ss wrote:

On 01/02/2018 20:50, Harry Bloomfield wrote:
ss formulated on Thursday :
Ok here some images of the caps, back of board and front of board. The
cap wont pull out but then it may have welded when it exploded.

https://imgur.com/vCG2M8O

https://imgur.com/KhigJP1

https://imgur.com/71nQ3Pa

A much better idea of what we are looking at and it is a switch mode
type. The fuse is on the mains input side. If that is really intended to
be a fuse-holder, it is not one I have ever come across before. I cannot
see any obvious signs of damage, apart from the seriously damaged fuse.
Are there any obvious blast marks on the earthed casing etc.?

I suspect there is no fault, apart from the obvious one, that your FIL
was messing about with it live and managed to short the fuse to earth/
metal casing. With that sort of blasted fuse, if there were a fault on
the PCB, the likelihood is that those diodes would also be well blasted
too - they are not.

The earths are ok, no burn marks.
I dont think the blasted fuse is in a fuse holder as such as when I
check on ebay they look similar ie as if they are in a holder.

Do you think they make the wire-ended fuses by crimping these caps with
leads to standard fuses? I can see that soldering directly to standard
fuses might affect their construction in unpredictable ways.



--

Roger Hayter