How to check the power supply of the TV

Advances in the production of modern household appliances are amazing. Now it is almost impossible to imagine a house in which there would be no TV and other technical devices. But over time, the operation of any equipment may fail. One of the most important parts of the TV is the power supply, which is a complex design. It is from him that good quality of sound, image and normal functioning as a whole depend. Possible problems with this element of the TV receiver are difficult to solve and it is not always possible to fix them yourself. You can contact the technical support center or repair everything under warranty. But some people prefer to figure it out on their own.

The device and principle of operation of the TV power supply

Before proceeding with troubleshooting a power supply, it is necessary to understand its internal structure and the principle of operation. By itself, this element is a complex mechanism that regulates the current supply and corrects the voltage throughout the entire appliance. It is thanks to him that normal power consumption and the operation of the TV as a whole are ensured.

Nowadays, manufacturers are considering various options for completing a switching power supply. This is done in order to ensure safety and reliable transmission of electric current, even in conditions of extreme voltage drops. But often this does not justify itself, and the addition of additional parts not only does not make the design more reliable, but also creates additional weaknesses, and also complicates the repair of the equipment. Therefore, it is best to use simple devices that are easier to work with. And it is advisable to have a wiring diagram with you, with which you can understand the possible sources of the problem.

The main parts of the power supply:

• input voltage reduction and rectification system, consisting of a different number of windings depending on the power of the current source;
• special filter capacitor, smoothing the differences between direct and input current;
• output voltage stabilization system, which includes a special chip.

Based on the components that come with the standard power supply, you can understand the principle of its operation, which consists of several successive stages:

1. The input voltage coming from an external source is aligned to acceptable values ​​for a particular appliance.
2. Then, signals are generated, the approximate frequency of which varies between 10-100 kHz.
3. Change the pulse frequency to the required values.
4. After that, the voltage already received is equalized and filtered directly inside the UPS.

After carefully studying the basic elements and understanding the principle of operation of the device, you can begin to search for problems and fix them.

IMPORTANT! If there is any doubt about the possibility of repair, it is better to contact specialists for help, since there is a risk of damage to the unit.

Possible malfunctions of the TV power supply

A complex system of work and many components make it difficult to troubleshoot the power supply. This is easier to do if you have an idea of ​​the principle of operation of such devices. It is also useful to use the circuitry used in the instrument.

If you do not have it at hand, you can use the general plan for inspection and problem detection. The most common causes of failure are the following options:

• blown fuse;
• there was a power failure due to overheating or mechanical damage to the chips;
• the current supply is interrupted due to the operation of the safety system;
• the main transistor in the device burned out;
• voltage in the circuit exceeds the limits of permissible values;
• There was a breakdown of any of the components of the appliance.

IMPORTANT! The main negative factor leading to breakdown is overheating - due to high temperatures and violation of operating modes.

How to check the power supply

In order to correctly carry out a check in order to contact a service center or repair it yourself, you must perform the following algorithm of actions:

1. Unplug the TV.
2. Discharge the capacitor located in the housing.
3. After that, carefully remove the board from the TV.
4. Inspect it and look externally for possible defects.
5. Using a multimeter, check the health of all components of the electrical circuit.
6. You should also carefully examine the back surface of the board.

If, during an external examination, obvious signs of damage were noticed, it is likely to eliminate the cause by simply replacing the components with new ones.

More complex manipulations will require special skills, so it is best to contact a specialist who knows this. Further work will consist of a special and high-precision voltage test throughout the circuit. This is associated with a risk to life and health, therefore it will be safer and more reliable to entrust the equipment to the master.