Sony TV KDL 55EX720 always looks at it for a while and then turns off the black screen

Dear users, hello.

The failure of a TV set with a sudden black screen is usually divided into three situations:

One is that the row part is not working;

The second is that the line part is not working normally, which causes X-ray protection or overvoltage, overcurrent protection and excessive current, so that the power supply can not work normally, and the third is that the line part has worked, but the power supply of the line output transformer forms a poor circuit and makes the whole machine show three nothing. If the power supply is normal and the line part is not working, first check whether the collector voltage of the line push tube is normal, and then focus on checking the line output part, usually after determining that the line output tube is normal, the inspection focus should be on the line output transformer and its periphery. If the collector voltage of the row pusher is abnormal, first eliminate the fault of the pusher itself, and then overhaul the row oscillation circuit.

In general, it is common to start an open circuit with a power supply resistor. For the three nos caused by the action of the protection circuit.

What the protective action should be determined should be determined first. The method is to disconnect each protective branch one by one to eliminate it, and then check it separately. For X-ray protection or overvoltage protection, focus on checking whether the line frequency is too low and whether the line counterpath capacitance becomes smaller, and for the overcurrent protection or current overpower, the power supply can not work normally, and the line output transformer and its load circuit should be checked.

As for the situation that the row part has been working and the three are not, it is relatively simple, mainly to check whether the high-voltage, medium-voltage and low-voltage power supply circuits are normal and whether the filament power supply is normal. This is often referred to as a "black screen".

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Take a look at the settings to see if there is a timer to shut down.

This situation will occur if the version is incompatible,It is the bug or incompatibility of the software itself、The bug of the system is recommended to install the sofa butler software,The sofa butler is the largest smart TV application market,There are a variety of cracked applications in it,Very good。

Sony TV KD-55X8500G suddenly black screen.

Dear, hello, I'm glad to answer for you: Sony TV KD-55X8500G suddenly black screen Answer: Pro, Sony TV black screen failure causes and solutions Question 1:

The 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. Answer 1: 1. Use a multimeter to measure the working points of each main power supply, whether the fuse is blown or not, if it is fused, disconnect the power supply, and use the resistance file to measure whether there is a short circuit at the main power supply working points.

2. If there is no short circuit, it can be repaired with reference to the white screen phenomenon to ensure that the voltage noise at each working point and the input and output of the signal are in normal working condition. Cause of Sony TV black screen failure Problem 2: If the motherboard is working normally, check the backlight board.

Answer 1: 1. Check whether the connection between the motherboard and the backlight board is in contact with the main good. 2. Use a multimeter to measure the voltage of the backlight, there should be a 12V power supply voltage, a switching voltage and a 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, check whether the output level of the MCU and the working state of the transistor are normal, pay attention to whether there is a short circuit, and replace the components if necessary.

3. The power supply is caused by the abnormal driving of the road, which is manifested as the button does not respond when pressing the panel, and the indicator light does not light up. First check whether the 12V voltage is normal, and then check the 5V voltage, because the working voltage of the chip in the signal processing part of the AD driver board is 5V, so when looking for the fault that cannot be turned on, first use the remaining key of the multimeter to measure the 5V voltage, if there is no 5V voltage or the 5V voltage becomes very low, then one possibility is that there is 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 5VSony (China) **** was established in Beijing in October 1996, It is a wholly-owned subsidiary of Sony Group that manages and coordinates Sony's business activities in China. As the regional headquarters in China, it is engaged in the investment of the electronic information industry in China, product marketing, customer after-sales service liaison, and macro management and extensive business support for Sony's affiliated enterprises in China, so as to promote the continuous development of Sony's business in the Chinese market.

Summary. Cause 1: If there is a problem with the high-voltage plate of the TV, the screen will go black when it is turned on.

Solution: If you want to solve the problem fundamentally, you need to replace the high-voltage plate.

Sony TV 55hx720 black screen after booting?

Cause 1: The problem of cavity residue on the high-voltage plate of the electric Wu Xun rolling machine will lead to the failure phenomenon of black screen when it is turned on. Solution: To fundamentally solve the problem, it is necessary to replace the high-voltage plate.

Cause 2: There is a problem with the power strip of the LCD TV, the voltage output of the power strip fluctuates, or the power strip works for too long, and the main power supply enters the protection state. Workaround:

It is recommended to replace the power board with a 24V8A or 10A power board with a common high-power spike source board to make the output voltage of the power board more stable. If it is a fault phenomenon that the machine cannot be turned on and the car light does not flash, most of it is caused by abnormal circuits.

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In the case of a Sony KD-55HX75 TV display failure, whether it can be fixed depends on the nature and extent of the specific problem. Generally speaking, if there are small problems such as dead pixels, blurred screens, and uneven brightness on the display, it may be possible to fix them. First, it's a good idea to try some simple troubleshooting steps, such as reconnecting your TV to the power cable, and checking if the HDMI cable or other cables are loose or damaged.

You can also try restoring your TV to factory settings or doing a software update to see if that fixes the issue. If none of the above works and the problem is indeed caused by the display itself, then it is usually not realistic to fix the display. The display is the core component of the TV, which is expensive to repair and requires experienced professional technicians to operate.

In most cases, the cost of repairs can outweigh the cost of buying a new TV**. Therefore, if your Sony KD-55HX75 TV display fails, it is recommended to contact the Sony after-sales service center for professional technical support and advice. They will be able to provide more specific repair recommendations and possible wide-track solutions, as well as information on how long and how much the repair will take. 

