I need a schematic for a TV model kv-20ts20. I am want to learn how to fix tv's on my own. The TV that I got now is acting up. The color is disappearing and the volume is almost gone.So I would like to fix it on my own.

Hi,
Could not find the service manual for free. The Sony site was down and so the owners manual was unavailable at the moment. I did find service manuals at a variety of prices; this site was lowest:
Search Results Service Manuals, Owner's Manuals, Repair Manuals, User Manual, Circuit Diagrams Manuals-In-Pdf.com (http://www.manuals-in-pdf.com/index.php?main_page=advanced_search_result&keyword=KV-20ts20&forward=plist)
Understand that working on TVs is not for the uninitiated; the anode of the picture tube can KILL. There is a technique whereby you discharge the tube before removing the circuit board on the end with a screwdriver and then wiring the terminals to keep it discharged while you work.
Peace,
Clarke