First of all, it is necessary to distinguish whether the TV set has sound without image or sound without light. The two are different in nature, and the solutions are of course different. The failure of TV with sound and no image is generally caused by the failure of picture tube. Please ask the maintenance master for the specific failure problem. If the TV has sound and light, basically the problem of the internal parts of the TV is not particularly serious, basically because of the setting of the TV or the poor contact of the connecting cable.

1. If there is no sound or image on the TV, there is probably something wrong with the circuit. It is best to ask a professional master to come to the house for maintenance as soon as possible, and leave the professional affairs to a professional technician.

2. If the TV is turned on for a period of time, the image gradually becomes blurred until it disappears, or the image gradually becomes blurred and returns to normal. It may be a fault in the computer control part of the TV set. If it is an old TV set, it may be a problem with the power amplifier circuit.

When the TV is turned on, there is no image. Many people want to pat it. We often use this method when we were very young, because the circuit of old TV sets generally adopts welding technology, and the imaging method is kinescope, which will lead to poor contact. Just take a few shots. However, this method is not suitable for modern LCD TVs, and maintenance personnel need to go to the door for further inspection.

Snowflakes appear on TV, which may be caused by the internal circuit of TV, but it may also be caused by TV signals. If the color of the TV screen is red and green, if it is a big screen TV, it is mostly a picture tube failure; Small screen color TV is mostly a problem of color video and amplification circuit.

In a word, if there is something wrong with TV, it is better to let professionals answer your questions instead of thinking for themselves. I can't understand the structure and circuit diagram of the TV set, let alone start. Not all problems can be solved by themselves, at least not technical problems.