How to repair the LCD TV when it takes 20 minutes to turn on the screen?

If it is an LCD TV, it is a problem with the power supply circuit, and this kind of problem can only be solved by professionals, so it is recommended to contact after-sales or home appliance maintenance personnel to deal with it.

There may be three reasons: one is that the power output of the TV is not normal, the second is that the load of the power board of the TV is problematic, and the third is caused by the unbalanced protection of the backlight board.

Check for any of the above issues that may arise:

1. First of all, we need to check whether the power cord of the TV is loose, there is poor contact, etc., if so, we only need to reconnect the power cord.

2. Secondly, we need to check whether there is obvious damage to the electronic components of the circuit, such as whether the electrolytic capacitor is bulging, leaking, and the packaging skin is broken, whether the resistor is scorched or white, whether there are black spots on the surface of the integrated circuit and transistor, etc., if there is damage, the corresponding parts need to be replaced.

3. After that, we need to disconnect the power output, check whether the power supply is normal, and finally check whether there is a problem with the load circuit.

When placing furniture, the TV should be placed in a cool and dry place as much as possible, and leave an open gap between it and the wall to dissipate heat. If you need to clean, wait for the temperature of the TV to return to normal before wiping with a dry cloth. Morning difference.

Summary. Hello, I have seen your question and am sorting out the answer, please wait patiently for a minute.

Hello, I have seen your question and am sorting out the answer, please wait patiently for a minute.

If the TV starts after a few minutes or even more than ten minutes to see the image, and the spine source is from blurry to clear and gradually changes to be able to watch normally, this is caused by the dampness of the picture tube socket and the leakage of the focusing pole voltage, your TV will have to wait for a period of time before the town can be lit to indicate that the leakage of the tube socket is very serious, and the tube socket should be replaced in time to eliminate the fault. ”

According to different situations,The reason why the internal switching power supply of the TV will automatically shut down immediately after turning on is different,Because the TV has a sensitive overvoltage、Overcurrent、Automatic protection to turn off the rotten branch circle function,The following situations may automatically shut down:

1.Shut down just after seeing the image, it is the small electrolytic capacitance of the switching regulator power supply circuit that degrades, causing the switch tube to run out of control and cause the output voltage to be too high;

2.As soon as the machine is turned on, it shuts down after hearing a squeak, which is the gap between the soldering of the pins of high-voltage and high-power devices and the ignition of the printed plate;

3.A few seconds after turning on the machine, a bright line appears on the screen, that is, the machine is turned off, which is a field scanning circuit failure;

4.If the boot amplitude is insufficient to shut down, the filter capacitance of the row tube will change the value, so that the state of the line switch will not match the current increase;

5.After the power is turned on, the high voltage is too high or the brightness is out of control, and the grating is particularly bright to shut down the ray protection;

6.The boot indicator light is activated, but there is no accompanying sound, and the grating returns to the standby to shut down, which is a serious AC leakage fault in the circuit components. Of course, there are also protection circuit components deterioration, resulting in protection malfunction shutdown faults.

Summary. Hello, could you please take a look at the following workarounds I said:

One is to see if there is a sound; There is a sound indicating that the TV signal is fine, check whether it is improperly adjusted or the TV is faulty. The absence of sound indicates that the TV signal may not have come in.

the second is to see if there is no blue screen and whether there are snowflakes; If there are snowflakes, the TV is not bad. There is no snowflake, no black screen, no sound, to see if the power indicator is on; Bright is the problem of the TV,If it is not lit, see if there is a problem with the external power supply,Eliminate the power supply problem is the problem of the TV。

What is the problem that the LCD TV is turned on for two seconds and does not light up.

Hello, please take a look at the solution I said about the next suspicion of Tong Hall: one is to see if Qin Yin has a voice; There is a sound indicating that the TV signal is fine, check whether it is improperly adjusted or the TV is faulty. There is no sound, indicating that the TV signal may not have come in, and the second is to see if there is no blue screen and whether there are snowflakes; If there are snowflakes, the TV is not bad.

There is no snowflake, no black screen, no sound, to see if the electric wheel source indicator light is on; Bright is the problem of the TV,If it is not lit, see if there is a problem with the external power supply,Eliminate the power supply problem is the problem of the TV。

The power supply can be turned on, and the clock is black.

I hope it helps you: There are many reasons for the black screen of the computer, the common ones are: Poor contact of the display data cable; There is no power supply to the motherboard; Poor graphics card contact or; Poor CPU contact and overheating; "It is strictly forbidden to copy, repost, the eagle sail head in the blue sky" Poor contact of memory modules; poor power performance; The machine is infected with the CIH virus and the BIOS is refreshed destructively.

Microsoft black screen, please patch. Most of these problems are the relationship between memory and graphics card, loose or poor contact, just move it or use the eraser to wipe the gold finger of the interface

It could be due to the following reasons:

1.Power failure: Problems such as insufficient power supply** or a short circuit in the power line can cause the TV to turn off as soon as it is turned on.

