Haier color TV 29FK1 indicator flashing no light silent maintenance example - appliance repair - Huaqiang Electronic Network

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Brand model: Haier color TV 29FK1
Symptom: The indicator light flashes, no light and no sound.
Overhaul process: detect short circuit, disconnect the line pipe, line package, line pipe short circuit, the line pipe has been replaced by the former repairer. Disconnect the line load test B + voltage power supply is normal, the line package has no obvious short circuit, the reverse process capacitor, the correction capacitor is normal, the line test machine is replaced, the start line is started, and the line tube is broken again in an instant. There is no problem in checking the incentives, and the line test machine is replaced again, and the power is turned on or instantaneously broken down. Check the deflection - no problem. Judging the bad package, replacing the line package, test machine, there is high voltage, there are characters. Adjusting acceleration, focusing, can not be adjusted normally, acceleration voltage instability is high and low, just like the acceleration pole adjustment potentiometer is not normal. I suspect that the package is not normal! However, there should be no problem with the new line package. Check that the ABL voltage is not 0. When adjusting the acceleration potentiometer, it is found that the ABL resistor smokes, replace the ABL resistor R640 (1K), and the VD641 has been broken down along the way. Replace the VD641--1N4148, the test machine re-adjusts the acceleration, the focus grating is normal, and the color TV is successfully repaired.