The monitor is dead? The monitor is not powered on where it is broken

1. The power failure of the display is not displayed when the display is powered on.

This is a very simple fault that should be said to be a general LCD.

There are two kinds of power supply inside the extension and external power supply, and the one outside the machine is more common. Regardless of the power supply, its structure is much simpler than the power supply of CRT display, and the vulnerable ones are generally some small components, such as fuses and rectifier bridges.

300V filter capacitor.

Power switches, power management ICs, rectifier output diodes.

filter capacitors, etc.

Second, the display is powered on and there is no fault of the driver board of the display.

If the driver board burns the fuse or the voltage regulator chip fails, some machines have a built-in switching power supply and output two sets of power supplies, one of which is 5V for signal processing, and the other is 12V for high-voltage board point backlight.

1. If there is a fault in the circuit of the switching power supply, it may cause the two groups of power supplies to be not output, first check whether the 12V voltage is normal, and then check whether the 5V voltage is normal, because the working voltage of the MCU chip of the AD driver board is 5V.

2. If you want to find the fault that can't be turned on, use the multimeter first.

Measure the 5V voltage, if there is no 5V voltage or the 5V voltage becomes very low, then one possibility is that there is a problem with the input stage of the power supply circuit, that is to say, there is a problem with the power supply part of the 12V to 5V conversion, this fault is very common, check the 5-terminal regulator block.

There are many reasons for this situation, on the one hand, the MCU's program is flushed out and may not boot up, and the MCU itself is damaged, for example, the MCU's I O port is damaged, so that the MCU can't scan the keys, and when you encounter this fault caused by the MCU, it is useless to find the problem of hardware, even if you change the MCU, you can't solve the problem, because the MCU needs to be programmed and coded, In the case that we can't find the original AD driver board to replace, we can only replace it with a generic AD driver board such as: 151D or 161B, etc.

3. Another possibility is that the 5V load is heavier, and the 5V voltage is pulled very low, that is, there is a problem with the signal processing circuit of the rear stage, and some circuits are damaged, causing the load to increase. Pull the 5V voltage very low, check the components that have problems in the rear stage one by one, and replace the faulty components, the 5V can return to normal, and the fault is generally solved.

The computer monitor not powering on may be:

1. The circuit connected with the display is damaged, resulting in no power: first turn on the power switch of the display, if the power indicator is not on, then check whether the power cord plug on the back of the monitor is loose or fall off, plug it up tightly and check whether the power cord is plugged into the socket is energized, if the circuit is energized and the plug is plugged in tightly, then the indicator light should be on.

2. The display is damaged: If the display itself is damaged, it will not be able to light up even if the above operations are carried out. This can also be determined by replacing the monitor, such as connecting this monitor to a normal host or connecting a normal monitor to this host for testing.

If this happens, you will have to replace it with a new monitor.

The display is usually equipped with a alignment film on two glass substrates, and the liquid crystal will be aligned along the groove, because the alignment groove of the glass substrate deviates by 90°, the molecules in the liquid crystal are neatly arranged one by one in the same plane like a blind, and the nematic column of the molecules will gradually twist 90° when transitioning from one liquid surface to the other, that is to say, the phase difference of the arrangement of the two layers of molecules is 90°. Generally, the most commonly used liquid crystal type is nematic (NEM different kinds of display atic) liquid crystal, the molecular shape is slender rod-shaped, about 1-10nm in length and width (1nm=10am), under the action of different current electric fields, the liquid crystal molecules will be arranged in a regular rotation of 90 degrees, resulting in a difference in transmittance, so that the difference between light and dark is produced under the action of power on and off, and each pixel can be controlled in this principle, and the required image can be formed.

If the host is turned on, the monitor is powered on but the screen is not displayed

1. Check the signal cable, reconnect it, or replace it with a new one.

2. Disconnect the computer hard disk and optical drive first, that is, select their signal cables and power cables. Then turn on the power and keep pressing the del key or F2 key, you can generally enter the BIOS settings, and if you can't read the manual, see how to enter.

Then it is to see if the first screen of the computer can be displayed when it is turned on, that is, the information such as the CPU, memory sticks and so on will be displayed, if not, you have to replace the memory, graphics card, CPU, and power supply one by one, if you can display the first screen, it is a matter of hard disk or optical drive.

3. After the first screen is displayed, connect the hard disk to the system, boot into the BIOS, if the hard disk can be recognized, then redo the system. If it is not recognized, the hard drive is faulty, repair or replace it.

