Explosive Failure Of A Maxx AC Adapter Model 1250
This adaptor belonged to the hospital where I worked and was brought to me with the complaint that a loud sound was heard and it became dead. On opening, I was taken aback to see the charred components:
The fuse was blown and the Mosfet had burst and I gathered the number as TOP227Y from my techie friends. The tank capacitor had burst on the top and all the electrolyte got spilled all over inside. It took repeated efforts using IPA and brushes to clean the area thoroughly, as the chemical was conductive.
After ensuring that the board was clean enough and checking the components in the primary and secondary, I replaced the tank capacitor and connected a module to check whether the output was ok.
Since the result was good and it proved that the primary and secondary was ok in the circuit, I replaced rest of the capacitors, retouched the board very well and cleaned it thoroughly.
I also replaced TL431 and opto as a precaution.
Then soldered the Mosfet and its heat zinc as how it was before and checked the DC output and wave form. It was working swell and here is the picture:
Closed the ACA and kept it ready for me to carry it back to the hospital. Mission successfully accomplished adding great satisfaction to its collection.
Very proud to mention that this is my 400th article, which could not have been possible without the support and benevolence of Mr.Jestine Yong and the continued support given by the readers! Many, many thanks to all of you and also to God for making it possible!
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You may check on his previous article on Restored An F&D USB Video Player AC Adapter Model F100