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正向电压不正常

困扰了我三个月了, 焊了很多块板子,

问题:正向电压6.2V(预期5.85V)

板子情况:输入4.4V,负向电压5.6V正常,参考电压1.2V正常,  正向FBP偏高1.27V(正常的板子1.21-1.22)

初步分析:硬件正确,FBP偏高,FBP到正向电压输出端  一路电压有50ms的锯齿波,正常的没有, 电感和三极管一侧没有锯齿波。

请大神给点思路,实在伤脑子