There is no positive or negative polarity to a fuse. A fuse is just an in circuit protective device designed to blow when there is excessive current flow. A shorting transitor, coil or numerous other components in the power supply circuitry can cause this. Take power supply to television store, this will save you a fee from them having to come out, and have them diagnose the power supply, which they are good at. You might want to consider going online and ordering a new power supply.
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