Maintenance of hard drives:

1. Keep the computer working environment clean.

The hard disk is connected to the outside world by a breathing hole with a superfine filter paper, and it can be used in an ordinary indoor environment without a purification device, and if it is in a dusty environment, it will be adsorbed to the surface of the PCBA, the inside of the spindle motor, and the respiratory filter will be blocked, so it must be dustproof. In addition, humid environments and unstable voltage can cause damage to the hard drive.

2. Develop the habit of shutting down the computer correctly.

Sudden power off of the hard disk while working may cause the head to rub violently against the platter and damage the hard disk, and will also cause the head to not reset correctly and cause scratches on the hard disk. When shutting down, be sure to pay attention to whether the hard disk indicator on the panel is still flashing, and only when the hard disk indicator stops flashing and the hard disk ends reading and writing can it be shut down.

3. Move the hard disk correctly and pay attention to shockproof.

When moving the hard disk, it is best to wait for the shutdown for more than ten seconds before the hard disk is completely stopped. When the hard disk rotates at high speed during boot, the slightest vibration may cause the disc and the read/write head to rub against each other, resulting in bad magnetic track or damage to the read/write head. Therefore, in the state of booting, do not move the hard disk or chassis, it is best to wait for the shutdown for more than ten seconds before the hard disk completely stops before moving the host or restarting the power supply, which can avoid the power supply from causing damage to the hard disk due to instantaneous surges.

In the process of installation and removal of the hard disk, you should be more careful, it is strictly forbidden to bump the hard disk when moving and transporting, and it is best to protect it with foam or sponge packaging to minimize vibration. Note: The so-called "crash resistance" or "shock resistance system" of the hard disk manufacturer refers to the shock resistance and crash resistance of the hard disk when it is not turned on, not the boot state.

It could be one of the following reasons:1The power cord is not connected or plugged in tightly2

The power switch of your computer or monitor is not on3If there is a problem with the power outlet, you can start shipping to try to replace the outlet or use a different outlet4There is a problem with the monitor's power adapter and needs to be replaced or repaired5

If the display itself is faulty and needs to be repaired or replaced, it is recommended that you check the above reasons to find the problem and solve it. If it cannot be resolved, it is recommended to contact a professional or after-sales service.

Summary. Hello, the computer host is not powered on, the display screen is powered, first connect the power cord of the display screen to the host to see if it can be turned on, used to rule out the cause of the power cord, the second host button may cause, turn on the host, short the power button on the motherboard corresponding jumper to see if it can be turned on, the third reason may be that the host power supply problem can not be turned on, the fourth will host power to the interface on the motherboard unplugged and replugged to see. Basically, it's just these four situations to see what the specific causes are.

Hello, the computer host is not powered on, the display screen is powered, first connect the power cord of the display screen to the host to see if it can be turned on, used to rule out the cause of the power cord, the second host button may cause, turn on the host, short the power button on the motherboard corresponding jumper to see if it can be turned on, the third reason may be that the host power supply problem can not be turned on, the fourth will host power to the interface on the motherboard unplugged and replugged to see. Basically, it's just these four situations to see what the specific causes are.

How to try the second one.

Since the power supply problem has been ruled out, the host lights are not lit, it is very likely that there is a problem with the motherboard, because the power lights and hard disk lights on the host are powered by the motherboard, and if they are not lit, the motherboard is not powered.

The computer host is out of power, and the monitor is powered.

If the brain host is out of power and the monitor is powered, the possible reasons are as follows:1Power failure:

Check whether the power cord of the computer host is plugged into the power socket, whether the power plug is plugged in, and whether the power of the computer host is turned on. If all of this is fine, it may be caused by a power failure of the computer's main computer. 2.

Internal connection failure: The internal connection cable of the computer may be faulty, causing the computer to fail to boot. You can disassemble the computer and check whether the cable is loose or damaged.

3.Graphics card issues: There may be a problem with the graphics card in your computer's console, which is preventing the image from being displayed.

You can try removing the graphics card, cleaning it, and plugging it back in. 4.Motherboard issues:

If there is a problem with the motherboard of the computer, it may cause the computer to fail to boot. You can try cleaning the motherboard and connectors to check for damage. If the computer host is out of power, but the monitor is powered, there may be a problem with the power supply of the computer host, and some troubleshooting is required.

First of all, check whether the power cord of the computer host is plugged into the power socket and whether the power plug is plugged in properly, if these are all right, then you need to check whether the power of the computer host is turned on. If the power is turned on, but the computer is still out of power, then you need to turn on the computer to see if the internal cable is loose or damaged. If you don't find a problem with the internal cable, then there may be a problem with the graphics card of the computer host, so you can remove the graphics card, clean it and plug it back in.

If the problem still cannot be solved, then there may be a problem with the motherboard of the computer host, and you need to clean the motherboard and interface to check whether there is any damage.