2.Faulty display: If the LCD screen is damaged or malfunctions, the TV may turn off as soon as it is turned on.

3.Control board failure: The TV's control board may malfunction, causing the TV to turn off immediately after it is turned on.

4.Ask Smart about TV settings: Some TV settings can cause your TV to turn off immediately after it's turned on, such as auto-off or sleep mode.

If it takes a minute or two to turn on, it is normal, if it takes more than 5 minutes to turn on, it may be caused by the aging of parts in the TV.

1. Due to LCD TV.

During the boot process, the hardware of the TV will be self-tested and provide stable voltage for the LCD panel, etc.,It takes a certain amount of time,So if it takes a minute or two to turn on, it's not slow,This situation is normal,Just wait patiently for the TV to finish booting。

2. If the boot time is more than five minutes, it is basically caused by the aging of the internal parts of the TV before elimination, and the filter capacitor of the power supply part should be checked.

Whether it is aging, breakdown, or damage, it can be replaced accordingly. Non-professional users are advised to contact the after-sales service of the TV for maintenance.

Response time. The so-called "response time" is the response speed of the LCD screen to the input signal, that is, the reaction time of the liquid crystal from dark to bright or from bright to dark. Obviously, the smaller the "Signal Response Time" indicator, the better.

The smaller the response time, the less the user will feel like an afterimage or dragging when looking at the moving screen. Moreover, the requirements for LCD TVs at this point are more than LCD monitors.

It's even higher. Because computer monitors are generally used for text, ** and other static screen display time, the requirements for this indicator are not obvious. The TV is mainly active and dynamic, the shorter the signal response time, the better the display effect.

The data shows that the response time is 30 milliseconds, and the TV can display 33 frames per second, which is enough to meet the needs of *****. The response time is 25 milliseconds, and the TV can display 40 frames per second, which is fully suitable for ***** and most movies or games.

When we buy a TV, we should look at the TV picture from multiple angles, such as choosing a front screen in the angle, and then offset some angles, and stand at the same level as the TV screen to see if we can see the image; During the inspection of the machine, you can also let the **staff** some other speed faster screens to see whether the screen display action is coherent and whether there is a phenomenon of picture tailing.

LG LCD TV black screen or dimming fault is the more common fault seen in all the faults of LG TV,No matter what brand of LCD TV black screen dimming fault is the most,The following is the reason why the black screen dimming fault will appear after the LCD TV is turned on for everyone who specializes in LCD TV maintenance,For your reference。

The screen will be black and there will be no sound as soon as it is turned on:

It may be that the power module has virtual solder joints, because after a while of broadcasting, the circuit board is deformed due to heating and poor contact.

If the power supply is damp and the drive power supply is abnormal, it will turn on and off, and replace the driver board. The high voltage is unstable, go to repair the high pressure plate.

After the start-up, it has been dark, and the cause of the fault is that the brightness is too low, the brightness control part has the component deterioration, and the problem of the picture tube (rare in maintenance). Solution: Turn up the brightness, detect the element or the accelerating pole voltage, and replace the picture tube.

The brightness is low after a period of power-on, and it will be normal after a while. The cause of the fault is the leakage of the pipe base, and the solution: replace the pipe base.

The screen will go black as soon as it is turned on, and there is a sound:

After analysis, we know that most of the phenomena like this are the backlight board is broken, and the backlight board protection is divided into two types, one is over-voltage, and the other is over-current protection. There are also two ways to judge whether it is over-voltage protection or over-current protection, one is that if it is over-voltage protection, the display screen is lit for about a second or so, and the lamp is extinguished instantly after the overcurrent protection is lit; The other is the detection control IC, the backlight control used in this machine, after comparison, I measured that the voltage of the 1 pin of T5 is different from that of other groups, and the voltage is greater than 300MV, so the T5 is replaced with a new one, and the fault is troubleshooting after replacement.

The screen will be black or dim after a while after the LG LCD TV is turned on,If you are not sure to solve it,We'd better contact LG customer service or call the LG TV repair on this**,We will send a professional TV maintenance technician to your door for testing。

If you open the blur, it will be fine for a while, then it may be that the tube seat is broken.

This is a soft fault and is a bit complicated to check, depending on the fault phenomenon.

There may be 1Where there is virtual soldering on the TV motherboard, it can be solved by suspecting that the circuit is repaired in a large area.

2.The TV motherboard has components with poor thermal stability, and the fault is reproduced by heating the suspected components.

3. The voltage in the machine rises and causes a protective shutdown (very small) You can judge the specific fault location according to the method of disconnecting the voltage of each part of the circuit separately, such as the automatic shutdown is that part of the circuit is abnormal, focus on checking that part of the circuit, and the cause of the fault should be found.

It's a malfunction of the picture header.