Just for giggles you try and degass it? I picked up a computer monitor not that long ago that the person tossed because they couldn't get the picture fixed. I degassed it an its worked like new ever since. You said you tried a composite cable. Ever try a different set of HDMI/Composite cables? My brother-in-law picked up this usb capture card and we discovered the composite cable was broken in the middle(didn't find it until we unhooked it to find it was super soft in the middle). Just my two cents.
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