1. When using LCD TV, its screen often flashes. When encountering this problem, many people choose to turn it off first and then turn it on. Other functions are normal, such as voice and remote control buttons.
2. It may be that the protection circuit of the backlight on the LCD screen is disconnected, and the abnormal backlight voltage causes the screen to flash, because the most important part of the LCD is the display and the protection circuit.
3. First, check whether the socket connection of the backlight booster board is normal, and then weld if there is any; Check whether the socket is plugged tightly again. If it's tight, there's no problem.
Second, the LCD TV fault maintenance-boot is not reflected
1. After turning on the LCD TV, it is found that there is no response, but the sound and remote control are normal. First check the power supply voltage of the backlight circuit. If the power supply voltage is abnormal, it will lead to this phenomenon. Generally, the large screen voltage is 24V, and the small screen voltage is 12V. The instructions for TV sets are also marked.
2. Then check the switch control signal of backlight to see whether it is started at high level and whether the measured signal waveform is normal. If there is any problem, carry out corresponding maintenance. The specific operation depends on the actual situation.
3. If it can't be solved, it is necessary to replace the new booster board. If it still doesn't work, it is a multi-position backlight failure. Check the circuit and replace it with a new backlight.
Three, LCD TV fault maintenance-poor contact
1. When using LCD TV, the most common fault is poor contact, which shows no display and no sound. You need to check the backlight and sound system first, and then make step-by-step judgment and step-by-step maintenance.
2. After starting the machine, the power light does not light up. It is very likely that the power board is out of order or the CPU is out of order. First, check it with a multimeter or test pen. If there is any problem, refer to the actual damage and choose the appropriate replacement or maintenance.