
KevL Portal Member Join Date: Mar 2005 Location: Cambridge, UK Posts: 118 Thanks: 0 Thanked 1 Time in 1 Post Country: My System	A tip for using powerstrip.:- Get hold of a copy of VNC. This has the ability to display the desktop of 1 machine (say your HTPC) on another. The reason this is important (essential????) is that with powerstrip you can fairly easily produce a video frame with timings which cannot be displayed on your HTPC monitor. This can then make operating your HTPC (and hence repairing your screen settings) a tad tricky. If you use VNC then you will always have control over your HTPC even if you mess up the video timings as VNC doesnt seem to care about syncs etc.. Kev

2007-08-27, 19:34	#7 (permalink)
dekkers Portal Member Join Date: Dec 2006 Location: Maasdijk Age: 26 Posts: 98 Thanks: 0 Thanked 0 Times in 0 Posts Country: My System	Please look in the owners manual of your tv. Most of the time there are tables in it wich tells you wich resolutions/refresh rates your LCD tv can handle. If you follow those tables most of the time you see that the only good refresh rate is 60hz. Why this is done i don't know, it has something to do with the LCD panel. __________________ Greetz from the United Kingdom of Maasdijk

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2007-06-09, 22:46	#3 (permalink)
Kiwi Portal Member Join Date: Sep 2006 Location: Pukerua Bay Posts: 22 Thanks: 1 Thanked 0 Times in 0 Posts Country: My System	The TV is sold by an elecronics supplier in NZ called Dick Smith. The LCD panel is LG Philips, but I dont know if LG Philips is responsible for the rest of the electronics within the set. Im sort of hoping that a change of some timing parameters in the video syncing may allow the set to pickup the correct resolution first time. Thanks

2007-08-26, 16:55	#4 (permalink)
KevL Portal Member Join Date: Mar 2005 Location: Cambridge, UK Posts: 118 Thanks: 0 Thanked 1 Time in 1 Post Country: My System	Have you tried powerstrip to set up screen resolution? It has the ability to adjust width and positions of sync pulse in the video frame. This might help. Kev

2007-08-27, 02:43	#5 (permalink)
Kiwi Portal Member Join Date: Sep 2006 Location: Pukerua Bay Posts: 22 Thanks: 1 Thanked 0 Times in 0 Posts Country: My System	Hi Kev I havent tried powerstrip. One thing I did was drop the refresh from 75Hz to 60Hz and that seems to have fixed the problem. Being in a 50Hz PAL country, I would have though a 60Hz refresh would have made for jerky picture - but it hasn't????? The set doesnt allow 50Hz via VGA :-(. I think I will try powerstrip as it seems to allow greatest flexibility with all these parameters !! Cheers

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