I have to repair a led tv with a blown fuse. On the power board the fuse required is a T4.0AH/250V fuse, but I couldn't find it at the shop. They gave me instead a radial fuse, claiming that it's the same. Is it possible to replace a ceramic fuse with a radial one or could blown other parts of the board?
It is unlikely that some random 4A fuse the shopkeeper has on hand (lacking any safety approval markings, at that) will match the characteristics of the ceramic fuse in terms of breaking capacity (perhaps 400A rating) and time delay characteristics.
So there is some risk of it nuisance blowing or not providing proper protection.