I have looked at every capacitor or resistor but I don't know what this kind is called.
Does anyone know what this component is called? It's just a letter "W" in a blue square.
This board is from a Smart TV 55" grafic board.
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It appears to be a fast acting ceramic fuse rated for 7 amperes.
It looks very much like the Littelfuse "437 Series – 1206 Fast-Acting Fuse"
This table from the datasheet says code W is 7 amperes:
They are possibly this 7 amp fuse: -