Often.
(2) If the above inspection is normal, measure whether the rectified and filtered voltage is positive.
Often.
③ Measure whether the voltage at the output end of the power factor correction circuit is positive.
Often.
④ Measure whether the output voltage of the auxiliary switching power supply circuit is positive.
Often.
⑤ Measure whether the on/standby voltage is normal and whether the standby control diode and other circuit elements are positive.
Often.
⑥ If all the above measurements are normal, if the power-on tester is still not turned on, then it is necessary to measure whether the voltage and output pins of all DC-DC voltage conversion circuit chips on the motherboard are normal. If there is any abnormality, just check the components around the abnormal pin of the chip.
Changhong TV boot black screen fault LCD TV boot black screen for a few minutes, there are several situations will appear this kind of fault:
1. There are electronic components with poor thermal stability in the TV circuit. After working for a period of time, they stop working with the increase of working temperature. This situation generally occurs in high-power devices and large-scale integrated circuits.
2. Virtual welding and desoldering of TV circuit board, because wave welding is used in TV production now, and there is little welding between circuit board and electronic components. In some places, because the components are very hot, virtual welding and desoldering will occur.
3. The circuit board of TV set is broken, which is also common, because all TV sets now use large-scale integrated circuits, and some circuit boards have very thin lines. When the TV bumps, the circuit board will break, the circuit board installation will be uneven, and the TV set will be uneven.
The failure of the TV set after working for a period of time is inseparable from the fever. First, the electronic components stop working due to heat. Second, the contact and fracture parts, when the circuit is disconnected due to thermal expansion and contraction, the TV can not continue to work normally, and can work again after shutdown and cooling.
Changhong TV LT 195 10 turns on the black screen LCD TV. Possible reasons:
1. LCD TV screen driver circuit has a fault caused by virtual welding.
2. There is something wrong with the power supply itself, which makes the power supply unable to start.
3. The circuit controlling the high voltage board switch on the TV advertising board is burnt out.
4. The backlight of TV screen is broken or other special circumstances.
5. First of all, it may be caused by abnormal power supply circuit, which shows that when the panel is pressed, the buttons do not respond and the indicator light does not light up. One possibility is that there is something wrong with the input stage of the power supply circuit; Another possibility is that the load of 5V is aggravated.
6. The set-top box is not turned on, resulting in no video output from the TV.
7. The signal source of TV switching is inconsistent with the video signal output by the set-top box.
How to start the black screen of Changhong TV? The power supply of the black screen machine is protected. If there is something wrong, it will be sent to be repaired.
What if Changhong TV shuts down after the indicator light flashes? If the indicator light flashes and the back is bright (LCD, LED models) but there is no display or prompt on the screen, it is recommended to go through after-sales service.
Or BBS or WeChat official account to get the latest firmware brush, which can restore the problem. Cause: It may be the root cause.
System files are damaged, or third-party applications, etc. If you can't resume using the computer after brushing, it should be a hardware problem, OK.
Carry out maintenance treatment.
Possible reasons:
1. The power supply system of the TV set is faulty, resulting in abnormal power supply and the screen cannot be lit.
2. The screen cannot be displayed due to the failure of the TV high-voltage package.
3. The failure of TV picture tube leads to black screen.
4. Black screen caused by internal circuit failure or other component failure of the TV.
5. Users are advised to contact the after-sales service of TV in time for TV hardware failure caused by black screen.
Conduct a comprehensive inspection and maintenance.
Using Caton's solution:
(1) It is recommended to install only your necessary applications. The redundant applications will occupy the system storage and affect the execution speed. If you need it, you should
If you use too much, you can go to the TV tube house to optimize the system and try to avoid too many applications being executed and guided in the background.
(2) In addition, the TV is used for a long time, and it will get stuck if it is cached too much. It is recommended that you do not save the application regularly.
Factory settings ",or brush slimming system.
(3) However, if only one application is stuck, please contact the development organization of the application or use other similar applications instead.
Apply.
Solution to abnormal screen color;
(1) It is recommended to open the homepage UI interface and all application interfaces to see if it is displayed like this. If it is a suggested phone with abnormal color display.
On-site inspection after sale.
(2) If the set-top box displays abnormally, it is recommended to contact the set-top box supplier for confirmation.
Changhong TV black screen 1. The TV switches to another signal source, which is inconsistent with the video signal output by the set-top box. Press the "Source" button of the TV remote control to switch to the video source consistent with the set-top box.
2, the set-top box is not turned on, resulting in no video and sound output, just turn on the set-top box.
3. The video circuit of the set-top box is abnormal, resulting in no video output. Check the video output circuit of the set-top box and repair it.
4. The video cable between the set-top box and the TV is not connected correctly. Reconnect the video cable between the set-top box and the TV.
5. The backlight of the TV screen is broken or under other special circumstances.
6. There is a virtual welding fault in the screen drive circuit inside the TV.
Changhong TV 32d2000n boot black screen directly contact after-sales.
What about the black screen after Changhong TV's expansion? 1. The system executes the out-of-memory method.
In daily life, the most common reason for Changhong TV's black screen is the lack of system execution memory. The background application is an application that has been started before, but when you are using other applications, it is still a part of the program executing in the background of the system because you have not quit the application. But with the increase of background applications, the memory of the system itself is getting smaller and smaller. After such a vicious circle, the system does not have enough space to perform subsequent functional operations, resulting in the software being unable to respond, which in turn leads to jamming, black screen, no response and so on.
Solution: For this kind of problem, the most direct solution is to restart the computer, or open the background cleaning software and close the unnecessary software at this stage, thus achieving the effect of releasing the system memory.
Second, the system execution software optimization is poor.
Poor system optimization is mainly reflected in whether there are too many unnecessary software on TV. Take Changhong TV as an example. In the original TV system, there are many applications that we don't need on TV. These applications will not be used in the normal use of the TV. However, because it is the software that comes with the remote system, most of them are set to start automatically, which will occupy a lot of system memory, thus affecting the execution speed and effect of TV.
Solution: If there are many useless native system applications, you can also try to get ROOT permission and clean up the system applications, but it should be noted here that not all applications can be deleted. Improper deletion and movement may cause system crash, so it needs to be used with caution.
Changhong TV has Changhong logo when it is turned on, and then there is no image black screen. First, measure whether the voltage at the output end of the main switching power supply circuit is normal.
② If the above measurement is normal, it means that the switching power supply circuit works normally, otherwise, check the switching power supply circuit.
③ Although all the above measurements are normal, the power-on tester is still out of order. In this case, measure whether the power supply voltage of the motherboard circuit is normal. If it is normal, measure whether the voltage and output pins of all DC-DC voltage conversion circuit chips on the motherboard are normal. If it is abnormal, just check the components around the abnormal pin of the chip.
What may be the reason for the black screen after Changhong TV is turned on? Check the power supply, circuit and power drive, and you should know what the reason is. If it doesn't work, let it go and be repaired by professionals. The problem is not big. Be sure to find professional maintenance to avoid being cheated! All right!