My HDMI Inputs stopped working. I've tried multiple sources in both jacks. I'm currently working off the component inputs but limited in several ways.

Troubleshooting Tips 1. If your HDTV or TV has multiple inputs, make sure you choose the right input your DVD player is connected to, such as Video, HDMI 1, HDMI 2, HDMI 3, Component, etc. Change the INPUT or source the HDTV is set to by pressing the INPUT button on the TV or its original remote. When you try different inputs, let the DVD player play a disc and output a constant signal.
2. If your TV has the correct INPUT or Source, unplug the cable and plug it back, or try another cable or port. Sometimes cable can short-out. Be sure they are connected securely.
3. Test if your DVD player works on other TVs. It could be your DVD player breakdown that leads to No Signal on your HDTV.
4. Try connecting your DVD player to another HDTV if your DVD player works correctly.
5. Check if your DVD player is compatible with your HDTV.
6. If the TV does nt work try to upgrade your DVD.

Your description is somewhat confusing. Most TVs today have component inputs with limited composite inputs. If you have the red green and blue video input Jacks, that is component. The single Yellow Jack is composite. There are adapters available on the internet. You don't need audio in the adapter because audio out to audio in from DVD to TV is the same regardless of the video input. Another option if your DVD is the single yellow output is to convert that to HDMI for which adapters are available. Hear you do have to use the audio jacks to the converter for the HDMI cable to function. Otherwise more information is necessary.

This is a 720P TV, please try set up your Samsung DVD play video out put format to 720P, then try it again.

Did you switch the Xbox HD switch to the off position?

Maybe the problem is not from cables but from HDMI hole/jack, rusted or something

Your setup has a TV/Monitor and a audio/video box. The A/V box is connected to the TV and other source inputs connect to the A/V box. Hookup your cable box to the A/V box either using component video (green, blue, red) RCA cables from cable box outputs to the A/V box inputs OR the A/V box also has a DVI/HDMI input jack which may work using a HDMI cable.
Select the proper source.

The tv display resolution will automatically change depends on your source/device output resolution and TV inputs used as well. Television component and HDMI inputs accept 480i up to 1080p signal while composite and s-video accepts 480i(lowest resolution) signals only. You will get high resolution signals from cablebox, game consoles, bluray etc through their component or HDMI output jacks.

Check to see if input 5 has a audio in source via RCA jacks. Many times manufactures will give you multi HDMI inputs but only one that has RCA jacks in case you are running a DVI/HDMI cable. If input 5 does not have those RCA jacks you will not have sound. I know this unit has multiple HDMI inputs. Look to see if any of the other HDMI inputs also have RCA jacks.
I hope this helps,
Skyassoc

Bad input board BU or AU

Check multiple inputs and multiple sources. Check your dvd player; does it happen there? If not, you are probably right to suspect the cable box.

When you are checking multiple inputs, you want to make sure that if your cable box uses component or HDMI, that you check your DVD player on the same style input.

The reason for this is that your electrical chassis treats the analog (composite, s-video) inputs different from the HD and digital inputs (component, DVI, HDMI).

If you try your DVD player and cable box on the same input and experience the same probelm, you probably need to have the electrical chassis rebuilt in order to fix a problem on the tv's FMT board.

Cost: $800+
Wait time: 4-8 weeks.