Z11 hashboard is short-circuited to ground at 3.3V. After removing the IC (U3), inductor (L1) and capacitors (20, 22, 23, 24), the short circuit issue persists.



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Check the LDO circuit. Remove C21,C13,U3 to verify. If the issue still exist, the power IC broken, test the power manage IC one by one.
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