crt显示器消磁继电器不断吸合（CRT display degaussing relay continuously attract）.docVIP

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crt显示器消磁继电器不断吸合（CRT display degaussing relay continuously attract）.doc

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crt显示器消磁继电器不断吸合（CRT display degaussing relay continuously attract）

crt显示器消磁继电器不断吸合（CRT display degaussing relay continuously attract） Samsung 788DF, 763MB, 765MB and other models of the display, there is a common fault is CPU, intermittent work relay flip-flop. The failure of machine CPU pin has a AFC SENS signal, normal working voltage of this end to about 5V, what is more likely to be determined by the internal data (guess), but the signal from the output transformer, so this will involve a series of problems, when the working conditions of line output an abnormal will occur when the signal is not normal, I have tried to remove the board when the plug, remove the two power, do not plug deflection will cause CPU intermittent work relay flip-flop. What is the reason for it, and later through the efforts of circuit found that as long as the CPU voltage AFC at the moment of starting up to 5V will protect work. Since the problem has been discovered, how to solve the problem has become a new subject. After a morning study, we have finally found a solution, as follows: 1, with a 4 thousand and 700 ohm resistor connected to the +5V and CPU AFC feet 2, disconnect the two power supply (remember to prevent the two power supply is not normal, cause unnecessary loss), 3, you can begin to check as you please. 4, after the removal of the resistance to add, after all, this design has its advantages. We also found a problem that the original drawings of the R531 resistance is 56 thousand ohms, and the actual application of 82 thousand in Europe, built a case of people sentenced to death of the machine, check the components basically intact, the resistance change and repair for 56 thousand euro. It is estimated that the difference between the parameters of the components such as the feed pipe and the original machine element causes the AFC voltage to be low. SONY KV-F29MFlJ three repeatedly pull fficeffice / degaussing relay After starting, no grating, no image, no sound, degaussing relay repeatedly attract. The fault may occur in the I2C bus con