So I have situation where I have an old television connected to a uverse box via coaxial cable (its the only input on the tv). Is there any way I could connect a Blu Ray player to the uverse box (say via HDMI or component) and then to the televsion?
kylilin - Probably time for you to consider a new TV. Flat panels are readily available, even used, low prices & you can take advantage of your input devices.
Your TV has only a coax input?? No yellow RCA jack?? That is really old.
The blue ray jumps two levels of technology. First there is COAX (RF), then composite (yellow RCA jack), the s-video, then component & HDMI.
Your blue ray needs HDMI to maximize value. Probably does not even have anything lower. Many years ago there was a very inexpensive RF generator for those games that only had a composite output. But, that jumps only one level.
If either the TV or the blueray has a composite jack, you can probably come up with a converter, but it is really time for new TV.
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