[3-methyl-2-oxobutanoate dehydrogenase (lipoamide)]-phosphatase activity
[3-methyl-2-oxobutanoate dehydrogenase (lipoamide)]-phosphatase activity
Catalysis of the reaction: H2O + O-phospho-L-seryl-[3-methyl-2-oxobutanoate dehydrogenase] = L-seryl-[3-methyl-2-oxobutanoate dehydrogenase] + phosphate.