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Reasons for the automatic shutdown of the TV
The automatic shutdown of the TV is a common TV fault in our life. We often encounter such TV failures in some TVs that are used for a long time. Generally, the circuits that will be involved in the troubleshooting of the TV will include: line vibration and scanning, switching power supply, TV microprocessors, etc., which may cause the appearance of TV welding, over-current protection, etc. The poor thermal stability of a certain component of the TV. Here we mainly take a look at what causes the television automatically shut down.
One reason: Welds cause the TV to shut down automatically
Welded TV will cause the TV to turn off. The phenomenon of TV welding will appear when the TV is turned off without regularity. At the same time, the TV will turn on automatically after it is turned off. After the TV is turned off, the user pats the case and the TV is turned off. Boot it again.
Solution: When the phenomenon of false welding of the TV causes the TV to shut down automatically, during the maintenance process, the TV case needs to be disassembled, and the switching power supply of the TV and the solder joints at the line scan output circuit must be carefully checked. The focus is on larger components and higher temperature components. At the same time, it is also able to gently tap the circuit board that is more likely to fail to find the faulty component, so as to find out the virtual solder joint of the television.
Cause two: The X-ray protection circuit causes the automatic shut-down of the TV's X-ray protection circuit to cause the TV to automatically shut down. The phenomenon that occurs at this time is that the TV will quickly shut down after being turned on, and it is also prone to untimely shutdown.
Solution: At this time, when measuring the voltage of the X-ray protection leg, its voltage will generally be higher than 3V. This shows that the large external resistance of the TV is deteriorating, and the feet of this place can be short-circuited to ground directly during maintenance. 
Reason 3: Overvoltage protection When the TV has overvoltage protection, it will also cause the TV to automatically shut down. When the TV's power output voltage is higher than the set value, the overvoltage protection circuit will work, and the TV's switching power supply will stop working. The TV's switching power supply generates over-voltage protection when the output voltage rises due to a voltage increase. At the instant of turning on, we can hear that “zigs†is a sound, and then the TV stops working. The TV shutdown caused by this reason has a certain regularity.
Solution: TV overvoltage protection is caused by the high voltage of the switching power supply of the TV. Therefore, when the maintenance is performed, maintenance should be started from the problem of high power supply voltage.
Reason 4: Over current protection The reason for the automatic shutdown of the TV is that the TV has overcurrent protection. When the TV's current load circuit causes excessive current for some reason, the TV's overcurrent protection will work. Let the TV power circuit stop working. If the TV is lightly loaded, the TV will automatically turn off after a period of time.
Solution: TV over-current protection is in fact similar to TV-welding. In order to distinguish between TV-based automatic shutdown and over-current protection, it is only necessary to tap the TV circuit board to see the fault of the TV. Can not disappear to know in the end what is the factor that led to the TV automatically shut down.
Changhong TV frequently shut down how to do? Four aspects need to pay attention
For long-term users of smart TVs, the problem of automatically restarting the TV is often a problem. But what exactly caused the frequent automatic restart of Changhong TV? In fact, this may be due to four reasons: the virtual welding, X suspected of protection circuit, overvoltage protection and overcurrent protection. The following small series on the four points for everyone to explain in detail the solution.