1, the TV screen is black, and sometimes it is turned on normally. Power off and then on, there is a black screen or colored bar on the branch, which may be a problem with the power supply voltage. The output voltage should be 5V, but now the output voltage is lower than 5V, and the voltage output is obviously abnormal.

2. After the TV is turned on, only the brand name appears and the screen is black. This is a common problem of backlight board. This problem is generally caused by the virtual welding of the high-voltage inverter and the control transistor of the backlight panel.

3. The TV turns on a black screen with accompanying sound and words, indicating that the circuit is basically normal and the lighting conditions of the picture tube are all available. The main faults are brightness channel fault or brightness signal loss and decoding circuit fault.

Extended data:

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Common faults of LCD TV:

65438+

2. There is mosaic one hour after starting, and the sound is normal. The first phenomenon is that the digital board is not good (the through hole is blocked or the IC contact is not good), and the second phenomenon is that the internal wiring contact is not good.

3, boot three no, the power light is not bright, the first is that the power board is broken, and the second is that the CPU part is not working properly.

4. You can't turn it on when the light is flashing. The CPU bus is not working properly or the boot program IC(BIOS) is not good, and the BIOS IC is in poor contact with the CPU.

5. There are black belts and bright lines on the TV screen, which need professional technicians to repair.