When the LED display has no signal, the backlit white screen has a bright picture

The white screen failure of the LCD LCD display may be caused by the LCD panel drive circuit problem, the LCD panel power supply circuit problem, the screen wire contact poorly, the motherboard control circuit problem, etc. Since the LCD screen is white after turning on, it means that the backlight and high-voltage generation circuit are working normally, but the LCD panel does not get the driving signal. If the screen disappears after the laptop is turned off, and then the screen is white again, it may be caused by a problem with the power strip.

From the fault phenomenon analysis, whether the LCD LCD screen is turned on or off, as long as the power supply is plugged in, the high-voltage generating circuit is always in working state, and the backlight is always lit. In other words, the high-voltage generation circuit is no longer controlled by the switch, that is, the switching signal sent by the motherboard to the high-voltage generation circuit is out of control. Since the switching signal emitted by the motherboard microprocessor is generally controlled by several transistors, the fault may be a damage to the triode that controls the switching signal.

Fault repair ideas for the white screen of the boot display.

1. First disassemble the shell of the LCD display, and then check whether the screen cable interface is loose or not connected. After checking, the screen cable is connected normally.

2. Then turn on the power switch of the laptop, and then use a multimeter to measure whether the power supply voltage of the screen cable interface is normal. If the supply voltage is normal, go to step 5; If it is not normal, then check whether the fuse resistor or fuse inductor near the output of the screen cable is open or damaged. If it is damaged, the damaged component can be replaced.

3. If the fuse resistor or fuse inductance near the output end of the screen cable is normal, then check whether the output voltage of the DC-DC voltage conversion circuit supplying power to the LCD LCD screen is normal. If the output voltage is abnormal, check the fuse resistor, PWM controller, switch tube, inductance coil, filter capacitor and other components in this power supply circuit, and then replace the damaged components.

4. If the voltage at the output end of the DC-DC voltage conversion circuit is normal, there are damaged capacitors and other components between the output end of the DC-DC voltage conversion circuit and the interface of the screen line, and the damaged components can be checked and replaced.

5. If the power supply voltage of the screen cable interface is normal, then check whether the timing signal and driving signal in the LCD panel drive circuit are normal. If it is abnormal, check the output signal, input signal and power supply voltage of the chip that generates this signal respectively to determine whether the driver chip is damaged. If it is damaged, it can be replaced.

Through the above understanding, the LCD LCD screen appears white screen phenomenon is not a preliminary understanding, the display screen boot white screen maintenance is not as easy as the display screen black screen, need to master some circuit knowledge about the display screen, the safest way is to ask more professional personnel to help you, find out the cause to solve.

The display is mainly divided into two parts, 1 is the backlight, and the working is a white screen. 2 is the display signal.

Look at your problem, there is a picture explanation The display signal has an input, but the signal is not normal.

There are two main reasons for the abnormal signal of the display screen

1. The signal cable of the screen is off or in poor contact (but you said that the monitor will be restored after 10 seconds, which should not be a problem).

2 Circuit power failure.

It should be that a component on the display signal board that provides power to the screen is faulty, and it fails after working for a period of time, causing the display signal to not work, and it is restored after shutdown.

It is recommended to send it to a workshop for repair. I think it's a bad mos tube.

If you're experiencing issues with the backlit white screen of your Crack Sen monitor, there could be a variety of reasons. Here are some possible solutions:

1.Check the connection: The first step is to check the connection.

Please make sure that all cables, including power cords, data cables, and ** cables, are properly connected. If some cables are loose or not connected, connect them back to your monitor and computer. If you're using a laptop, check that an external monitor is properly connected.

2.Adjust brightness: If your monitor is backlit with a white screen, it may be because the brightness is set too high. Try lowering the brightness setting and see if it improves.

4.Check the hardware: If the problem persists from using the above methods, check if the hardware is damaged or faulty. You can contact your computer or monitor manufacturer, or find a professional repair service.

5.Check your monitor settings: You can also try opening the monitor menu to check if the settings are correct. Some monitors may require manual adjustment of parameters such as backlighting.

In conclusion, there are a variety of possible causes for the problem of a white screen backlit on a monitor, and you need to take corresponding solutions according to the specific situation. With the steps above, you may be able to find the problem and fix it. If you encounter other problems, you may wish to seek professional help.

