SKYWORTH37M11HMWhat is the reason for the three nos?

1. The fault of this machine may be a problem with the power supply circuit and the motherboard circuit.

Next: First measure whether the voltage after rectification filtering is normal.

Measure whether the voltage at the output end of the power factor correction circuit is normal.

Measure whether the voltage at the output end of the secondary switching power supply circuit is normal.

Measure whether the on/on standby voltage is normal, and whether circuit components such as standby control transistors are also normal.

After the above measurements are normal, if the power-on test machine failure is still there, at this time, then measure whether the output terminal of all DC-DC voltage conversion circuit chips on the motherboard, and whether the pin-to-ground voltage is normal, if there is any abnormality, check the components around the abnormal pins of the chip.

There are several aspects:

First, it is necessary to check whether the VGA cable of the TV end and the ** source end is plugged in and plugged in correctly, and secondly, check whether the HDMI cable of the TV end and the ** source end is plugged in and plugged in correctly, and then check whether the TV signal source is selected correctly.

Second, it is necessary to check whether the signal source of the LCD TV is connected to normal and stable, for example, if the TV is connected to the cable TV signal, check whether there is a problem with the connection line, if the TV is connected to the *** machine or digital TV set-top box, then focus on checking whether the connection line is in good contact, and it can be fixed if it is loose, and it can also be switched to eliminate the problem of the program source.

3. The hardware failure of the LCD TV causes the problem, mainly because of the problem of the display system of the TV, such as circuit switch failure, high-voltage board failure, insufficient power supply, display failure, motherboard circuit, capacitor failure, and other component failures may lead to no display of the picture, it is recommended to contact the after-sales maintenance department of the brand TV for comprehensive testing and maintenance of the LCD TV.

It should be that the motherboard of the TV is broken.

It's happy,What is the reason why it's easy to appear three nos?,It's easy to appear when Skyworth boots up.,You can consult customer service.。

Hello, 1. The circuit board is faulty, causing the circuit to burn, and the circuit will cause the chip to fail. 2、The power start is normal,But Skyworth TV has a black screen。 This black screen may be caused by a problem with the backlight board circuit that is being driven.

It is a circuit failure, and generally this situation should be burned by the circuit. If it's not a burned circuit, it should be a chip failure. Advice and handling methods for re-awarding:

1、The processing method of this is very simple,Buy a household voltage regulator directly,Just use it to stabilize the voltage of the TV power supply at home。 Adjust the voltage of the TV at home to ensure that the voltage is 12V, not lower than 5V. The voltage is normal,SKYWORTH TV will not have a black screen problem when it is **。

2. If there is a problem, you can see if the TV has the high-voltage sound generated when it is turned on, if there is, it is a problem with the circuit working, if not, you can see if the circuit starts normally. 3. You can see if there is a problem with the picture tube filament of the TV, see if it emits light, and if it emits light, you can adjust the rotation of the grille curtain to observe the changes of the entire screen, and the processing methods for different changes are not the same. 4、The reason is likely to be that there is a problem with the internal capacitance of the TV,The solution is to disassemble the TV directly to see if there is a burning capacitor,If there is,Turn off the power immediately,Carry out the corresponding detection work。

If there is a problem with the internal circuit of the TV, you should call customer service in time to report for repair. The reason for this situation is related to the problem of the TV power supply system on the one hand, and the display control system of the TV screen on the other hand. Individual smart TVs may also be related to the operating system, and the probability of this problem occurring is small.

It is not recommended to repair it yourself.

When the TV has a black screen failure, you should first check whether the power cord of the TV is connected stably and whether the socket has power to ensure that the power input is normal. Then,Also observe whether the boot indicator is displayed normally,If the indicator light at the bottom of the TV does not light up after the power is turned on,It means that the TV motherboard is not powered on,You should first check whether the TV voltage fuse is intact,Then check the output voltage of the motherboard power supply module。 If the indicator light of the TV is normal, but the screen beam cannot be lit, you must first check whether the surface of the TV screen is damaged, and rule out the hardware damage of the screen.

