Based on your description, we can limit the fault to the power supply board and in particular to possibly 3~4 components:
- bridge diode;
- filter capacitor (mains);
- filter capacitor (secondary).
blown fuse indicate a short in any of these.
has suggested, in the absence of a readily available replacement board, component level might be the best alternative at the moment. Having posted the most likely culprits further narrows down your troubleshooting. Could you pls post back the part number of the smaller IC either 4 or 8 pins?
Alternately, pls check for the presence of a VDR, it would look like a coin (often green in color or something else) with 2 pins. They have been known to short out also and cause fuse to blow. One possible indicator is chipped or flaked of one side or a hairline crack on top. If it is chip, there would be a silvery color on the inside.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
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