Hello The white screen is mainly because the power supply circuit for the screen signal on the driver board is abnormal, and there is no power supply in the past, and then the backlight is on normally, but the signal is not close, so it looks like a white screen. If you want to analyze, you generally need to analyze the power supply circuit on the driver board to the LVDS signal.

If you have a tool, you can measure the 30pin cable of the LVDS signal on the driver board, generally there are a few red ones on the corner, and measure to see if there is 5V, if not, it is this problem, (normally there is 5V).

Generally, this kind of problem, if you repair it, it is good to change the parts, and the cost is not much, less than 1 yuan. But the repair shop should charge 30 50 dollars.

In addition, it is stated that since you are a newly bought monitor, don't disassemble the machine without permission, and send it directly to the after-sales service, otherwise you will disassemble it yourself, and the after-sales service will not give you a warranty.

It's a problem with the monitor, and it should be possible to replace it with a new one in 1---3 months;

It should be possible to repair it for free within 3 years, find a seller! Or find a repair shop

It can be determined that the logic board or driver board is broken, and it should be replaced in a month, so don't delay the time.

98% of the white screen is a display problem, and this problem is more broken than the logic board.

1. The general causes of LED full-color display problems are as follows.

1. Power supply (the host or screen is not powered).

Check whether there is a problem with the empty line and the power supply.

From the computer to the main control processor to the sending card to the first receiving card, the signals are checked and repaired one by one in order.

3. Synchronization card (failure of receiving or sender).

Second, the general problems of single and double color screens are as follows.

1. Power supply (main control or screen is not powered).

Check whether there is a problem with the empty line and the power supply.

2. If the main control is broken or the cable is not connected to the right port, or the unit board is faulty, check and replace the maintenance one by one in order.

If some of them don't light up, the same goes for the above, and some new screens need to be debugged to be displayed!

The above is the main problem of the black screen of the main LED display, if there are other problems can not be solved, you can go to a treasure to find me, my name is the name of the name (Zhiyuan) professional production, installation and maintenance of various LED displays, can be sent for repair or door-to-door maintenance.

First unplug the data cable connected to the DVI port of the graphics card, start the computer, and plug in the data cable connected to the LED screen master control card after the computer is fully started, set multiple displays to the graphics card control panel, and set the graphics card display mode to "copy mode 289410546".

Professional LED display technical support

First of all: when the control card is not connected, when the electrostatic finger touches the circuit of the unit board, there will be some waiting for the light to be on and some lights to be on. Because you don't give him a signal, he will change irregularly.

But sometimes cutting corners and monochrome boards may burn out because of this, it is recommended to power the screen as little as possible without connecting the control card

Secondly: 1 Check whether the OE jumper of the control card is correct.

2. Whether the riser card is suitable and easy to use.

3. Whether the control card and the adapter card, the adapter card and the unit board are connected correctly.

4. Carefully and double-check that your settings are correct.

I think it's most likely that your OE jumper is wrong, good luck.

It should be that you don't set it up properly or there is a problem with the palace line behind it.

The white screen is generally a problem with the screen power supply, mainly starting from the screen power supply, first check whether the screen line is normal, and then whether the power supply insurance is burned out. Finally, the power management chip of the screen (that chiplet) is normal.

This should be the circuit of the tail plate.

First of all, I think yours might be an LCD display instead of an LED

Generally speaking, if the LCD screen has a white screen, it is due to more problems with the power supply circuit of the LCD screen, that is, the voltage difference. The working mode of the LCD display is: the LCD screen works after powering up, and the LCD screen will have a white screen if it is not powered on.

If the power supply mode of various working voltages of the screen is provided by the motherboard, the difficulty of overhauling the motherboard is relatively small, and there is more relevant information.

If it's the other way: the motherboard of the computer only provides one voltage, and the other voltages required by the display screen are generally provided by the circuit board behind the screen. In this case, the LCD screen is very easy to scrap, and it is difficult to repair. It needs to be returned to the factory.

In short, the failure of the LCD screen with a white screen is more complicated, and it is best to send it to the maintenance department for professional maintenance or return to the factory for processing.

You see if the data cable of the screen is broken or not connected.

Brother, don't be sad, the old doesn't go, the new doesn't come.