Thermal Fuses

[barrymagrec]

Suggested procedure :-
Remove the blown cap.
Measure across the large cap - it will probably measure short but the fault is most probably elsewhere.
Remove the TOP 261 - short probably goes away.
Check all diodes on the mains side - this can probably be done in circuit - 0.6 volt forward drop, something more reverse, if in doubt lift one end.
Check all resistors in the area.
Check the O/P connection for a dead short

Replace any faulty components, this will almost certainly include the TOP261.

[Puffin]

Thanks Barry.

[kevinkr]

I think Barry has put you on the right track. Just wondering if that cap failed due to a transient or defect or failed as the result of something else failing first. Be sure to replace that cap with the exact same type which I suspect is probably an X2 - hopefully it is still legibly marked on the case.