How to repair the poor filter of the TV?????

You can be clear. If you want to shoot it, this proves that the motherboard of the TV has open soldering, which is the result of virtual soldering, and it may be a component in the field circuit. Another situation is that you said that tilting the TV is not faulty, which may be the correction of the TV by the geomagnetic field, and the tilt changes the position of the geomagnetic field to change the fault, which is not very willing but doubtful.

Your TV is not badly filtered, it's poorly contacted. That is, if there is a line that will not be broken or there is a component virtual welding, it needs to be carefully inspected to find out that the fault spot is welded, and the main position is the components with larger volume and larger passing current. The key points are the power section, the line, the field scan section.

The owner's TV display content is often only half, and it is accompanied by flickering and jumping, which is the failure of the field scanning circuit;

This kind of fault is generally not a virtual weld, but a problem with the "semi-variable potentiometer", and the loose midpoint leads to poor contact;

The potentiometer can be replaced, and the parts are **1 yuan, and it takes 30 yuan to send it for repair.

It's not bad filtering.

It is the component foot solder joint on the circuit board that has cracked.

You solder the solder joints of the components in the upper circuit part of the TV circuit board.

If you have time, you can solder the power tubes and power-hungry components.

Guaranteed OK

The fault phenomenon is obvious, that is, virtual welding. Please ask the maintenance personnel to repair the weld field circuit.

There is a high possibility of virtual welding!

Flash is a case of poor contact, it is estimated that it is the field part, and it is good to solder.

The main reasons are: 1. If the filter screen is bad, the TV monitor will sometimes open normally, sometimes it is a full screen with vertical color bars, sometimes it is a gray screen, sometimes it is a black screen with about one-third of the bright and irregular edges, and the screen display is unstable and abnormal. 2. The 300V filter capacitor of the TV is broken, the image will have a large ripple of Peixinjian, the edges will be distorted into an S shape, and the sound accompanied by the pants will have a great communication sound.

Suggested workaround:

1. Electric shock method, when the measured resistance between the legs of the filter is lower than 1, it is seriously energized and can be repaired by the introduction method. Take a 33UF 400V capacitor and connect it to the 110DVC power supply of the TV to charge. When it's fully charged, remove it and then touch the two pins of the filter with the two pins of the capacitor, which actually shakes the filter.

This can be repeated several times until the resistance between the two pins of the filter is greater than 10m. Most of the filters repaired with this method can be used continuously.

2. Blocking method, when there is electricity between the input and output terminals of the filter, a ceramic chip capacitor C of the tens of picos method can be connected in series at one end, which can not only overcome the leakage fault, but also continue to use its filtering characteristics.

3. Knock on the door, due to the collision of the filter caused by poor internal contact, the radio or TV works normally, but not normally. This type of malfunction can be fixed by gently tapping the filter, and when the internal contact is good, it can be fixed by heating and pouring paraffin or rosin. This practice often works in practice.