First off we need to understand what a fuse is. A fuse is a safety device, primarily designed to protect something from fire or damage. A normal fuse is simply a small wire running from one electrode to another electrode and encapsulated in some kind of fire proof casing.
 
A fuse should not be confused with a circuit breaker. A circuit breaker has the same purpose as a fuse, but it can be re-set and used again. A fuse has to be replaced when it blows.
Fuses, especially ones found in a television, can be very deceiving and hard to find. They come in many shapes and sizes. Other components like; resistors, or coils, may also do double duty and act like  a fuse. This behavior is engineered into the component.