Before replacing the switching output IC STR, you have to check all its associated components on board, especially low value resistors, and zener diodes. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
repair procedure of STR based power supplies, and circuit diagrams are given. Just type in the STR number in the search box at the right side to get gathered related posts.
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