Then you need to check whether the screen driver board and the screen power supply module are normal. The screen driver board should check the input and output signal voltages to determine whether there is a breakdown open circuit. The screen power supply module is the key component of the screen lighting, which can detect whether its output voltage is 12V in the power-on state to ensure that the screen is powered on normally.

SKYWORTH37M11HM The solution of the black screen fault requires professional maintenance personnel to disassemble and detect, and the majority of users should not do it themselves when they encounter problems, so as not to destroy the warranty status.

The internal wiring connection of the TV is poorly contacted, and the specific position is poorly contacted, which needs to be disassembled and detected. Under normal circumstances, the parts related to the display are the host power supply, display control and screen power supply, and these parts should be hailized one by one and analyzed and tested before the fault can be eliminated.

With the increase of the use time of the TV, along with the influence of poor heat dissipation, large vibration and other factors, the components on the internal circuit board of the TV, the connectors of the wiring harness and the ports on the circuit board, and the power cord connectors, etc., are all parts that are very prone to failure. When the TV is working, it will produce a lot of heat, especially at present, most TVs are wall-mounted or embedded in the form of furniture, leaving a serious lack of heat dissipation space, once the circuit board is heated, deformation will occur, and some components are insufficient in stress relief during soldering, and the phenomenon that the component pins fall off will occur. In this case, the TV has just been turned on, the temperature of the circuit board is low, there is no deformation, the fault part is in normal contact, once it is heated and deformed, the fault part is disconnected due to thermal expansion and cold contraction, resulting in a black screen.

It is easy to ignore the power plug of the TV in daily life,Sometimes the power plug will be disconnected internally after being plugged and unplugged frequently,When maintaining a certain angle,The broken part is turned on,Make SKYWORTH37m11hm work normally,And when the angle is too large,Cause the line to be disconnected,The TV loses power supply,SKYWORTH37m11hm black screen phenomenon。

Workaround:

1. It is not within the warranty period, if it is, it should be free of charge.

2. Judging from the situation you described, turn on and off the power lamp and flash it, but the power lamp is not always on, if the power lamp flashes and goes out, that is, the power board has a problem and can be repaired, within 100 yuan, if the power lamp is always on, that is, the screen is not lit, but the sound is normal, then the possible problems are as follows, is the driving circuit of the liquid crystal, that is, the drive board has the greatest possibility of problems, can not be driven, this maintenance is more expensive, it costs hundreds of dollars to change the driver board, It is also possible that the LCD backlight tube is broken, or the backlight high-voltage circuit is bad, or the power supply part of the circuit is damaged, and the backlight high-voltage circuit cannot be supplied normally. This will have to be overhauled to know. In the absence of a problem with maintenance, it is irresponsible to say that it is 500 yuan.

500？After-sales want to make money and don't need to go to after-sales When you press the power supply, there is an abnormal noise, and then there is a problem Yes, this kind of little question is crazy, right? Asked a Skyworth after-sales friend said that it may be a problem with soft shutdown When you turn on it again, press the program plus or minus key to see if there is a reaction wood If the wood has it, then consider the power board In addition, my friend said that the power board can be repaired!

1. The current is too large or the current is too small, so that the power supply can not work normally. 2. Whether the TV remote control is already in the timed state or whether the liquid celebration is turned on the child protection state. 3. Due to the long time of TV purchase, the power button in the TV has been damaged.

4. There is a problem with the TV backlight board, which causes the TV screen to be black.

Suggested Treatment:

1、The requirements for the power cord of this TV are extremely strict,I believe that the professional staff will also explain to you many times when you buy,Are you ignoring this problem,If so, it should be replaced in time,Ensure that it can work under more normal conditions。

2、Check that the remote control of the TV is not in the protective state of the child,Because once the protection state of the child is touched,It cannot be turned on,In case the child has a long time**TV,It is also to protect the child's eyes,You can use the remote control to turn off this function,Try again。

3、The TV has been purchased for a long time,Some power keys in the TV will also be damaged or aged,Especially the backlight plate of the TV,It may be due to external impact or improper operation,It will affect his normal work,Find more professional personnel who are pure industry for professional testing,Replace it in time,You can make your TV better serve you。