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Have you tried changing the video output settings on the PS3? It may just be on a setting that the TV does not support. For instance, if the poutput setting is 1080P, and the TV only supports up to 1080i, you would get a "not supported" signal. Hook the ps3 to a tv that it works on...turn it on, go to settings- display settings-output settings- select HDMI as the connector type- if it asks for 3D tv size...select the size- now you need to set the resolution...select all resolutions that the TV supports, since it is a dynex...it is likely a 720p TV. So I would start by selecting only 720p, and then hook the system to the Dynex TV and see if it works now. If it works, you can go back in and attempt to select 1080i or 1080p to see if they work... but again, being a Dynex, it is probably only a 720p TV... The PS3 is likely trying to output a 1080i or 1080p signal...which that TV doesn't support.
Connect the audio/video input of the component cable into the "A/V" port located on the back of the xbox 360
Match the red, blue and green cables on the other end of the component cable to the corresponding component ports on your HDTV. If your HDTV has more than one set of component inputs, make note of which one you use.
Slide the switch on the component cable to "HDTV."
Turn on your HDTV. Set the video mode to the component port that will be used. HDTVs with multiple component ports will usually be labeled "Component 1," "Component 2" and so on
Turn on the Xbox 360. Go to "My Xbox." Select "System Settings" then "Console Settings" then "Display" and then "HDTV Settings." Choose the display setting (720p, 1080i and 1080p) that is best compatible with your HDTV. If you're not sure, try them all until you find the one that looks best.
Disconnect any previously connected A/V or component cables.
Connect the HDMI AV cable connector to the "HDMI AV" port on the Xbox 360.
Connect the other end to an available HDMI port on your HDTV. If your HDTV has more than one HDMI input, make note of which one you use.
Turn on your HDTV. Set the video mode to the HDMI port that will be used. HDTVs with multiple component ports will usually label them "HDMI 1," "HDMI 2" and so on.
Turn on the Xbox 360. Go to "My Xbox." Select "System Settings" then "Console Settings" then "Display" and then "HDTV Settings." Pick the display setting (720p, 1080i and 1080p) that looks best on your HDTV.
Check and replace its main system control section memory IC. It has damaged. Contact any experienced service technician. Even though the component is very cheap to buy and easy to get, replacing the same is a skilled work indeed.
What cables are you using for the XBOX and the digital box? What surround sound system are you using (what receiver)? Which model of Dynex 32" TV do you have? Looking at the DX-L32-10A, I can connect both devices to the TV and then the audio out to the surround sound system.
If HDMI, then that will carry the audio to the TV and then you would need an audio cable from the audio out on the TV to the surround sound speakers. Similarly, if you use component video and the audio cable combination, there are 2 component video jacks and 3 audio-in jacks on the rear of the TV. Then connect another cable from the audio out of the TV to the surround sound system. (This TV has one audio out and a headphone jack.)
If you previously had the audio going from the Rogers digital box directly to the surround sound system, you need to reroute things unless there are two or more sets of audio in jacks on the surround sound system. Some surround sound system can take several HDMI in cables and then route it to the TV on a HDMI out port.
Without more information, I can't be sure of the best option for your cables.
I hope this gets you started and please provide more information for additional suggestions.
Are you using hdmi cable. If so your hdtv needs to have it's hdmi port reset .First unplug everything even the TV and xbox. Then disconnect everything and unplug every thing from the wall outlets. Then plug the TV back in and hook everything back up. The HDTV even with the power off can have it's hdmi port bumped so you need to unplug it to reset the ports.