Hello dear,What's going on with the picture crash after Sony TV is turned on:1、It may be a crash problem。 2、Sony TV turns on and the screen goes black, but you don't need to move anything after the disadvantage, and it starts again**It's a problem of poor contact with the power cord3、Sony TV turns on and the screen goes black, and the main power supply or internal power supply is not turned on、The motherboard is damaged and other parts are damaged。

Solution: The solution to the crash problem is to force the shutdown and then turn on the cooling machine after half an hour, which can be solved. If maintenance, cleaning, and heat dissipation are not good, open the dust cover to clean up the dust.

Normal rental and shutdown, after cleaning the dust of the ear code, it will be turned on after three days. After that, pay attention to daily maintenance, clean up the dust, and ensure the normal operation of the machine. 2. Check whether the plug-in board and the power cord plug are not in good contact, if there is no problem, it is a problem with the power cord, and then test whether the screen will be black after replacing the power cord.

3. Check the main power supply, internal power supply and motherboard problems. Check whether the external power supply is normal,Whether the power supply board is normal,Whether the power cord is normal,If they are normal,You can judge that there may be damage to the internal power supply circuit of Sony TV,At this time, you need to repair the color TV and replace the internal power supply of the corresponding model。 4. If there is still sound or snowflakes and color bars after the black screen, the monitor screen is broken.

The inner display needs to be replaced. Try not to operate at home as much as possible, and it is best to find a professional maintenance master to operate at home.

Summary. Kiss! 1.

The TV is not connected to any external signal source, so the TV does not input any signal, so the screen saver (logo) will be activated to protect the screen. This is normal. 2.

If the TV is connected to an external signal source, the logo is displayed on the screen; It is caused by a mismatch between the current source mode of the TV and the input signal source of the TV. Solution: Just restore the factory settings.

Stupid! 1.The TV is not connected to any external signal source, so the TV does not input any signal, so the screen saver (logo) will be activated to protect the screen.

This is normal. 2.If the TV is connected to an external signal source, the logo will be displayed on the screen; It is because the current signal source mode of the TV is not matched with the signal source input of the TV.

Solution: Just restore the factory settings.

Kiss! The main reasons and solutions for the TV to stay on the boot screen after booting:1、There is a problem with the system of the TV, which causes the machine to get stuck and crash after booting and stay on the boot screen; You can turn off the power of the TV, stare at the ant and restart it, and it can generally return to normal after restarting.

If the boot still freezes after many attempts, you need to contact the service of the TV to arrange for a professional to come to the door to flash the new system into the new system for the car TV to solve the problem. 2. Television; If there is a problem with the hardware, it will also cause the boot to stay on the boot screen; If the TV still crashes when it is turned on after reflashing the system, it can be judged as a hardware failure of the TV, such as the motherboard chip, Kai Ma processor failure, memory failure, etc., and it is also necessary to contact the service of the TV to carry out a comprehensive overhaul of the TV, in order to solve the problem.

Hello,Here to help you understand1、It may be that there is sound on the black screen,Referred to as sound without picture,This fault is for the internal LED light-emitting diode inside the TV to burn out,Or part of the circuit fault of the power board。 2. If the indicator light is not on, this situation means that the power board is damaged, or some of the control circuits are abnormal. 3. The indicator light is red, and this situation is mostly TV standby.

Suggested processing method:1、First check whether the power supply of the TV is turned on,Or whether the power switch is on,Turn on the power of the TV。 2. Check whether you have pressed the power button of the remote control to turn off the screen of the TV so that the TV is in standby, and you can press the power button again to solve it.

3、Check whether the TV has entered the black screen protection mode because there is no signal input,Then check whether it is connected to the signal input of the TV unblocked,Then by pressing the signal source key of the remote control,Switch mode by mode,Such as TV mode、** mode、HDMI mode, etc.,There is still a black screen after the above methods are checked,It is generally the motherboard circuit of the TV or other device failure、Hardware failure such as screen failure。 4. Use a multimeter to measure the working points of each main power supply, whether the fuse is blown, if the fuse is broken, disconnect the power supply, measure whether there is a short circuit with the resistance gear, and carefully find out whether the wire and each related component is damaged if there is a short circuit.

Summary. 1、Sony TV fault red light flashes five times,It generally means that the display system of the TV is faulty,Troubleshooting and maintenance are required。 2. If it is a CRT TV, the picture tube is faulty, and you need to check whether the picture tube and tube socket are faulty, and if so, you need to replace the CRT and tube socket with a new one.

3. If it is an LCD TV, there is a problem with the display screen or cable, and it can be replaced after finding out the corresponding problem. 4. Non-professional users are advised to contact the after-sales service of the TV in time to conduct a comprehensive overhaul of the TV.

Sony TV KDL-46EX650 does not turn on and the light flashes 5 times.

Oooh. Can you tell us more about that?

1、Sony TV failure red light flashes five times,It generally means that the display system of the TV is faulty,Need to troubleshoot and repair。 2. If it is a CRT TV, the picture tube is faulty, and it is necessary to check whether the picture tube and tube socket are faulty, and if there is an orange check, you need to replace the picture tube and tube socket with a new one. 3. If it is an LCD TV, there is a problem with the display screen or cable, and it can be replaced after finding out the corresponding problem.

4. Non-professional users are advised to contact the after-sales service of the TV in time to conduct a comprehensive overhaul of the electric noisy visual machine.