android tv box has pictures but no sound

android tv box has pictures but no sound

When your TV is turned on, there is sound but no picture, what is the reason, and how to solve it. Let's take a closer look at our TV, which can be divided into several parts according to this type of problem:

1. Logic motherboard (the board that handles what our TV shows)

2. Power board (the power board that supplies power to the screen and the motherboard)

3. Screen (screen for display)

There is sound but no picture, which proves that our logic board is working normally, but there is a problem with the logic of the picture that our logic board outputs to the screen, or our logic board does not control the power board or the power board itself does not supply power Let the screen backlight brighten up, the screen is too dark for us to see.

Below we briefly describe some situations that may be encountered

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The first situation:

I upgraded the firmware myself, and found that there was sound but no image after the upgrade.

Cause of the problem: The upgraded firmware is not the firmware corresponding to your machine. That is, there is a problem with the logic of the picture that the logic board outputs to the screen, and it is not correctly output to the screen.

Solution: Submit the correct serial number, model and other related information in the corresponding section of the community, and upgrade with the correct firmware~

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The second case:

There is sound but no picture when using the TV. There is no change in the brightness of the screen when the machine is turned on and off, but when you view it close to the screen, there is a little picture, but the screen is very dark, and it is difficult to see if it is not close.

Problem reason 1: There is a problem in the firmware itself, so that the motherboard does not control our power board to make the screen backlight bright

Solution 1: Submit the correct serial number, model and other related information in the corresponding section of the community, and upgrade with the latest and correct firmware~

Problem cause 2: The power cord of the screen backlight is not well connected, that is, the screen backlight is not on, which causes the screen to be too dark for us to see

Solution 2: If you have conditions at home, you can remove the back shell and turn off the power. Leave it for a period of time (discharge the power board capacitor). Check whether there is any problem with each wiring, please pay attention to only touch the wiring place, do not touch other parts of the board, because some places have electricity

Problem cause 3: There is a problem with the power board, power cord and other related hardware

Solution 3: Please contact after-sales service, hardware problems need to be replaced.

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The third case:

There is sound but no picture when using the TV. The brightness of the switch screen has changed, but there is no picture when viewed close to the screen.

Problem cause 1: There is a problem with the firmware itself, and the motherboard does not output signals to the screen

Solution 1: Submit the correct serial number, model and other related information in the corresponding section of the community, and upgrade with the latest and correct firmware~

Problem cause 2: The screen line from the logic board to the screen is in poor contact, resulting in no signal to the screen

Solution 2: If you have conditions at home, you can remove the back shell and turn off the power. Leave it for a period of time (discharge the power board capacitor). Check whether there is any problem with each wiring, please pay attention to only touch the wiring place, do not touch other parts of the board, because some places have electricity.

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