In the morning, I received a LG21-inch color TV. The owner said that I saw a smell of burnt smell last night. Then there was smoke coming out. I found that the two resistors connected in series on the ABL circuit burned black. It is over-voltage detection, resistance burnt must have a local short circuit, and later found Q301 damage, these two resistors refer to Samsung's one movement for 22k, 51k resistance. Check the machine without obvious bad parts, the screen is bright, the image of the AV signal is a little gray, the brightness and contrast are adjusted to the maximum or no layering, the color is not bright enough, and the brightness of the accelerating voltage is not obvious. The three cathode voltages are normal. Is there a fault in the ABL circuit? If you look at the results again, isn't the 8880 block broken? The accelerating brightness is not too bright but there is a retrace line. Is the CRT aging? Reluctantly measure the voltage of the tailgate, and find that the filament voltage is only about 2.8V AC. See the surface of the current limiting resistor yellow, and remove the measurement from 1 watt 1 ohm to nearly 10 ohm. Switch back to the 1 ohm resistor screen and now the brighter grating, adjust the acceleration voltage to moderate, and connect the signal with clear and vivid image. The repair is over, a current limiting resistor, a messy, dizzy brain swelling for nearly two hours.
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