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1366x768 on Sharp LCD

post #1 of 9
7/26/06 at 6:54pm
Thread Starter 
Hi,
I have searched through this forum and others but I can't seem to find an answer to my problem.

I just bought a 45" Sharp LCD HDTV (LC-40C45U). It has a native resolution of 1366x768. However, the TV itself doesn't seem to recognize its own native resolution as a possible resolution.

I hooked up my computer (Sapphire Radeon 9600) to the TV with a DVI-HDMI cable. When I set the card to 1360x768, the TV goes into 1080i mode and displays a scaled down image in the center of the screen. If I output in 1920x1080, 1280x720, or 720x480, the TV goes into the appropriate HDTV mode, although even these do not display the computer image correctly but cut off 20 or so pixels on each edge of the screen.

I don't know enough about how video cards and monitors work to know if it's possible to force the TV into a mode where it displays an input at its native resolution of 1366x768. I'm not worried so much about getting the card to do 1366x768, I will be plenty pleased doing 1360 with 3 columns of black pixels on either side of the image. But the current options are unacceptable.

Does anyone know if I can get the TV to act like a 1366x768 monitor and display in that mode, without any scaling or anything? I will be very grateful for any tips. I've written to Sharp customer service, we'll see how that goes.

Is this a problem with Sharp? It seems like many people have been able to get 1366x768 TVs to display correctly simply by setting their cards to 1360x768.

Sorry if I'm not asking intelligent questions but this is extremely frustrating. If anyone can point me in the right direction I'd really appreciate it. I'm not afraid to tweak things and I'd be happy to learn more about exactly what's going on.

Thanks a lot,
Dave
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post #2 of 9
7/26/06 at 9:44pm
try using 1368x768.
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post #3 of 9
7/27/06 at 5:19am
Thread Starter 
I can't find a powerstrip setting that will create a working 1368x768 ...
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post #4 of 9
7/27/06 at 9:29pm
Dont know about your 45" Sharp, but heres what we did with the HP LCDs which are Sharps. You select the 1368x768 rez from Powerstrip (dont worry about the panel accepting it, its just to provide you with a custom rez for the vid settings of the vid card ) . Set the TV to 1366x768 and the vid rez to 1368x768 and then autosync and the 1368x768 will be mapped to 1366x768 on the panel which gives Dot to Dot on the panel. For more detail check out the HP LC2600n/3200n/3700 thread in the flat panel forum. Just hope the settings options are the same.

EDIT: In powerstrip, select the 1366x768 LCD custom rez and just change it to 1368 and add as a new rez, this should now appear in the vid card settings as a display setting option. Then do above. Hope this helps.

EDIT2: OOOOPs the above is using DVI, not sure about HDMI interface as later mentioned .
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post #5 of 9
7/28/06 at 9:56am
I am running into the same kind of thing with my 37" Philips. The resolution always ends up larger than the panel. I have an NVidia card and in the HD monitor settings, there is a place where you can select Upscan, Downscan, or Native... Native makes it larger than the LCD panel, Upscan makes it so you can pan around the desktop, and I selected downscan and it set a custom resolution that fits the screen perfectly (1200x676 in my case). This is a strange resolution and it has been great so far. Looks great, no problems... but am I loosing anything by not going through the trouble to find out how to run it in it's true 1366x768 resolution? And... I have heard about power strip again and again, but I have got it to work fine without powerstrip by using that resolution of 1200x676. So what exactly is powerstrip used for, and do I really need it?
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post #6 of 9
7/28/06 at 1:14pm
Whoa, I think your problem s your using the HDMI input to the TV. If I remember correctly the port may only allow official HDM resolutions 720P, 1080i. So unless you use the VGA in you are restricted by the TV.
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post #7 of 9
7/28/06 at 1:17pm
Well, my TV (Philips, not the Sharp discussed above) doesn't have a DVI or VGA input. HDMI is equal to DVI. My TV says it is recieving a 720p signal from my PC, because I can set it to be whatever HD format in display settings, but my resolution is 1200x676 and there is no problems I have noticed at all.
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post #8 of 9
1/3/07 at 8:12pm
I also have the lc-40c45u and can only run 1152x648 through the HDMI port. Is it a limitation of using the HDMI port? If it is, I'll consider returning it and getting another LCD.
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post #9 of 9
1/4/07 at 9:21am
Quote:
Originally Posted by pbadss View Post

I also have the lc-40c45u and can only run 1152x648 through the HDMI port. Is it a limitation of using the HDMI port? If it is, I'll consider returning it and getting another LCD.


LCD TV's assume that an HDMI input is comsumer electronics, as such they a such they assume a need for overscan to hide the data that should be in the "safe" area.

So unless there is a setting to turn off overscan for the HDMI input in your menu you will NEVER get 1:1 pixel mapping.

Also HDMI electronics aren't as flexible as DVI, frequently they will only take standard ATSC resolutions 480i, 480p, 720p and 1080i, so you can feed it a 720p resolution with underscan settings and get the full desktop on the screen, but it won't be 1:1 pixel mapping.

Unless you've got a DVI port, VGA port or a menu feature to turn off overscan you are SOL. So yeah you may need to take the set back.
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