SOURCE: thomson tv model 25DK91XD power supplay smps
SMPS circuit consist of the same block diagram and all what is need for you is to trace from the main AC to DC conversion- the rectification , then the DC power applied to the switching/chopper device through the SM transformer.
Now check the pulse generation, if the IC is producing to start off the switching pulse. If not the IC can be defective. If there was a burn out the corresponding circuits must be changed totally as damage could have occurred. Also the SM transformer is a suspect., the current detector opto -coupler is also a common failure.
Please find some tips from the following link: SMPS
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