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Hello    -  pretty simple  -  the   C on the Vcc   charges up   -   then the flyback starts  -   but there is insufficient time for the 1000uF  output cap to charge ( hence not enough volts out of L3  )  before the cap on the control IC  discharges to the point the IC latches out,  then the cycle repeats  -  this is a classic newbie thing.


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