The TV can now be said to be a must-have home appliance. It is inevitable that the TV will malfunction during the use of the TV. The phenomenon that the TV is automatically turned off during the viewing process is more common. So what about the TV automatically shutting down ? The following decoration home decoration network Xiaobian will bring you the analysis of the reasons for the automatic shutdown of the TV, I hope to help everyone.
What should I do if the TV is automatically turned off?
The reason for the automatic shutdown of the TV 1. The automatic shutdown of the TV caused by the virtual welding: If the TV is automatically turned off due to the virtual welding, the shutdown time is irregular. Sometimes it will turn on automatically after the machine is stopped. Sometimes it is necessary to shoot the case by hand to start the machine. Once turned on, it is normal again. When there is a virtual soldering fault, open the TV cover and carefully check the solder joints of the switching power supply and the line scan output circuit, especially the bulky components and high temperature components, such as switching power supply transformers, line output transformers, and limited current limit resistors. , rectifier diodes, etc. You can also tap the board of the suspect component to find the faulty component, or when the fault occurs, measure the critical voltage value of the switching power supply or the line output circuit to find the solder joint.
TV automatic shutdown reason 2, overvoltage protection: If the TV switching power supply output voltage is higher than the set value, the overvoltage protection circuit will work, so that the switching power supply stops working. When the output voltage of the switching power supply rises and the overvoltage protection is generated, at the instant of starting, the high-voltage "sniff" sound can generally be heard, but then the work stops, and "three nos" appears. However, there are also some TV sets, because some components cause the output voltage to rise after the performance parameter changes after booting, and thus automatically shut down in the middle. Compared with the above-mentioned "instant soldering" fault, the time of such automatic shutdown has a certain regularity.
Causes of automatic shutdown of the TV 3. Overcurrent protection: When the current load circuit causes excessive current due to some reason, the overcurrent protection circuit will stop the power supply circuit. If it is slightly loaded, it may turn off automatically after a normal period of power-on. The fault phenomenon at this time is similar to “virtual weldingâ€, but the two can be distinguished by tapping the circuit board to see if the fault disappears.
Automatic shutdown of the TV 4, X-ray protection circuit caused automatic shutdown: the phenomenon of failure is to shut down quickly or not shut down after booting, at this time the voltage of the X-ray protection pin is higher than 3V, mostly for the resistance of external large resistance. The foot can be shorted to ground directly during maintenance.
The above is how the automatic shutdown of the TV brought to you by Xiaobian? I think that everyone has a basic understanding of the automatic shutdown of the TV after reading this article. If you want to know more about decoration consultation, please click to enter the decoration knowledge channel.
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