So things have progressed with my original aim which was to identify the failed switcher IC.
The front face of the IC had suffered considerable damage where it had blown making it impossible to determine the exact type of IC other than being able to read TOP2. I tried cleaning the face with various cleaning solutions to no avail.
As a last resort I asked a friend to pop it in his small ultrasonic cleaning bath, wow what a revelation, I could now clearly read the second number using a loupe and could pretty much make a good stab at the third, revealing TOP271.
Using Power Integrations datasheet for the IC type I'm able to determine that it can only be one specific TOP271 IC due to the package type, namely a TOP271EG
. The power rating fits well with the speakers information plate.
Next step is to order that device and the correct cap and take it from there. Looks like the components will be around £7.00 but the handling/carriage will be £12.00
, however this would be a small price to pay considering the speaker is around £490 retail.
I would like to take this opportunity to thank all the forum members who tried to help me, I really do appreciate it. As a first post in this type of forum I also learnt a lot about what information is expected from me when making a cry for help and hopefully it will help me improve in the future. It also helped me think outside the box too.
Hopefully this is where my journey ends for this particular repair so I will mark the topic solved as my original aim has been achieved. If things don't work out after fitting the new components then I'll return with a new topic
Thanks again all