How to repair the LCD screen of a game console, how to repair the LCD monitor

1) Power failure: This is a very simple fault, the general LCD extension power supply and external power supply, the outside of 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 capacitors, power switches, power management ICs, rectifier output diodes, filter capacitors, etc.

2) Driver board failure: The driver board burns the fuse or the voltage stabilizer chip fails, some machines are built-in switching power supplies, and output two sets of power supplies, one of which is 5V for signal processing, and the other group is 12V to provide high-voltage board point backlight, if the switching power supply part of the circuit is faulty, it may lead to the failure of both groups of power supplies. 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, so when you find the fault that can't turn on, first measure the 5V voltage with a multimeter, if there is no 5V voltage or the 5V voltage becomes very low, then there may be 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 conversion to 5V, this fault is very common, check the 5-terminal regulator block (common model 8050SD—LM2596— AIC15-01, etc.).

Another possibility is that the load of 5V is heavier, and the 5V voltage is pulled very low, in other words, there is a problem with the signal processing circuit of the rear stage, and some circuits are damaged, causing the load to be heavier, and the 5V voltage is pulled very low. On the one hand, the program of the MCU is flushed out, which may cause it to not boot up.

There is also the MCU itself damage, for example, the MCU's I O port is damaged, so that the MCU can not scan the keys, encountering this fault caused by the MCU, it is useless to find the problem of hardware, even if you change the MCU, it will not solve the problem, because the MCU needs to be programmed and coded, in the case of no way to find the original AD driver board to replace, we can only use the general AD driver board to replace such as: 151D or 161B, etc.

Depending on what the problem is, it is best to send it back to the manufacturer for inspection and maintenance.

You're talking about a monitor that uses a power adapter to provide power, the button turned out to be broken, and now it can't be turned on, the power adapter is good, and now I want to fix it myself, and the multi-power in my hand means a multimeter, right?

First of all, check whether the power supply of the power adapter is on the power board and the signal board, whether there is a problem with the power supply excuse, or whether there is a problem with the internal wiring.

The second is to check the boot signal cable, and by the way, check the switch button to see what the problem is. Whether there is a situation where the boot signal cable is broken and the machine cannot be turned on.

Check again to see if the power indicator of the display is reflected, unplug the VGA cable on the graphics card, and turn on the power indicator to see the situation. If it flashes or lights up after turning on, it is most likely that the capacitor on the power board is leaking, and the capacitor is replaced and tried again, generally using 25V470UF. If it still doesn't work, it is most likely a problem with the lamp, which will age after a long time, increase the excitation current of the lamp, and protect the circuit.

Most of your monitors are faulty, I hope it helps you!

I think try to change the power adapter first, many of them can't be turned on because of poor power supply, if the adapter has screws, you can remove it first to see if there is a capacitor burst.

And then there's the switch, which you have to solve!

After disconnecting, measure the power supply first to see if it is powered on, and then see if your control switch can work properly, and there should be no problems in other places!

This kind of problem is a common fault in the maintenance of the display, which is extinguished in a flash, and the power light of the display is on, indicating that the power board in the high-voltage integrated board of the power supply is good, and it is the high-voltage part and other problems. Here's why:

1.Lamp, this thing and the LCD screen together, 1916 should be four lights, one of them has a problem, it may also be aged, or there is an open circuit in the middle, after this situation, the high-voltage plate will be automatically protected, so that there will be a black screen after a while.

2.The high-voltage strip high-voltage part of the virtual welding or poor performance, normal at the beginning, of course, the lamp must be somewhat aging, and the above problems will occur after a period of work.

If you repair, the cost is not high, 50 yuan is enough, but because replacing the lamp is a risky technical work, the fee is within 200 yuan.

If you don't have a warranty, look for after-sales service, don't repair it if it's out of warranty, there is a problem with the screen of the display, it may be that one of the lamps inside is broken, and you can only replace the screen.

The power strip or the lamp is 35 yuan for the integrated version of the power supply and the lamp is 8 cents a piece You see where it is, just these 2 places.

Tell you the reason for the problem for sure: the display tube is broken, otherwise the high-voltage strip is broken, you say that the top is very dark, indicating that the upper tube is not bright, and the bottom is bright, why will it go out in a few seconds, it is because the high-voltage plate is automatically protected, if you keep a lamp tube on and not extinguished, it will be troublesome, I hope to help you!

