There are several parts that are going to be check like the ff:
1. Glass fuse - Some unit replacing the fuse alone fix the problem.
2. Stepdown transformer - if it has then check for open/shorted winding.
3. Regulator I.C.
4. Fusible resistor.
All parts are on the power supply section.
1 & 2 can be DIY but 3 & 4 are needed to do by the techinician.
If you replaced the fuse and blew again then you have a shorted parts. However if it has no reaction then you might have an open parts.
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