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Identify part to Repair board

E

esinior

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Hi

I have a HUAWEI PAIA power supply and it has two smd parts that i couldn 't identify and find any datasheets for them. The first is marked "S1D30" or "S1C51" or "S1B07" (in different boards) with package SOT23-6 and the second is "N3868V" with SO-8 package ( i think it is similar to N3867V Synchronous Rectification Controller), i will upload pics of the board and parts

who can help me what are these parts?
 

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