Color-missing maintenance of TV set

The phenomenon that the vibration may be restored due to the lack of blue, which you mentioned, is generally that there is virtual welding on the relevant components of the tricolor video amplifier tube or the tail plate of the tube, and the corresponding repair welding can be solved, especially in the video amplifier tube which is prone to heat. In addition, the filament contact electrode is used to supply power to the filament by threading from the magnetic core of the high-voltage package. The filament must be completely separated from the original circuit. Only in this way can the power supply of the filament be suspended, that is, the CRT filament (the third and fourth pins) is separated from the original circuit, and one end of the winding led out from the magnetic core of the high-voltage package is connected with it (pay attention to measuring the voltage formed by it, and the peak-to-peak value between 20 and 24 volts can be observed when an oscilloscope is available, and the range of 10V can also be judged by comparing with the data on the normal machine. For example, the MF47 meter and stylus are about 4.7V and 5. 1V respectively after switching. If the voltage of two coils is low, you can add one coil and then adjust the resistance of 1 w between1and 4.7 ohms in series. )