LED TV backlight failure how to repair

LED TV has been used for a long time, there will always be big and small problems. The problem we often encounter is that the backlight of the LED TV fails. I believe this term sounds strange to everyone, but it doesn't matter. Next, listen to the specific analysis of the editor, you know how to fix the LED TV backlight failure.

LED backlight failure

First, LED TV backlight fault phenomenon

1.Open the screen

In the maintenance also encountered in the case of damage to the lamp in the screen; The computer is turned on for one hour, the screen turns on, and the sound is normal. This phenomenon is that the digital board is not good, and the other is that the internal wiring contact is not good.

2.There are no images and sounds at startup

There is no sound or image when you power on, the power light flashes and turns on normally, and the screen flashes white when you power on. This failure is mostly caused by damage to the backlight driver board.

The cause of the LED backlight failure

3. On the three "no"

No, the power light is not on. First, the power board is broken, and the other is that the CPU is not working properly. The light does not turn on when it flashes: the CPU bus is not working properly or the boot program IC is bad, and the BIOSIC and CPU contact are bad.

Two. The cause of the LED TV backlight failure

The backlight is on, and the LED screen is on and off. At this time, the stereo, remote control, and panel button control functions are normal. This phenomenon is caused by the protection of the backlight circuit, mostly because the power supply of the backlight boost plate is not normal. For CCFL backlight circuits, if a backlight is open (circuit protection caused by the opening or lack of insertion of the lamp base on the backlight boost plate) or if a lamp is broken, it will cause the above fault. 、

LED TV backlight maintenance

Three. LED TV backlight maintenance

The LED backlight switch has not changed, and the sound, remote control, and panel button control are normal. Then this fault should detect the following working conditions: the power supply of the backlight boost board circuit, the ordinary large screen 24 volts, the rare 120 volts, the small screen 12 volts; The switching control signal of the backlit boost oscillator output by the CPU control circuit is usually a high-level start signal, and the control signal is mostly lit by a lamp of three to five volts. If all of the above operating conditions are met, the backlit boost plate can be replaced. If the backlight boost plate is replaced, the failure is the same as before, and most of the backlight tubes in the LED panel assembly are damaged.