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At this point...I would re-check ALL diodes and any transistors near that IC..on th HOT side of it (within that white drawn area surrounding HALF of the transformer and optocoupler.) be SURE to check any diodes and make sure none are shorted.
If you do NOT find anthing...that i would order than IC and the optocoupler--as a "just in case". Your voltages indicate the IC is NOT shorted and is getting full voltage from the big cap and it ALSO looks to be geting its "start voltage" too. I would gues it is just bad.
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