Check the main plug point care fully for any shorts, on - off switch , The main reason for this is bad bridge rectifier. Check all the diodes for shorts. If any one one is damaged please replace all the four diodes. In some P/S (Power supply) an IC is used for rectification. Where 2 pins for AC input and 2 pins for DC output.Also check for variactor. Its shape is similar to the pf capacitor having blue color.
Also check for the PTC with is connected to degaussing coil.also some time shorted line filter will cause this problem. As you know you need to check switching transistor or STR may be faulty.
After repalcing faulty item donot switch on the PS directly. Use the bulb as series connection.
(To understand this process please refer my previous postings). At any cost do not replace fuse with wire.
Also before doing any cold test to PS please discharge main filter.
(To understand this process please refer my previous postings).
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