Power up after startup, observe the ammeter, standby for more than a dozen current ma. Normal. Suspect the power module might be empty welding, but with a heat gun to failed after welding. According to the principle of the circuit, the machine shutdown circuit consist of U100 and Q100 (see figure 2). After remove the Q100, found that mobile phones are no longer automatically shutdown, Q] 0 () leakage. After replacing Q100, troubleshooting.QV3service manual download site