The picture on the TV flickers

It happens that the image on the TV twitches, completely interfering with the correct perception of the frames displayed on the screen. There may be several reasons why this occurs, and in this article we will look at the most common of them, and also suggest solutions.

3 main reasons why the picture on the TV flickers

No. 1 The problem is in the frame scanning unit and the way to resolve it.

The frame scanner is one of the most important parts of televisions, both old and newer models. We begin the inspection with a thorough inspection of all parts of the block.

Important! When inspecting the microcircuit, make sure that there are no burnt parts or burnt holes on it.

1. Take a close look at the noise-suppressing capacitors, which, when they fail, swell slightly and increase in size. If everything is fine with their microcircuits, then look at the power circuits.
2. Checking the power supply buses of radio-electronic components for operability involves using a tester that determines whether or not current is flowing to all direct parts of the television power supply.
3. If the tester does not pay attention to the “power supply buses for radio-electronic components”, it is necessary to check whether there are breaks in them.To do this, you will need to check each section of the chain separately. For example, if the circuit track is really damaged, you need to check the damaged part of the circuit and correct it with a soldering iron. But if the circuit resistance has burned out, then it simply needs to be replaced with a new one.
4. Checking the vertical scan must begin with measuring the electrical voltage, which is taken from the winding coil of the line transformer.
5. First of all, you should check the functionality of the resistor through which power is supplied. Although, before this, it is worth considering that the so-called frame rectifier can often fail. Also, the frame scan itself may fail.

Less often, of course, the problem that leads to “jerking of the image on the TV” is personnel deflection coils. Moreover, if this happens, then these coils will need to be replaced - there are simply no other solutions.

No. 2 The problem is in the line scan unit and solutions.

When the line scan becomes unusable, the television kinescope stops receiving normalized electrical voltage. It is quite easy to verify this, even without special skills in this matter: if you bring your hand to the screen, the hair on it will stand on end. If this does not happen, then diagnostics will be required.

Another equally important reason that the unit responsible for displaying the image does not work is damaged circuits that shut down the urgent system. They appear due to poor contact, poor soldering of contacts. Sometimes the fault of all this is due to the malfunction of radio components.

No. 3 The problem of “image shake” due to the power supply.

The power supply, or “BP” for short, is used as a device for supplying electrical voltage to all parts and microcircuits of the TV. Before starting any work with the power supply, you need to disconnect the equipment from the network and discharge the noise suppression capacitor.

1. The first step is to check the power supply for breaks: the mains filter, the rectifier and the PWB modulator.
2. Let's start with the fact that the noise-suppressing capacitor must have a stable electrical voltage within three hundred watts. If it is missing, you need to check whether there are any breaks in the network filter.
3. If there is a rated voltage of three hundred watts or more on the noise suppression capacitor, you will need to check the permeability of the rated voltage to the key parts of the power supply transistor.
4. After checking the voltage, you need to start checking the primary winding of the power transistor for an open circuit.

If all of the above elemental parts are in good working order, but the power supply still does not turn on, then you will need to check the flow of pulse current to the gate element of the television transistor. It is also necessary to check the trigger circuits, usually they are resistors with high resistance.

Other reasons why the image on the TV screen may rattle

There are also factors that may cause the TV screen to flicker. For example, the antenna or a faulty socket for connecting the antenna cable may be to blame.

Checking this is quite simple, you just need to connect the TV to your personal computer via an HDMI cable and turn it on, checking to see if there are any ripples on the screen. You can also connect your TV to DVD or VIDEO set-top boxes.If, after checking, everything is in order with the picture and nothing blinks or ripples, then the problem is not in the technology.