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While manufacturing test helps to isolate faulty devices from the good ones, diagnosis is enabling a faster transition from the yield learning to the volume production phase of a new process technology. Given the escalating design complexity, new methods such as embedded deterministic test have been proposed in recent years to deal with the cost of manufacturing test. This paper discusses diagnosis of logic blocks by leveraging the existing embedded deterministic test hardware. The proposed method is based on new techniques for on-chip decompression and comparison of incompletely specified test patterns and test responses. Using experimental data, the tradeoffs between the number of tester channels, on-chip area, and scan time are discussed.