1. There may be a problem with the signal source input of the TV set, resulting in a blue screen, that is, the cable is loose or has poor contact, which can be solved by reconnecting and fixing it.

2. It may also be caused by the mismatch between the TV signal source mode and the input signal source. For example, when an AV cable is connected to a set-top box, the signal source has to switch to AV mode to get a picture, otherwise a blue screen will appear; At this point, you can press the signal source key of the remote control to pop up the signal source menu and switch the signal source modes one by one until the TV returns to the normal TV screen.

3. It may also be the blue screen caused by the hardware failure of the TV set, including the blue screen caused by the failure of each signal input interface of the TV set, the impassability with the motherboard circuit, the failure of the CPU of the TV set to recognize the input signal, or the failure of other components of the motherboard to make the TV set unable to recognize the signal input; It is recommended to contact the TV after-sales service for comprehensive inspection and warranty.