What are symptoms of LCD TV with broken backight bar?

What are symptoms of LCD TV with broken backight bar?

When the screen is turned on, it turns black again, but the sound can be played normally; the screen image is excellent with color cast, the brightness is reduced, and the picture color is out of adjustment; the screen flickers, and the backlight does not turn on when it is on.

1. The screen turns off when it turns on when it is turned on, but the accompanying sound, remote control, and panel button control are all normal. This failure is generally caused by the backlight circuit protection caused by abnormal power supply of the backlight booster board. Mainly check whether the backlight tube is open (for example, the tube socket on the high-voltage board is open or not plugged in) or whether a certain tube is broken.

2. The screen image turns yellow or red, and the brightness decreases. This failure is mostly caused by the aging of the backlight tube, which can be replaced with a new product of the same specification.

3. When the backlight is on and not on, the screen flickers. This failure is generally caused by poor contact between the lamp socket of the backlight booster board and the lamp, the high or low power supply of the backlight, or the aging of the backlight.