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Nope sorry this does sound like your control board is naffed and needs replacing , it sees the avi as no rf input is needed but will not switch to if to give you vision chroma and sound .
If it says "weak or no signal", this means your are not showing the correct input or have no channels programmed.
To find the the correct video input:
1. turn On the device you are trying to see
2. press the [input] button on the side of the TV until you get a picture (wait 3 seconds between pressing the button)
You program the TV by accessing it in the User Menu.
Also, You may access the inputs using the TV remote. Each input button (V4 and V5) may need to be pressed muliptle time to access the picture . When you press this on the remote you will notice the input change from Composite 1, Component 1, S-Video. V5 will show composite 2 and component 2. Using the side panel allows youto scan all inputs in case you are not sure.
How many video ports does it have? You may have to search through video 1, 2, 3, or switch the TV itself to component/HDMI depending, with the remote. Should be with an 'input' button.
My tv has a list with HDMI, SVIDEO, COMPONENT, PC, ect. and its a 1080p one, im just assuming all HDTV's have a list
When the tv won't scroll to the HDMI inputs, it means that the tv does not detect a signal on those inputs. This either means the tv has an issue and can't receive an HDMI signal(very unlikely) or there is no signal being sent from the source(converter box) The first thing I would do is unplug all output connections from the box except for the HDMI output and see if this gets rid of your problem. If not, I would be more inclined to think you have a problem with your converter box than with your TV. You could also try using the HDMI ouput of a DVD player if you have one.
JVC may allow warranty exception or some accomodation for 15 days out. You have 2 seperate issues
1. White lines spreading is probably a video process problem. I think this TV has 3 Boards inside. Middle one is most likely suspect followed by the one on the Right
2. HDMI input not working is because they were turned OFF. JVC TV's have a sensor that will shut off the HDMI if the TV's back cover is removed. This must be reset in the Service Menu.
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