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Sharp VGA connect to PC problem

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Old 10-11-2007, 04:29 PM   #1
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Default Sharp VGA connect to PC problem

Hello! We just bought a new Sharp LCD HDTV 26" Aquos. It has a VGA input which will work as a computer screen if the computer is already on. Unfortunately, if I reboot the computer the TV can't find the signal anymore. Every time I have to unplug the TV, plug in the normal dell monitor and change the settings on the computer then unplug the dell monitor and plug in the TV. Why doesn't the computer remember the settings each time I reboot? I called Sharp and they said that this is a problem with the TV-- that there is no way to avoid having to use a second computer monitor each time I turn the computer on and off again. But that is such a hassle that I can't imagine people are putting up with it. There must be a way to use the TV as the only monitor for a PC. We are running XP on a Dell. We got the upgraded video card option when we bought the PC a few years ago. Each time I reboot the computer I have to go to display settings and set the resolution to one of the listed supported ones (eg 800x600) and the hz to 60hz before I can switch monitors from the Dell to the Sharp TV. Any ideas how I can make the TV work as a monitor every time without using the Dell monitor?
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Old 10-11-2007, 04:44 PM   #2
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You should be able to change the resolution and reboot the computer with it remembering the setting. Try that without turning the computer off and leaving the Dell monitor connected until it reboots. If it still reverts back to the original resolution, then you will need to find what is setting it. It may be that Dell installed some utility to set the resolution. XP should remember the new resolution.
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Old 10-11-2007, 04:55 PM   #3
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If I reboot with the Dell monitor attached it does stay to the same settings and then I can switch it to the TV. Somehow if I reboot with the TV attached it changes to settings that don't work with the TV. The TV is a Sharp LC26SH12U (I just looked at the box).
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Old 10-11-2007, 05:00 PM   #4
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Originally Posted by rbinck View Post
You should be able to change the resolution and reboot the computer with it remembering the setting. Try that without turning the computer off and leaving the Dell monitor connected until it reboots. If it still reverts back to the original resolution, then you will need to find what is setting it. It may be that Dell installed some utility to set the resolution. XP should remember the new resolution.
I really appreciate your help on this. Do you think I need a driver from somewhere? I really don't know what to do. I will probably return it tomorrow if I can't make it work with my computer without switching the monitors back and forth every time.
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Old 10-11-2007, 05:07 PM   #5
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Or do you think it would help if I used one of the other ports? I am just switching the monitor cable (VGA?) back and forth but there are a lot of different ways to input into the Sharp HDTV-- maybe I can find another way to input that will work better? I'd have to find an adapter so it would work from my computer.
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Old 10-11-2007, 05:41 PM   #6
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my video card is a Ge force fx 5200 - do you think it could be the problem?
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Old 10-11-2007, 05:50 PM   #7
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No your video card should be fine.

Just for review. Have you set the resolution to say, 800x600, and rebooted the computer leaving the Dell computer monitor hooked up? If so, did that result in the resolution staying at 800x600 or did it revert to the original resolution? To be clear I'm also saying do not ever attach the TV for this test.
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Old 10-11-2007, 06:00 PM   #8
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Okay-- I noticed something new. If I leave the dell monitor on the computer and reboot it it will stay at 800x600 and 60hz -- but if I turn the computer off and plug the TV into it it will stay at 800x600 but it switches to 75hz and thus the TV gets no signal (I know it switched to 75hz because I change over to the dell monitor and it is at 75hz). I think this is the real problem.
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Old 10-11-2007, 06:26 PM   #9
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Make sure in your Display Properties Monitor setting is 60 Hz, not optimum. That could be the problem.
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Old 10-11-2007, 06:31 PM   #10
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Is there anyway to force it to always default to 60hz? Thank you so much for your time on this, btw, I would be lost without you.
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Old 10-11-2007, 07:18 PM   #11
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If you set the Display Properties in the Monitor Tab to 60 Hz, that should do it.
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Old 10-11-2007, 07:33 PM   #12
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rbinck called me... We talked... I found this:

http://www.sharpusa.com/files/tel_man_LD26SH1U.pdf

It says in there on page e56 you can use the thing in either 480 or 768 line mode... this means you should be able to set your card at 1024x768 or something like that instead of the 800x600 mode, which is odd to the monitor. You're tricking it into working in a mode it doesn't really want to support. Look at the actual modes it supports, try one of those...

That should help I think.... let us know!
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Old 10-11-2007, 07:44 PM   #13
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Ok, that makes sense. I couldn't find the manual because of the stupid dash being left out of the model number. Good catch houtex.

Anyway I was further thrown off by the fact that 800x600 apparently worked even though it is not apparently a fully supported resolution by the TV. That is probably why the TV is not reporting back the refersh rate.

Try using one of the 768 line resolutions that your computer will support and hopefully the TV will work.
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Old 10-12-2007, 12:00 PM   #14
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Thank you so much for trying to help me, both of you. I really appreciate it. I ended up downloading RefreshForce that forces it to stay on 60hz. Great little program. It works with only the LCD every time now. It gives me two options for pixels and I did choose the higher numbers. Thanks again!
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Old 04-30-2011, 09:07 PM   #15
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Default Same problem...different Sharp TV...please help!

I am so frustrated. I have an LCD Sharp HDTV and when I connect my computer to it with the VGA cable and change the input on my TV to the VGA input it shows no input - then I restart my computer and it shows the start up symbol for windows on my TV, then starts to flicker and the picture disappears and it once again says "no input". I have tried lowering the resolution on the computer but that doesn't work, it reverts back to I think it is 1064X768 resolution when I check it after hooking it back up to my flat screen monitor. I am currently upgrading to Windows 7. Will that help? Is it an issue with windows, my driver? I'm really frustrated! I went to download RefreshForce but it says it fixes the problem with Windows 2000/XP - doesn't say anything about Vista or 7 - help!
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