Question about Hannstar I-Inc TW-191D Monitor

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TW191D monitor has two input ports (VGA and DVI). Can I use the two ports for two different computers and switch between them without using a KVM switch? Currently, the only way that works for me is to unplug the signal cables and reattach the one I want to display.

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  • 11,361 Answers

Sorry, but only one at at time, it is not designed to be fed by two PC.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

Posted on Mar 14, 2011

  • absentminded Mar 19, 2011

    Thank you for your reply. I bought a cheap ($20) KVM switch as my solution.

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Posted on Jan 02, 2017

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What is the best way to connect 2 computers to this monitor


If you have two separate computers for different purposes, such as personal and work use, you may find it convenient and necessary to connect both to a single monitor. Many monitors have dual inputs, making such a connection simple. However, you might need a keyboard, video and monitor switch to accomplish this task if the monitor lacks a second input. Dual Inputs
Step 1 Examine the back of your monitor for the presence of dual video inputs, such as a single VGA and DVI or HDMI output.
Step 2 Connect the VGA cable to one computer. Plug the other end of the cable to the matching input on the monitor. Rotate the retaining screws until tight at both ends of the cable.
Step 3 Plug the DVI or HDMI cable into the back of the second computer. Insert the other end into the monitor's digital video input. Screw down the retaining screws if you're using DVI.
Using a KVM Switch
Step 1 Ensure both computers are turned off. Place the KVM switch on your desk where it is within convenient reach.
Step 2 Locate the video output port on the back of the KVM switch. Plug a VGA cable into this port. Plug the other end of the VGA cable into the monitor.
Step 3 Plug the VGA monitor outputs from each computer into the inputs on the back of the KVM switch. Tighten the retaining screws down for each connected VGA cable on the computers and the KVM switch.
Step 4 Plug the keyboard and mouse cables into their respective outputs on the KVM switch. Plug each set of keyboard and mouse cables from their ports on each computer into the matching inputs on the KVM switch. Plug each cable in sequentially to avoid mixing them up between machines.
Step 5 Double-check that the mouse, keyboard and monitor cables leading from each computer all correspond to the right machine. Plug the KVM switch's power cord into a nearby AC outlet or power strip.
Step 6 Turn the computers and monitor on to verify the connections are correct.

Required Items

  • VGA cable
  • DVI or HDMI cable
  • KVM switch
  • Power strip (optional)

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For Windows 7 or newer OS, it will cause more compatibility issues. It is not driver issue. A hardware-base KVM switch 99% of them doesn't need driver.
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No, a DVI to VGA adapter will not work. (The TV is looking for the digital signal from a set top box. This is different from the analog signal on the VGA cable.) You need a converter. Your best bet would be a VGA to component video converter. (I am assuming that the Sharp TV has a component video input.) This page has some examples: http://www.ramelectronics.net/audio-video/video-converters/vga-rgb-hv-to-component-video/c10000-c11200-c11215.html?sorter=productname-en-asc . Note a VGA to component video cable will not work. The VGA to component cables are for projectors that read the RGB signal. The component video signal is YPbPr.

Connect the VGA cable to the converter and the component video cable to the TV and the converter with the computer and TV off. Turn on the TV first and set it to the component video input and then turn on the computer. Then (assuming the VGA port is enabled - adjust in the BIOS if needed) set the computer's video output to the VGA port. (On my Windows 7 laptop, this can be done by right-clicking on the desktop. Choose Graphics Properties and set the display to the external monitor or both. Click Apply and then confirm the change (on the external monitor if using the single monitor). (VGA to Composite video converters also exist if you do not have an available component video input on your TV.)

If your computer is fairly new, you may have an HDMI port. Your TV may be able to read the signal with a DVI to HDMI cable. (It depends on the TV. Not all of them will read the computer's signal on the DVI port. Check the documentation for your model. TVs without a VGA port are less likely to support this feature.)

I hope this helps.

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Connectivity card from montior to CPU is different than other PCs, in back side of the monitor its showing to type VGA and other one DVi connector, In my CPU i dont have the slot for the DVi connector,...


DVI ==> Digital Video Input
If your monitor has both DVI and VGA inputs,
and your PC's video-card has both DVI and VGA outputs,
then buy a DVI-to-DVI cable, and use it, for a better picture.
If your monitor has both DVI and VGA inputs,
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Is your switch a SCxPDV or a SC4UAD? Regardless, if it's a DVI switch, you can try place a DVI-D cable in between your HP PC and the switch. Do the same between the switch and the HP monitor. I'm guessing you are currently using a DVI-I cable between the PC and the switch. Some video card/OS combo send out analog signal when you use a DVI-I cable on the PC, which would not be displayed if you are using the digital port on the monitor. To read up on the difference between DVI-I and DVI-D cables, check out http://en.wikipedia.org/wiki/Digital_Visual_Interface

For future Avocent product related questions, I suggest you post them at Avocent's user forum http://community.avocent.com as it's monitored by their tech support team.

Hope this helps. Thanks.

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After Microsoft splash screen the monitor goes blank except for "no signal" messages if I turn off/on the monitor. I checked the monitor menu. Under Misc dropdown the Input is empty. Clicking input bring s...


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The IOGEAR GCS632U is designed to work with VGA computers and monitors. Using the Mini DVI to VGA adapter is not guaranteed to work with this KVM switch.

The Mini DVI to VGA adapter can only convert the port, but it does not have an ability to convert the signal from digital to analog when it's connected to the KVM switch.

What you need to have is a DVI to VGA SIGNAL converter. Unfortunately, I don't have a model number handy, so I would suggest to contact IOGEAR, because I'm sure that they already have a work around with this issue.

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Is ether the monitor or video card uses both DVI or VGA port. There may be a switch on the graphic card that changes it from DVI to VGA, often outside the card.

Also is the computer monitor set to the right setting if it can use both VGA and DVI, if using DVI (of any type) it need to switch to digital, and if using VGA it need to be set to analog. This may be a physical switch or using the settings button. (see manual how to change them)


PS: VGA port is a blue D shaped port with 15 pin holes, and DVI is a white rectangle port with one port being a line.

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