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Something is wrong whith the HDMI jack it's self, or the electronic switching is not sensing a signal is present. In either case the board that has the HDMI jack you are using needs to be replaced. Most all these boards are double printed, Multi-layered or both which prevents replacing the jack it's self. I do have a question though, do you only have on HDMI jack on the unit or do you have another one available.
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It all depends on how you connected to the TV. There are 3 common ways, using HDMI, DVI or a VGA cable. Of the 3, only HDMI transmits sound from the computer to the TV. If you are using DVI or VGA, you will need to connect a cable from the audio out (headphone) jack on the computer to audio in on the TV. If you are actually using a HDMI cable, it is probably a setting somewhere.
Identifying available connections
The first step in connecting your computer to a TV or projector is finding an identical port on both machines. Once the matching port has been identified (one that is the same on both your input device and output device), you need the appropriate cable to connect them. This section contains a picture of the back of an Epson projector and its available connection ports; as well as descriptions of each.
The HDMI connection is very popular among display electronics. In fact, nearly all modern televisions and projectors feature HDMI ports. Most laptop computers support HDMI and it is becoming more prevalent on both desktop as well; even without a high-end video card. HDMI is quickly becoming the standard for all electronic equipment for its high quality signal and ability to carry both audio and video signals. The image to the right is that of an HDMI cable.
The VGA connection is the most common among both desktop and laptop computers, is found on most projectors, and some TVs. The VGA cable has a 15-pin connector on each end that plugs into a VGA port on each device. Due to the fact that most televisions do not support VGA, we recommend using HDMI for their wider range of compatibility.
Tip:VGA cabling is universal for devices that support it. For example, the if your desktop monitor that uses a VGA cable it, that same cable can be used by a laptop to connect it to a projector.
Note: If you are using an Apple desktop or laptop you need a VGA adapter to connect a VGA cable to the computer.
The DVI connection is newer than VGA and it offers a sharper image. Although the DVI port is not shown on the Epson model above, it is still somewhat common for projectors, not so much for televisions. It is mostly found among desktop computers for monitors, but some laptops have DVI connections as well (Apple laptops are more commonly known to support DVI than any other brand of laptop). Since finding DVI on a TV or projector is more difficult, we again recommend using HDMI cables.
Tip: There are special cables that convert from DVI to VGA or DVI to HDMI and vice versa.
The composite video connection is quite common on a TV or projector, but it is nearly nonexistent on modern computers. This connection is the yellow female cable on what is normally a three bundle of red, white, and yellow. The only time you should see this setup is on older video cards for desktop computers.
The S-Video connection is also commonly found on TVs and projectors, but solemnly on a desktop or laptop computer. This connection is a small step up from composite video, but is nearing obsolescence.
Connecting computer and projector or TV
After you've identified what connections are available on both your computer and TV or projector, you're ready to connect the cables. If the same connections are not available for both the computer and TV or projector, you'll need to purchase a video converter cable that converts one signal into a compatible signal.
For a desktop, you simply need to plug the cable into the computer and output device. If you don't see an image, you may need to change the display using the following steps.
Press the Windows Key.
Type Adjust screen resolution and press Enter.
Find Display and click the down arrow on the right-hand side of the box.
If you're connecting a laptop computer to a TV or a projector you'll often need to "send" the video signal to the display device. The key sequence to do this varies depending on the laptop; but usually it's either: Fn + F3, F4, F5, F8, or F9. For example, pressing and holding Fn + F3 at the same time on my laptop sends the video signal to my connected TV instead of the laptop's screen. The corresponding key used with Fn may be labeled as CRT/LCD or have a picture of a monitor on or close to the key. Additional help and information with switching the laptop display can also be found on the link below.
Switching TV inputs
Finally, if you're connecting a computer to a TV make sure it has been switched to the correct input. For example, if you connected an HDMI cable to your computer and the "HDMI 2" port on your TV, you'll need to switch to the "HDMI 2" input. This action can be accomplished by pressing the input button on your TV remote until the correct image is displayed.
Most newer TVs have a VGA connector on the back with the rest of the connectors. This is generally the easiest connector to use. You can get a VGA cable from a local computer store to connect between your computer video connection and the TV. If you have an old VGA monitor you are no longer using, you may find that the old VGA cable is removable - as they are on some monitors.
Alternatively, you can connect to an HDMI connector on your laptop / PC to the TV's HDMI connector (they should be labeled) using a standard HDMI cable if you have such a connection available. This is the preferred method if you have this connector available on both devices.
Third alternative option is if your computer (or TV) have a DVI connector. This connector can be adapted to HDMI. As an example, if your computer uses a DVI connector, and your TV has an HDMI connector on the back you could buy a DVI -> HDMI cable, or just use a HDMI cable with a HDMI -> DVI adapter on one end.
Once you have connected to the TV in one of the above methods, you then have to use the TV remote and change the 'input source' until you see your computer.
Side note: If you are using a laptop, make sure that your external connector is enabled - for Windows users, right click on the desktop and choose properties then Display. (Windows 8 users, choose screen resolution in the same location).
You can use either an HDMI cable or a VGA cable to connect your computer to your TV. Your computer has both HDMI and VGA ports. You can use either ports but you cannot use both or else your video card will crash.
Hi Jatinder Kumar ,
Yes you can connect your computer output to lcd tv through dvi-hdmi cable or vga-hdmi cable.
1. Connect to HDMI (DVI) : just plug in HDMI (DVI) out of PC or laptop to HDMI or DVI TV. Than select source from HDMI.
2. Connect to PC : Plug D sub to TV, select PC in.
It all depends on your video card & TV. You might be able to use a hdmi cable if both support hdmi. If your tv has hdmi & your computer has dvi you can get a hdmi to dvi adapter to plug into your computer. Hope this helps.