The TV always turns off automatically, and the TV always shuts down automatically

For a TV set that has been around for a long time, the internal circuit will be soldered, or there will be a situation such as soft breakdown of a certain device aging. The existence of these conditions will make the power supply circuit appear automatic shutdown protection.

After the TV with or without signal automatic shutdown function is aging for a long time, the image may be out of tune, and the CPU cannot detect the image signal, and it will automatically shut down after five minutes. This is basically the reason why your machine will automatically shut down after five minutes. In this case, the image quality will also be significantly reduced.

You can change the middle week, the element ** is not expensive, one or two yuan, but it must be adjusted appropriately. Ask a professional to overhaul it.

The switching power supply (also called pump power supply) of the color TV is equipped with a fault automatic protection shutdown function! When there is a fault somewhere in the circuit (the component is damaged), the switch can be quickly turned off! So as not to expand the malfunction!

Being able to stop and open itself means that there is a poor contact somewhere in the circuit or a soft breakdown of a certain component! You'd better not turn it on again! Let's open it after sending it for repair!

Otherwise, when it crashes completely, the loss will be great!

There is no regular automatic shutdown, very depressed... I hope the master can help solve the switching power supply (also called pump power supply) of color TV, with fault automatic protection shutdown function! When there is a fault somewhere in the circuit (damaged component).

The power supply in the machine is automatically protected.

First, check whether there is a short circuit or other fault in the power supply circuit in the machine.

The reason why the TV is always automatically turned off and how to deal with it:

1. Check whether the switch circuit of the TV is soldered, resulting in poor contact and frequent automatic opening and shutting down.

2. Check whether the switch circuit of the TV is damp, resulting in unstable contact and frequent automatic turning on and off.

3. Check whether the high voltage of the motherboard circuit of the TV is unstable, resulting in frequent automatic turning on and off.

4. The TV automatically shuts down and turns on again, which is generally a problem caused by the hardware failure of the TV, and it is recommended to contact the after-sales service of the TV for testing and warranty.

You first see if you set the automatic power on/off, otherwise!! Such a serious problem is, of course, to find after-sales.

Don't solve it yourself, otherwise it will leave an excuse for the merchant!!

Hit ** to go to the after-sales consultation to see.

The general causes and solutions for automatic shutdown of the TV are:

1. The internal circuit of the TV is automatically shut down due to virtual welding; Generally, it is necessary to check the solder joints at the switching power supply and line scan output circuit of the TV, and you can focus on checking the components with larger volume and higher temperature; After finding the virtual solder joint of the TV, you can re-solder it with an electric soldering iron.

2. The X-ray protection circuit of the TV is faulty, resulting in the automatic shutdown of the TV; The voltage of the X-ray protective pin is measured, and if there is an abnormality, it is judged to be a fault and needs to be replaced.

3. The TV will automatically shut down due to overvoltage protection; When the output voltage of the TV's power supply is higher than the set value, the overvoltage protection circuit will work, and the switching power supply of the TV will stop working, resulting in automatic shutdown.

4. The TV has overcurrent protectionWhen the current load circuit of the TV is too current for some reason, the overcurrent protection of the TV will work, so that the power supply circuit of the TV will stop working and the power supply circuit will automatically shut down.

5. Generally, the automatic shutdown is caused by the hardware failure of the TVNon-professionals are advised to contact the after-sales service of the TV for maintenance.

TV signal. The sequential sampling, transmission, and reproduction of TV signals from point to surface is done by scanning. The TV scanning system varies from country to country, but in China it is 25 frames per second and 625 lines per frame. Each line is scanned from left to right, and each frame is scanned in two fields from top to bottom in odd lines and even lines to reduce the feeling of flicker.

During the scanning process, the image information is transmitted, and the counter-scan line before the scanning electron beam returns from the end of the previous line to the starting point of the next line, and the field counter-scan line that returns to the top after each field is swept from top to bottom. A line-field synchronization signal is transmitted during line-field blanking to synchronize the received and received scans to accurately reproduce the original image.

Reason 1: The TV is automatically shut down due to the virtual welding of the TV, the reason for this failure is that the TV is not regular in the time of turning on and off, and the accompanying phenomena also include the automatic start-up of the TV after the shutdown; Reason 2: When the power output voltage of the TV is too high, in order to protect the circuit, the TV will be overvoltage protected, which will also cause the TV to automatically shut down; Reason three:

If the current load circuit of the TV is too current due to some reason, the overcurrent protection of the TV will start to work, causing the power supply to stop working, causing the TV to automatically shut down. The reason why the TV is always automatically shut down and the solution:1、The virtual welding of the TV will cause the TV to often turn off automatically,The phenomenon of the virtual welding of the TV is that the TV is turned on and off regularly,At the same time, after the shutdown,Everyone patted the case with their hands,The TV is turned on again。

When the phenomenon of virtual soldering occurs in the TV, it is generally possible to focus on checking the larger components and the higher temperature components. At the same time, it can also gently tap the circuit board that is more prone to failure, find the faulty components, and repair them. 2. When the TV is overvoltage protected, it will also cause the TV to shut down automatically.

When the output voltage of the TV power supply is too high, the overvoltage protection circuit will take effect, and the switching power supply of the TV will stop working, and then the TV will stop working. There is a certain regularity in the TV shutdown caused by this reason, and you can observe it. If the TV is automatically turned off due to overvoltage protection, it can be repaired for the problem of excessive voltage.

3. The reason for the automatic shutdown of the TV is that the TV has overcurrent protection, when the current of the TV is too large, the overcurrent protection of the TV will start to work, so that the power supply circuit of the TV will automatically stop working, that is, the TV will automatically shut down. The specific results can be checked and repaired by professional maintenance personnel.

The solution for the automatic restart of the Xiaomi TV is as follows:1. If it is automatically restarted when using the installed third-party software, it is recommended to uninstall the third-party software that installs the pants, and then observe the running status of the device.

2、It may be a late question about the system version,Enter the system settings of Xiaomi TV System update,Detect the system version,And upgrade the system of Xiaomi TV to the latest version。

3、If the system is already the latest version,It may be that there is a problem with some settings of the system,It is recommended to enter recovery mode:First of all, unplug the power plug of the TV directly,After waiting for a few minutes, press and hold the home button and menu key of the remote control at the same time,At this time, you also need to insert the TV power plug (the button cannot be released),You can enter the recovery interface and choose to clear all data。