Abstract
Let E and E' be elliptic curves over Q with complex multiplication by the ring of integers of an imaginary quadratic field K and let Y = Kum (E × E') be the minimal desingularisation of the quotient of E × E' by the action of - 1 . We study the Brauer groups of such surfaces Y and use them to furnish new examples of transcendental Brauer-Manin obstructions to weak approximation.