Could you be more specific about what you mean by "barely see"? Is it like the screen is not being illuminated? Is the screen OK when watching something else, such as a broadcast TV channel (that doesn't use the Roku)?
If you are referring to the image being very dark, that sounds like the backlight in your TV has failed. For a modern digital TV, there's several different methods of illuminating the screen. One is plasma, which I don't think is in use anymore as they were limited to 1080 resolution. Another is using a fluorescent light behind the LCD panel. This is the most common light used on inexpensive LCD TVs. Another is with LED lighting either directly behind the LCD panel or indirectly from LEDs along the edge. And the latest technology is OLED, which has some similarities with plasma but instead uses LEDs themselves as the pixel elements.
Odds are your TV uses the fluorescent light behind the panel, and the light has failed. The cost of repair is likely as much or more than simply replacing the TV, with the larger screen sizes perhaps more cost effective to repair.
Dan
Roku Community Streaming Expert
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