I'm not from Beijing, so I'll reply to you when I see the question.

1.There are many reasons for the black screen, in fact, some situations are not really black screens, they are dark screens, this situation is mostly caused by the aging of the sky light tube, if so, it should be no problem to change the light tube. **I won't report it, I don't want to say much about industry problems.

2.In the real sense of the black screen, this kind of fault mostly appears in the high-voltage board, because the high-voltage board generates a voltage of about 700V to supply power to the lamp, such as the high-voltage board failure, the high-voltage board can be replaced.

3.If the power indicator light is also not on, it may also be a problem with the power strip, and it can be replaced or repaired.

The above is for reference, and it is inconvenient for me to say that it involves the best issues in the industry. Excuse me, I hope it helps!

The power strip or the lamp tube is in these two places.

1. The LCD is not powered on (each indicator is not lit), there is no reason to say that there is a problem with its interface circuit, signal channel, high-voltage board, backlight circuit, LCD screen, etc.;

First of all, there is a general suspicion of power supply circuits, especially DC DC conversion circuits;

Only after it is determined that there is no major fault in the power supply circuit can the conclusion that there may be faults in other parts;

Second, the LCD appears white screen, indicating that the high-voltage board and backlight circuit and their power supply circuit are normal, and the possible faulty parts are:

1. Virtual welding of signal processing circuit, capacitor leakage;

2. The interface circuit has poor contact and disconnection of the interface seat;

3. The voltage of the power supply circuit is abnormal; For example, if the power supply circuit fails, the voltage regulator is generally damaged;

4. The LCD screen is not working, generally the +5V power supply circuit is missing, and the line and field signals are abnormal;

5. a motherboard controls the main chip;

6. The LCD screen is damaged;

LCD white screen (or black screen), most of which are caused by the loss of power supply voltage of the LCD panel, that is, Article 4 of the second item; Therefore, landlords should beware of financial losses caused by misjudgment or other reasons by the maintenance department.

White screen glitch 1The white screen phenomenon indicates that the backlight board can work normally, first judge whether the motherboard can work normally, you can press the power switch to see if the indicator light has any response, if the indicator light can change color, it means that the motherboard is working normally). 2.

Check whether the connection cable of the motherboard signal output to the screen is in poor contact (the connection cable or screen can be replaced). 3.Check whether the voltage of each working point of the motherboard is normal, especially the power supply voltage of the screen.

4.Use an oscilloscope to check the field signal and the clock signal (from input to output).

5.If the indicator is unresponsive or does not light up, it means that the motherboard is not working properly6Check the voltage of each working point of the motherboard, pay attention to the voltage of EPROM (left and right), reset voltage (high or low, depending on the model), and CPU voltage.

If there is a short circuit in the power supply, it is necessary to carefully find the location of the short circuit, and there will be a possibility of a short circuit in the copper foil of the PCB board. 7.Find out if the CPU pins are in good contact with the motherboard.

8.Check whether the motherboard chip and CPU are working, and use an oscilloscope to measure whether the crystal oscillator is vibrating. 9.

Replace or reflash the CPU if necessary.

Black screen glitch 1The first thing to determine is whether it is a problem with the motherboard or the backlight board, you can check if the indicator light is responding, if even the indicator light is not on, you need to check the power part of the motherboard. 2.

Use a multimeter to measure the working points of each main power supply, whether the fuse is blown to disconnect the power supply, use the resistance file to measure whether there is a short circuit at the main power supply working points, and carefully find the wire (whether the circuit board copper foil is short-circuited) and each related component (whether it is damaged, whether it is tinned).

3.If there is no short circuit, it can be repaired with reference to the white screen phenomenon to ensure that the input and output of the voltage and signal at each working point are in normal working condition. 4.

If the motherboard is working normally, check the backlight board5Check that the motherboard-to-backlight board connection is in contact with the main good. 6.

Use a multimeter to measure the voltage of the backlight, to have a 12V power supply voltage, to have a switching voltage and 0-5V backlight adjustment voltage, the switching voltage of the backlight is the most important, if there is no voltage or the voltage is too low, to check whether the output level of the CPU and the working state of the transistor is normal, pay attention to whether there is a short circuit, if necessary, replace the components.