Just repaired a Konka TV, the model is shown below. When the power is turned on, there is no response to the test, and there is no TV indicator. The quick release cover is first powered on and measured. The voltage across the power supply filter capacitor C910 is 310V; the voltage measured at +B is 0V, and it is judged that the power supply is partially faulty. Look at the power supply block for the TDA16846. The voltage of the 2 pin of the test IC comes back at around 13V, and then the 11 pin is 0V. After the power is turned off, the C910 is discharged, and the R902 resistance is measured to be infinite. Look at the resistance color code is 2.2M, replace it with the same type of resistor. After replacing the +B voltage with the bulb, the bulb will be on when the power is turned on, and the measured +B voltage is 125V normal.
After the power-off recovery circuit is turned on, the raster appears on the power-on, the AV signal line is turned on, and the AV state is turned, and the sound image is normal. It took ten minutes for the repair to end. The fee is green and black.
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