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Chuangying Electrical Maintenance Service Co., Ltd. <br /> Contact number: 400-6670-951
Address: Room 102, Building 2, Qingxiangliu 7, Duzheng Street, Dingwangtai Street, Furong District, Changsha City, Hunan Province


Maintenance common sense

Position: Home > Maintenance

TV repair method

来源: 本站 时间:2016年05月10日 Author: Source site: Site Time: May 10, 2016
It ’s inevitable that there will be some glitches when the TV is used for a long time, but which faults can be solved by yourself, and which faults must be repaired by a professional master. It is not difficult to make this judgment. Knowing some common faults of TV is But today, Xiaobian has collected some information to take a look.
It ’s inevitable that there will be some glitches when the TV is used for a long time, but which faults can be solved by yourself, and which faults must be repaired by a professional master. It is not difficult to make this judgment. Knowing some common faults of TV is But today, Xiaobian has collected some information to take a look.
1. Common faults of TV sets TV sets will have different faults in the process of use. Below are listed some common faults of TV sets.
1. Automatically search the station and skip immediately, return to the raster without characters; open the internal menu, record all data item by item, replace the memory 24C04, and then open the internal menu to rewrite the original data into the new memory. Press “Jump” button to exit the internal menu, and then adjust the user menu to search again.
2. The automatic channel search can receive the program number and increase, but the channel is not stored after the search, especially when using cable TV;
The program number can rise, indicating that the AFC and line synchronization signals are normal. Disassemble the machine to see if the seventh pin of the memory is grounded. If it is not grounded, connect the seventh pin of the memory to ground. If it is grounded, replace the memory;
3. The field frequency is unstable and slowly moves downwards. This kind of phenomenon generally considers that the fault is the field part. Open the internal menu and copy the original data. Copy the original data after replacing the memory;
4, three no, the indicator does not light; it is estimated that the problem is accessories;
5. The image is reduced, and it is larger and smaller. The main voltage is measured to fluctuate between 130-90V, and Q831, D840, R833, and optocoupler are detected normally. After C839 leakage is detected, the machine is normal after replacement.
6. The image is enlarged; it is suspected that the fault is normal in the power voltage sampling circuit and the resistor is replaced.
7. The start indicator light is on, there is no sound of high voltage after pressing the program key, the indicator light flashes and flashes, no grating appears, the main voltage is normal, and the tube is saturated and conductive. After booting, there is a response when the program key is pressed, indicating that the CPU is working normally. Suspect the line feedback signal.
8. When the switch is turned on, it will pop up immediately after pressing the switch. After the circuit cannot be disconnected, the system can be turned on to indicate that the circuit is faulty. Therefore, unplug the deflection coil, connect the upstream circuit and turn it on again. It is found that it can be opened, and the line deflection coil is suspected to be short-circuited.
9. The image is in the shape of a negative. There is a white frame around the screen around the screen, and a white "ten" shape in the middle, like a "field" shape. This is the image test character in the internal menu of the machine, so I suspect the problem lies in Data in memory is lost.
Second, the TV has sound but no image 1. After turning on the TV, there is only noise and no image. It is likely that there is a problem with the high-frequency head and the middle. According to the working principle of the television, this cause causes sound and no image. The picture tube can display the machine setting menu, and has audio and video interfaces, and can play external audio and video signals.
2. There are sounds of normal TV programs, no picture. This shows that the high-frequency, intermediate-frequency, and sound circuits are in normal working conditions, and there is no short-circuit fault in the line output circuit. If the screen can display the TV settings menu, then this problem is most likely because the sound is separated into the video playback section.
3. The sound is normal and there is no on-screen menu. In this case, you can increase the brightness and contrast of the TV, pay attention to the condition of the screen, and then turn off the TV. If you see a flash of light on the screen at the moment you turn it off, with a slight discharge sound, you can be sure that the picture tube is OK. At this time, it depends on whether the filament of the picture tube is bright.
4. If it is a TV with remote control, it is also possible to lose the image and lose the brightness due to the failure of the CPU chip.
Third, the TV maintenance precautions 1, before the repair to understand the fault state of the faulty TV is very necessary. Whether it is repairing to customers or relatives and friends, this should be considered to avoid being misunderstood by yourself;
2. How to find out the fault status of the faulty TV when receiving repairs?
(1) Ask the specific fault phenomenon, whether the process of the fault occurred suddenly or gradually, what is the current state, and ask these to help analyze the cause of the fault.
(2) Ask the color TV if it has been turned on, if it has been repaired by others, and ask them if you can determine whether you can power on the TV in front of the owner to observe. To find out the fault state of a faulty TV, it is best to look at the TV in front of the owner, and then open the case to observe it carefully.
(3) For "three-nothing" TVs, after opening the case, pay attention to observe whether there is any problem with the tube diameter. You can tap it with your hand a few times, because some broken tube diameters will be fixed by the deflection coil and cannot be seen. The webmaster has encountered such problems before. It also depends on whether the circuit board has obvious failures such as obvious breakage and large-scale burning.
(4) In particular, it is necessary to observe the failure caused by falling from a high place or due to lightning, power grid voltage, etc., and observe the component side and the wiring side.

(5) Some failure phenomena can be smelled. For example, if the electrolytic capacitor bursts, there will be an oily smell, the high voltage package will burn through the shell, there will be a burnt smell, and so on.

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Keywords: refrigerator repair, TV repair, air conditioning repair, gas stove repair
Copyright: Chuangying Electrical Maintenance Service Co., Ltd. Consulting Hotline: 400-6670-951
Address: Room 102, Building 2, No.7 Qingxiangliu, Duzheng Street, Dingwangtai Street, Furong District, Changsha City, Hunan Province
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