For the Sony KV-ES34M9S TV, after turning on, there is no raster on the screen, only a horizontal bright line.
Analysis and Maintenance: Based on the fault symptoms, the field scanning circuit should be the focus of inspection. First, check the forward and reverse resistance values of pins 1 and 7 of the STV9379, then detect the asymmetrical resistance value of pin 19 of the input plug CN6800 to ground, suspecting a fault in the input circuit of the STV9379. Disconnect the power supply circuits of pins 2 and 6 of the STV9379, and detect that the forward and reverse resistance values of pins 2 and 6 to pin 5 are also asymmetrical, concluding that one end of the internal output stage of the STV9397 is open or broken down.
Repair Method: After replacing the STV9397 with the same model, the fault was eliminated.
Content Source: http://blog.sina.com.cn/sonydianshi