Home TVs have a variety of problems for a long time, but the most common is that there is no image on the TV after power on. In this case, many people do not know what caused the cause, do not know whether to buy a new one or take it for repair. On the other hand, in the maintenance of televisions, what should we pay attention to? Below, just go with Xiaobian to find out.
Reason one:
There is no sound in the television, but the setting menu of the TV can be displayed on the TV. The problem with the TV may be that there is a problem in the separation of audio from sound to video playback.
Solution:
We first tested the sound separation section first. There was a problem with the separation of the sound. Please ask a professional to come to the door to repair. Do it yourself. Improper operation will cause your TV to not only have no picture, but also sound. Will disappear.
Reason two:
Check whether there is high-pressure sound when the TV is turned on, and high-voltage sound appears on the TV. This shows that the circuit work of the TV is basically normal. Without high-voltage sound, the circuit of the TV may not be activated.
Solution:
The television circuit did not start using the human body induction signal injection method first, and observed whether a bright line on the level had a beating or a phenomenon of widening. Such a phenomenon would indicate that the work of the circuit output was normal and the fault appeared in the field vibration. And the field output signal is transmitted on the circuit.
Reason three:
Check the phenomenon of the TV lamp is not light, the phenomenon of lamp light, slowly adjust the screen rotation while watching the screen, the screen will appear three kinds of conditions: 1, the screen does not change, this shows that the phenomenon of lamp grid cathode voltage abnormal 2, horizontal one line, in this case in addition to the field deflection coil open circuit or solder joints and welding joints outside the virtual solder joint field welding and field transmission signal will also cause failure. 3. A vertical bright line is the open circuit of the deflection yoke and the phenomenon of the joint welding.
Solution:
If the voltage of the display tube is abnormal, first check whether the 200V power supply is abnormal. If the power supply voltage is abnormal, you need to purchase a voltage regulator. Welds on the line must be re-welded to the place where the line was cold-welded, and the open circuit conditions should be adjusted.
Reason one:
There is no sound in the television, but the setting menu of the TV can be displayed on the TV. The problem with the TV may be that there is a problem in the separation of audio from sound to video playback.
Solution:
We first tested the sound separation section first. There was a problem with the separation of the sound. Please ask a professional to come to the door to repair. Do it yourself. Improper operation will cause your TV to not only have no picture, but also sound. Will disappear.
Reason two:
Check whether there is high-pressure sound when the TV is turned on, and high-voltage sound appears on the TV. This shows that the circuit work of the TV is basically normal. Without high-voltage sound, the circuit of the TV may not be activated.
Solution:
The television circuit did not start using the human body induction signal injection method first, and observed whether a bright line on the level had a beating or a phenomenon of widening. Such a phenomenon would indicate that the work of the circuit output was normal and the fault appeared in the field vibration. And the field output signal is transmitted on the circuit.
Reason three:
Check the phenomenon of the TV lamp is not light, the phenomenon of lamp light, slowly adjust the screen rotation while watching the screen, the screen will appear three kinds of conditions: 1, the screen does not change, this shows that the phenomenon of lamp grid cathode voltage abnormal 2, horizontal one line, in this case in addition to the field deflection coil open circuit or solder joints and welding joints outside the virtual solder joint field welding and field transmission signal will also cause failure. 3. A vertical bright line is the open circuit of the deflection yoke and the phenomenon of the joint welding.
Solution:
If the voltage of the display tube is abnormal, first check whether the 200V power supply is abnormal. If the power supply voltage is abnormal, you need to purchase a voltage regulator. Welds on the line must be re-welded to the place where the line was cold-welded, and the open circuit conditions should be adjusted.
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