A method and apparatus for detecting a circuit malfunction. The method includes: receiving a detection instruction and controlling a plurality of equalization modules to be turned off in response to the detection instruction; collecting first sampled data of sampled equalization modules; controlling odd numbered equalization modules among the sampled equalization modules to be turned on and even numbered equalization modules among the sampled equalization modules to be turned off; collecting second sampled data of the sampled equalization modules; controlling the odd numbered equalization modules among the sampled equalization modules to be turned off and the even numbered equalization modules among the sampled equalization modules to be turned on; collecting third sampled data of the sampled equalization modules: and determining, according to the first sampled data, second sampled data and third sampled data, a malfunction in a sampling detection circuit and locating the malfunction.