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How to solve the problem of white screen on the LCD screen

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LCD liquid crystal display after the boot, the screen shows the white (Bai Ping) fault, which is the fault of the white screen boot screen. LCD liquid crystal display Boot Black, blue of the fault is common, black, blue is a system or there is a hardware problem, and the display boot screen fault are generally, LCD liquid crystal display their own fault. The failure causes of LCD LCD white screen failure may be caused by the LCD panel driving circuit, the LCD panel power supply circuit, the screen line contact problem, and the main board control circuit. Since the LCD liquid crystal display after the white screen, which shows the backlight and high voltage generating circuit is working, but the LCD panel does not get the driving signal. If the laptop off the screen disappeared, and then again white screen, may be caused by the power board problem. From the fault analysis, LCD LCD screen regardless of the power or power off, as long as the plug in the power supply, high voltage generation circuit is always in a state of work, the back light source is always lit. That is to say, high voltage generation circuit has not been controlled by the switch, that is, the main board to the high voltage generating circuit issued the switch signal lost control. Because the switching signal from the main board microprocessor is normally controlled by several transistors, the fault may be damaged by the control of the switch signal. Boot screen white screen failure maintenance ideas .
1, the first LCD LCD screen to open the shell, and then check the screen line interface is loose or not connected. Check screen line connection is normal.
2, then turn on the power switch of the notebook computer, and then use the meter to measure the power supply voltage of the screen line interface is normal. If the supply voltage is normal, go to the fifth step; if it is not normal, then check the screen line output near the insurance or insurance is open or damaged inductance. If it is damaged, replace the damaged components.
3, if the screen line near the output voltage of the insurance or insurance is normal, and then check for the LCD LCD screen power supply voltage conversion circuit of the DC-DC output voltage is normal. If the output voltage is not normal, check the power supply circuit in the insurance resistance, PWM controller, switch tube, inductance coil, filter capacitors and other components, and then replace the damaged components can be.
4, if the DC-DC voltage converting circuit output voltage normal, DC-DC voltage converting circuit output end to screen line interface between the damage of capacitance components, check and replace damaged components can be. 5, if the power supply voltage of the screen line is normal, and then check the LCD panel driver circuit in the timing signal, the driving signal is normal. If it is not normal, respectively, to check the output signal of the chip to produce this signal, the input signal and power supply voltage, so as to determine whether the driver chip damage. If it is damaged, then replace it. Switch on the mobile phone screen screen repair not like screen black, blue as easily as, need to master some knowledge of a display circuit, the best professional display maintenance personnel to repair.