What are probable causes of a tvs transformer to short out?

my flat screen smokes and sparks from the transformer when we try to turn it on. that's on the main board with one bulging capacitor i'd like to change this main power supply board but i don't know what the root problem is. could the problem be something other then the main board? what's causing the... show more my flat screen smokes and sparks from the transformer when we try to turn it on. that's on the main board with one bulging capacitor i'd like to change this main power supply board but i don't know what the root problem is. could the problem be something other then the main board? what's causing the transformer to burn up?
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