Turn on your digital TV Why is the blue screen and it shows no signal!

The main reasons are: 1. The signal of the TV and the set-top box is inconsistent. 2. The TV set-top box is not turned on or the display screen is broken. 3. Caused by abnormal circuit of the TV set-top box.

4. There is a problem with the connection cable between the set-top box and the TV. Suggested processing method:1、There is no signal on the blue screen of the TV,It may be because the network signal source is inconsistent,Find the place where the TV sets the signal to connect to the network,Adjust the network connection,Adjust it to be consistent with the signal source of the set-top box。

2、There is no signal on the TV blue screen display,It may be because the set-top box is not opened,You only need to open the set-top box,Maybe there is a signal input,If there is no signal input,You can consider that the display module of the TV is broken,Or the display screen driver has a virtual welding。 3. The circuit of the set-top box is abnormal, which will also cause no signal on the blue screen display of the TV, or there is a problem with the output line of the set-top box, and the circuit of the set-top box needs to be detected, or the set-top box will be returned to the factory for maintenance. 4、There is no signal on the TV blue screen,It may be that there is a problem with the cable port of the set-top box,It is necessary to repair or replace the port of the set-top box,It may also be that there is a problem with the connection line port of the TV,Need to repair or replace the TV port,If there is no problem with the ports on both sides,Then,It is necessary to suspect that there is a problem with the connection cable in the middle,Replace the connection cable and try again。

Causing the TV to appear on the blue screen,The failure of the signal will be caused by the delay in the CPU signal recognition circuit of the TV,If the delay is not long,You can leave it alone。 If it takes a long time for a signal to appear on the blue screen, it means that the signal recognition circuit of the TV is faulty. How is it a bus TV, this fault may also be related to the bus data error or the high frequency head.

The solution is:You can turn off the blue screen function of the TV first,Use the power on to receive the signal for the snowflake state to try。 If there is still a significant signal delay, you can only ask a professional to repair it.

Daily maintenance of TV series.

If the TV is not used properly, it will affect the life of the TV.

1. Pay attention to the influence of geomagnetism. The phosphor screen of the large-screen color TV should be placed facing south or north, so that the direction of the earth's magnetic field is consistent with the direction of the electron beam in the picture tube, so as to prevent the geomagnetism from affecting the color purity.

2. Pay attention to ventilation and heat dissipation. When using a large-screen color TV, do not cover it with plastic sheeting, cloth covers, etc., and do not pad foam plastic at the bottom, so as not to affect the ventilation and heat dissipation of the color TV.

3. Pay attention to color and volume. The color, volume, and contrast of large-screen color TVs should be appropriate, so that not only the best effect is good, but also power saving, and it can also extend the life of the TV.

1.See if there is a sound; There is a sound indicating that the TV signal is fine, check whether it is improperly adjusted or the TV is faulty. The absence of sound indicates that the TV signal may not have come in.

2.Look at the blue screen and whether there are snowflakes; If there are snowflakes, the TV is not bad.

3.There is no snowflake, no black screen, no sound, to see if the power indicator is on; Bright is the problem of the TV,If it is not lit, see if there is a problem with the external power supply,Eliminate the power supply problem is the problem of the TV。

A1You can first test if there is a sound; There is a sound indicating that the TV signal is fine, check whether it is improperly adjusted or the TV is faulty. The absence of sound indicates that the TV signal may not have come in.

2.Test it again, if the TV does not have a blue screen, there are no snowflakes; If there are snowflakes, the TV is not bad.

3.If there is no snowflake, no sound, the screen is black, and the power indicator is on; Bright is the problem of the TV,If it is not lit, see if there is a problem with the external power supply,Eliminate the power supply problem is the problem of the TV。

Main reasons:1、Many times you will accidentally press the TV to other signal sources, resulting in a different signal from the set-top box,This will also lead to the situation that the TV has no signal on the blue screen。 2. If the set-top box is forgotten to open, there will be no image and sound.

3. There is a problem with the first-class circuit of the set-top box, resulting in no image broadcasting. 4. If it is because the ** cable connecting the set-top box and the TV is not installed, there will also be a blue screen without signal. 5. The place that controls the high-voltage switch on the AD board in the TV is damaged, and there will also be no signal on the blue screen of the TV.

Suggested solution:1、If it is because the signal source of the TV is adjusted incorrectly,You only need to press the signal source key of the remote control to switch to the same source as the set-top box。 2. If there is no signal on the blue screen caused by the set-top box not being opened, you only need to open the set-top box.

3. If there is a problem with the circuit, you only need to repair the output circuit in the set-top box to reuse. 4. If the connection cable between the set-top box and the TV is not connected, you only need to reconnect the ** cable between the box and the TV to use it. 5. If there is a problem with the position of the AD high-voltage switch on the TV, you need to find a professional to repair it and reuse it.

3. If the power indicator of the TV is off, it may be that there is a problem with the power connection of the TV, resulting in a sudden power failure without an image, such as the power plug is loose, the power cord is faulty, etc., you can check the problem one by one and deal with it accordingly;

4. If the power indicator of the TV is on, it may be that the standby button of the remote control is pressed by mistake, so that the TV enters the standby state, and there is no image displayed, you only need to press the standby button of the remote control again to wake up the TV and restore the normal screen display;

6. If the TV still has no signal after the above methods are checked, it may be caused by hardware failure, such as power module failure, short circuit or open circuit of switching circuit, high-voltage board failure, LCD screen or screen cable failure, motherboard chip or other parts failure, etc., it is recommended to contact the after-sales service of the TV to overhaul the TV.

Question: None of the above.

Answer: If the TV still has no signal after the above methods are investigated, it may be caused by hardware failure, such as power module failure, short circuit or open circuit of switching circuit, high-voltage board failure, LCD screen or screen cable failure, motherboard chip or other component failure, etc., it is recommended to contact the after-sales service of the TV to overhaul the TV.

How to adjust the TV without signal, what to do if the TV has no signal.