The manual outlines several ways to connect the DC-T990 to a television, depending on the age of your TV.
The DC-T990 is designed as an all-in-one audio/video solution. According to the standard specifications, the system typically includes: Manual Home Theater Sanyo Dc T990 pdf
If you cannot find the specific PDF, most Sanyo home theater units from this era follow a standard connection protocol: The manual outlines several ways to connect the
which hosts a categorized list of Sanyo products, including home theater sets. Based on available technical data for the DC-T990
Based on available technical data for the DC-T990 and related Sanyo 5.1 systems: Audio Configuration
ManualsLib has a clean, web-based PDF reader. Search for directly. They offer a direct download option without aggressive pop-ups. They often index the manual under "Home Theater System" rather than just "Receiver."
: Connect a video lead from the "MONITOR OUT" socket on the unit to the video input on your TV.