TV power supply repair

Television, even with the development of technology, occupies a large place in human life. Modern wide-format models allow you to feel like you are in a movie theater without leaving your own walls and a soft sofa. It is TV that still remains the main source of news about what is happening in the world and the country. Therefore, any breakdown spoils the mood of its owner. A faulty power supply is a small problem, but the most common of all. A natural question arises: where to find a repairman and whether it is necessary to take the equipment to a service center. It’s easy to solve if a breakdown occurred and was noticed during the day, but finding a specialist at night is several times more difficult. You can try to fix the problem yourself, because this option is possible in some cases.

How does a PSU malfunction manifest itself?

Modern TVs are compact in assembly, making repairs much easier. It is usually immediately clear what has gone wrong with a visual inspection. But there are malfunctions that can only be determined using diagnostic equipment. You should not try to repair the motherboard yourself without the appropriate knowledge, this will only aggravate the breakdown.But figuring out the power supply and lighting is quite possible on your own.

The power supply can be external or integrated - and the first is typical for TVs with a small diagonal.

Characteristic features:

1. Doesn't turn on.
2. It turns on, but there is constant noise on the image, the sound is very loud.
3. The sound is present without the picture.
4. Normal operating mode is activated after several attempts to turn on and off.

These are typical problems associated with the power supply. But to be sure of this, you should make sure that the remote control and control panel on the TV itself are working. In addition, check the connection between the antenna and the receiver, pay attention to the weather - interference may occur due to external reasons. You should move on to power supply after excluding external problems.

Main causes of malfunctions

A power supply failure is a common cause, so in some cases you can fix it yourself. All possible solutions have already been given. But before that you need to know the reasons for the failure:

1. Unstable voltage. Component wear occurs due to constant voltage surges.
2. Short circuit - the power supply burns out. The wires will probably melt.
3. The mains fuse had blown, causing a subsequent problem with the power supply. Identified by an extinguished indicator.
4. Wear of capacitors due to frequent use.

Knowledge of these main factors will allow you to weigh the pros and cons of service. A number of problems can be easily solved on their own, while others will require the intervention of a specialist.

Analysis and determination of the problem

The power supply is often integrated into the design of the TV. You need to remove the back cover secured with screws. The next step depends on the specific TV model.If the block is not immediately visible, then the part is hidden behind a protective casing - you just need to unscrew more screws.

What does a power supply unit and its components look like?

The appearance of the power supply, located on the common board, is easy to distinguish from the rest. It is gray in color, looks like a square box, and is usually located on the edge of the power board. Capacitors and other components have a different shape. But they can easily be confused with transformers - they are also rectangular in shape, but painted yellow.

BP components:

1. Standby power supply (standby indicator is on, 5V voltage is consumed). In other words, if it is broken, the indicator on the TV panel will not light up.
2. Inverter - turns off the receiver immediately after turning it on. It is responsible for power supply, so if it breaks down it returns to standby mode.
3. Capacitors - the problem is identified by swelling.

These breakdowns can be eliminated using power factor correction. Usually this diagnosis is carried out at a service center, but in general you can try to do it at home. In addition, such malfunctions are easy to fix - you need to purchase the necessary part and replace it using a blowtorch.

IMPORTANT: Be sure to take a photo of the power board with you to make the right purchase. Despite the fact that the blocks are almost identical, you need to be careful with the characteristics of the new parts.

Repair of power supplies for LCD TVs

The design and operating principle of LCD TVs and conventional receivers are the same. Of course, there are distinctive features, but they do not affect the diagnosis of faults.Problems with the power supply cause complete equipment failure - the TV simply does not turn on or turns off involuntarily after a short period of operation.

Thus, the repair process for all power supplies (regardless of the receiver model) will be the same:

1. Remove the back cover, as well as the protective cover, if equipped.
2. The power board is located on the left side and the motherboard is on the right side.
3. First, the transformers are checked (there are 3 in total, they are painted yellow).
4. Next, the board is removed to remove the broken parts.

IMPORTANT. Be sure to discharge the capacitors before removing and replacing them.

5. Replace with new ones, observing polarity when installing.
6. Put the board in place and check the TV's functionality.

The same sequence is followed when replacing other parts on the power supply.

CRT TV - power supply repair

Repairing the power board of old TVs (Rubin, Horizon, outdated LG models, etc.) is done in the same way. First you need to check the power supply for functionality if the receiver does not turn on. It is enough to check with a regular light bulb with a power of 60W. If the voltage fluctuates up to 150V, then the CP filter capacitor has failed. It is necessary to lower the voltage to eliminate leaks and short circuits. Then check all the remaining parts - mainly diodes. Then perform reverse assembly.

IMPORTANT. Before diagnosing, be sure to turn off the output stage - connect a light bulb in its place.

It is quite possible that it will not be possible to repair a CRT TV - it is difficult to find parts on them. Therefore, if it breaks down, it is better to simply discard the old receiver and replace it with a new device.

With such simple manipulations, you can independently determine the cause of the malfunction of the TV receiver power supply. Experts do not recommend dealing with the problem yourself; repairs will not take much time and the cost will be low.